ftrace: Synchronize the initialization of ftrace_opsgrafted

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

21 files changed, 12689 insertions, 0 deletions

diff --git a/security/tomoyo/.gitignore b/security/tomoyo/.gitignore
new file mode 100644
index 000000000..9f300cdce
--- /dev/null
+++ b/security/tomoyo/.gitignore
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+builtin-policy.h
+policy/*.conf
diff --git a/security/tomoyo/Kconfig b/security/tomoyo/Kconfig
new file mode 100644
index 000000000..1e0dd1a6d
--- /dev/null
+++ b/security/tomoyo/Kconfig
@@ -0,0 +1,85 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config SECURITY_TOMOYO
+	bool "TOMOYO Linux Support"
+	depends on SECURITY
+	depends on NET
+	select SECURITYFS
+	select SECURITY_PATH
+	select SECURITY_NETWORK
+	default n
+	help
+	  This selects TOMOYO Linux, pathname-based access control.
+	  Required userspace tools and further information may be
+	  found at <https://tomoyo.sourceforge.net/>.
+	  If you are unsure how to answer this question, answer N.
+
+config SECURITY_TOMOYO_MAX_ACCEPT_ENTRY
+	int "Default maximal count for learning mode"
+	default 2048
+	range 0 2147483647
+	depends on SECURITY_TOMOYO
+	help
+	  This is the default value for maximal ACL entries
+	  that are automatically appended into policy at "learning mode".
+	  Some programs access thousands of objects, so running
+	  such programs in "learning mode" dulls the system response
+	  and consumes much memory.
+	  This is the safeguard for such programs.
+
+config SECURITY_TOMOYO_MAX_AUDIT_LOG
+	int "Default maximal count for audit log"
+	default 1024
+	range 0 2147483647
+	depends on SECURITY_TOMOYO
+	help
+	  This is the default value for maximal entries for
+	  audit logs that the kernel can hold on memory.
+	  You can read the log via /sys/kernel/security/tomoyo/audit.
+	  If you don't need audit logs, you may set this value to 0.
+
+config SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
+	bool "Activate without calling userspace policy loader."
+	default n
+	depends on SECURITY_TOMOYO
+	help
+	  Say Y here if you want to activate access control as soon as built-in
+	  policy was loaded. This option will be useful for systems where
+	  operations which can lead to the hijacking of the boot sequence are
+	  needed before loading the policy. For example, you can activate
+	  immediately after loading the fixed part of policy which will allow
+	  only operations needed for mounting a partition which contains the
+	  variant part of policy and verifying (e.g. running GPG check) and
+	  loading the variant part of policy. Since you can start using
+	  enforcing mode from the beginning, you can reduce the possibility of
+	  hijacking the boot sequence.
+
+config SECURITY_TOMOYO_POLICY_LOADER
+	string "Location of userspace policy loader"
+	default "/sbin/tomoyo-init"
+	depends on SECURITY_TOMOYO
+	depends on !SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
+	help
+	  This is the default pathname of policy loader which is called before
+	  activation. You can override this setting via TOMOYO_loader= kernel
+	  command line option.
+
+config SECURITY_TOMOYO_ACTIVATION_TRIGGER
+	string "Trigger for calling userspace policy loader"
+	default "/sbin/init"
+	depends on SECURITY_TOMOYO
+	depends on !SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
+	help
+	  This is the default pathname of activation trigger.
+	  You can override this setting via TOMOYO_trigger= kernel command line
+	  option. For example, if you pass init=/bin/systemd option, you may
+	  want to also pass TOMOYO_trigger=/bin/systemd option.
+
+config SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
+	bool "Use insecure built-in settings for fuzzing tests."
+	default n
+	depends on SECURITY_TOMOYO
+	select SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
+	help
+	  Enabling this option forces minimal built-in policy and disables
+	  domain/program checks for run-time policy modifications. Please enable
+	  this option only if this kernel is built for doing fuzzing tests.
diff --git a/security/tomoyo/Makefile b/security/tomoyo/Makefile
new file mode 100644
index 000000000..e3c0f853a
--- /dev/null
+++ b/security/tomoyo/Makefile
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0
+CONTEXT_ANALYSIS := y
+
+obj-y = audit.o common.o condition.o domain.o environ.o file.o gc.o group.o load_policy.o memory.o mount.o network.o realpath.o securityfs_if.o tomoyo.o util.o
+
+targets += builtin-policy.h
+
+quiet_cmd_policy = POLICY  $@
+      cmd_policy = { \
+	$(foreach x, profile exception_policy domain_policy manager stat, \
+	printf 'static char tomoyo_builtin_$x[] __initdata =\n'; \
+	sed -e 's/\\/\\\\/g' -e 's/\"/\\"/g' -e 's/\(.*\)/\t"\1\\n"/' -- $(firstword $(filter %/$x.conf %/$x.conf.default, $^) /dev/null);  \
+	printf '\t"";\n';) \
+	} > $@
+
+$(obj)/builtin-policy.h: $(wildcard $(obj)/policy/*.conf $(src)/policy/*.conf.default) FORCE
+	$(call if_changed,policy)
+
+ifndef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
+$(obj)/common.o: $(obj)/builtin-policy.h
+endif
diff --git a/security/tomoyo/audit.c b/security/tomoyo/audit.c
new file mode 100644
index 000000000..1fba46aa3
--- /dev/null
+++ b/security/tomoyo/audit.c
@@ -0,0 +1,477 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/audit.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include "common.h"
+#include <linux/slab.h>
+
+/**
+ * tomoyo_print_bprm - Print "struct linux_binprm" for auditing.
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ * @dump: Pointer to "struct tomoyo_page_dump".
+ *
+ * Returns the contents of @bprm on success, NULL otherwise.
+ *
+ * This function uses kzalloc(), so caller must kfree() if this function
+ * didn't return NULL.
+ */
+static char *tomoyo_print_bprm(struct linux_binprm *bprm,
+			       struct tomoyo_page_dump *dump)
+{
+	static const int tomoyo_buffer_len = 4096 * 2;
+	char *buffer = kzalloc(tomoyo_buffer_len, GFP_NOFS);
+	char *cp;
+	char *last_start;
+	int len;
+	unsigned long pos = bprm->p;
+	int offset = pos % PAGE_SIZE;
+	int argv_count = bprm->argc;
+	int envp_count = bprm->envc;
+	bool truncated = false;
+
+	if (!buffer)
+		return NULL;
+	len = snprintf(buffer, tomoyo_buffer_len - 1, "argv[]={ ");
+	cp = buffer + len;
+	if (!argv_count) {
+		memmove(cp, "} envp[]={ ", 11);
+		cp += 11;
+	}
+	last_start = cp;
+	while (argv_count || envp_count) {
+		if (!tomoyo_dump_page(bprm, pos, dump))
+			goto out;
+		pos += PAGE_SIZE - offset;
+		/* Read. */
+		while (offset < PAGE_SIZE) {
+			const char *kaddr = dump->data;
+			const unsigned char c = kaddr[offset++];
+
+			if (cp == last_start)
+				*cp++ = '"';
+			if (cp >= buffer + tomoyo_buffer_len - 32) {
+				/* Reserve some room for "..." string. */
+				truncated = true;
+			} else if (c == '\\') {
+				*cp++ = '\\';
+				*cp++ = '\\';
+			} else if (c > ' ' && c < 127) {
+				*cp++ = c;
+			} else if (!c) {
+				*cp++ = '"';
+				*cp++ = ' ';
+				last_start = cp;
+			} else {
+				*cp++ = '\\';
+				*cp++ = (c >> 6) + '0';
+				*cp++ = ((c >> 3) & 7) + '0';
+				*cp++ = (c & 7) + '0';
+			}
+			if (c)
+				continue;
+			if (argv_count) {
+				if (--argv_count == 0) {
+					if (truncated) {
+						cp = last_start;
+						memmove(cp, "... ", 4);
+						cp += 4;
+					}
+					memmove(cp, "} envp[]={ ", 11);
+					cp += 11;
+					last_start = cp;
+					truncated = false;
+				}
+			} else if (envp_count) {
+				if (--envp_count == 0) {
+					if (truncated) {
+						cp = last_start;
+						memmove(cp, "... ", 4);
+						cp += 4;
+					}
+				}
+			}
+			if (!argv_count && !envp_count)
+				break;
+		}
+		offset = 0;
+	}
+	*cp++ = '}';
+	*cp = '\0';
+	return buffer;
+out:
+	snprintf(buffer, tomoyo_buffer_len - 1,
+		 "argv[]={ ... } envp[]= { ... }");
+	return buffer;
+}
+
+/**
+ * tomoyo_filetype - Get string representation of file type.
+ *
+ * @mode: Mode value for stat().
+ *
+ * Returns file type string.
+ */
+static inline const char *tomoyo_filetype(const umode_t mode)
+{
+	switch (mode & S_IFMT) {
+	case S_IFREG:
+	case 0:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FILE];
+	case S_IFDIR:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_DIRECTORY];
+	case S_IFLNK:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SYMLINK];
+	case S_IFIFO:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FIFO];
+	case S_IFSOCK:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SOCKET];
+	case S_IFBLK:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_BLOCK_DEV];
+	case S_IFCHR:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_CHAR_DEV];
+	}
+	return "unknown"; /* This should not happen. */
+}
+
+/**
+ * tomoyo_print_header - Get header line of audit log.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns string representation.
+ *
+ * This function uses kmalloc(), so caller must kfree() if this function
+ * didn't return NULL.
+ */
+static char *tomoyo_print_header(struct tomoyo_request_info *r)
+{
+	struct tomoyo_time stamp;
+	const pid_t gpid = task_pid_nr(current);
+	struct tomoyo_obj_info *obj = r->obj;
+	static const int tomoyo_buffer_len = 4096;
+	char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
+	int pos;
+	u8 i;
+
+	if (!buffer)
+		return NULL;
+
+	tomoyo_convert_time(ktime_get_real_seconds(), &stamp);
+
+	pos = snprintf(buffer, tomoyo_buffer_len - 1,
+		       "#%04u/%02u/%02u %02u:%02u:%02u# profile=%u mode=%s granted=%s (global-pid=%u) task={ pid=%u ppid=%u uid=%u gid=%u euid=%u egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
+		       stamp.year, stamp.month, stamp.day, stamp.hour,
+		       stamp.min, stamp.sec, r->profile, tomoyo_mode[r->mode],
+		       str_yes_no(r->granted), gpid, tomoyo_sys_getpid(),
+		       tomoyo_sys_getppid(),
+		       from_kuid(&init_user_ns, current_uid()),
+		       from_kgid(&init_user_ns, current_gid()),
+		       from_kuid(&init_user_ns, current_euid()),
+		       from_kgid(&init_user_ns, current_egid()),
+		       from_kuid(&init_user_ns, current_suid()),
+		       from_kgid(&init_user_ns, current_sgid()),
+		       from_kuid(&init_user_ns, current_fsuid()),
+		       from_kgid(&init_user_ns, current_fsgid()));
+	if (!obj)
+		goto no_obj_info;
+	if (!obj->validate_done) {
+		tomoyo_get_attributes(obj);
+		obj->validate_done = true;
+	}
+	for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
+		struct tomoyo_mini_stat *stat;
+		unsigned int dev;
+		umode_t mode;
+
+		if (!obj->stat_valid[i])
+			continue;
+		stat = &obj->stat[i];
+		dev = stat->dev;
+		mode = stat->mode;
+		if (i & 1) {
+			pos += snprintf(buffer + pos,
+					tomoyo_buffer_len - 1 - pos,
+					" path%u.parent={ uid=%u gid=%u ino=%llu perm=0%o }",
+					(i >> 1) + 1,
+					from_kuid(&init_user_ns, stat->uid),
+					from_kgid(&init_user_ns, stat->gid),
+					stat->ino, stat->mode & S_IALLUGO);
+			continue;
+		}
+		pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
+				" path%u={ uid=%u gid=%u ino=%llu major=%u minor=%u perm=0%o type=%s",
+				(i >> 1) + 1,
+				from_kuid(&init_user_ns, stat->uid),
+				from_kgid(&init_user_ns, stat->gid),
+				stat->ino, MAJOR(dev), MINOR(dev),
+				mode & S_IALLUGO, tomoyo_filetype(mode));
+		if (S_ISCHR(mode) || S_ISBLK(mode)) {
+			dev = stat->rdev;
+			pos += snprintf(buffer + pos,
+					tomoyo_buffer_len - 1 - pos,
+					" dev_major=%u dev_minor=%u",
+					MAJOR(dev), MINOR(dev));
+		}
+		pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
+				" }");
+	}
+no_obj_info:
+	if (pos < tomoyo_buffer_len - 1)
+		return buffer;
+	kfree(buffer);
+	return NULL;
+}
+
+/**
+ * tomoyo_init_log - Allocate buffer for audit logs.
+ *
+ * @r:    Pointer to "struct tomoyo_request_info".
+ * @len:  Buffer size needed for @fmt and @args.
+ * @fmt:  The printf()'s format string.
+ * @args: va_list structure for @fmt.
+ *
+ * Returns pointer to allocated memory.
+ *
+ * This function uses kzalloc(), so caller must kfree() if this function
+ * didn't return NULL.
+ */
+char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
+		      va_list args)
+{
+	char *buf = NULL;
+	char *bprm_info = NULL;
+	const char *header = NULL;
+	char *realpath = NULL;
+	const char *symlink = NULL;
+	int pos;
+	const char *domainname = r->domain->domainname->name;
+
+	header = tomoyo_print_header(r);
+	if (!header)
+		return NULL;
+	/* +10 is for '\n' etc. and '\0'. */
+	len += strlen(domainname) + strlen(header) + 10;
+	if (r->ee) {
+		struct file *file = r->ee->bprm->file;
+
+		realpath = tomoyo_realpath_from_path(&file->f_path);
+		bprm_info = tomoyo_print_bprm(r->ee->bprm, &r->ee->dump);
+		if (!realpath || !bprm_info)
+			goto out;
+		/* +80 is for " exec={ realpath=\"%s\" argc=%d envc=%d %s }" */
+		len += strlen(realpath) + 80 + strlen(bprm_info);
+	} else if (r->obj && r->obj->symlink_target) {
+		symlink = r->obj->symlink_target->name;
+		/* +18 is for " symlink.target=\"%s\"" */
+		len += 18 + strlen(symlink);
+	}
+	len = kmalloc_size_roundup(len);
+	buf = kzalloc(len, GFP_NOFS);
+	if (!buf)
+		goto out;
+	len--;
+	pos = snprintf(buf, len, "%s", header);
+	if (realpath) {
+		struct linux_binprm *bprm = r->ee->bprm;
+
+		pos += snprintf(buf + pos, len - pos,
+				" exec={ realpath=\"%s\" argc=%d envc=%d %s }",
+				realpath, bprm->argc, bprm->envc, bprm_info);
+	} else if (symlink)
+		pos += snprintf(buf + pos, len - pos, " symlink.target=\"%s\"",
+				symlink);
+	pos += snprintf(buf + pos, len - pos, "\n%s\n", domainname);
+	vsnprintf(buf + pos, len - pos, fmt, args);
+out:
+	kfree(realpath);
+	kfree(bprm_info);
+	kfree(header);
+	return buf;
+}
+
+/* Wait queue for /sys/kernel/security/tomoyo/audit. */
+static DECLARE_WAIT_QUEUE_HEAD(tomoyo_log_wait);
+
+/* Structure for audit log. */
+struct tomoyo_log {
+	struct list_head list;
+	char *log;
+	int size;
+};
+
+/* The list for "struct tomoyo_log". */
+static LIST_HEAD(tomoyo_log);
+
+/* Lock for "struct list_head tomoyo_log". */
+static DEFINE_SPINLOCK(tomoyo_log_lock);
+
+/* Length of "struct list_head tomoyo_log". */
+static unsigned int tomoyo_log_count;
+
+/**
+ * tomoyo_get_audit - Get audit mode.
+ *
+ * @ns:          Pointer to "struct tomoyo_policy_namespace".
+ * @profile:     Profile number.
+ * @index:       Index number of functionality.
+ * @matched_acl: Pointer to "struct tomoyo_acl_info".
+ * @is_granted:  True if granted log, false otherwise.
+ *
+ * Returns true if this request should be audited, false otherwise.
+ */
+static bool tomoyo_get_audit(const struct tomoyo_policy_namespace *ns,
+			     const u8 profile, const u8 index,
+			     const struct tomoyo_acl_info *matched_acl,
+			     const bool is_granted)
+{
+	u8 mode;
+	const u8 category = tomoyo_index2category[index] +
+		TOMOYO_MAX_MAC_INDEX;
+	struct tomoyo_profile *p;
+
+	if (!tomoyo_policy_loaded)
+		return false;
+	p = tomoyo_profile(ns, profile);
+	if (tomoyo_log_count >= p->pref[TOMOYO_PREF_MAX_AUDIT_LOG])
+		return false;
+	if (is_granted && matched_acl && matched_acl->cond &&
+	    matched_acl->cond->grant_log != TOMOYO_GRANTLOG_AUTO)
+		return matched_acl->cond->grant_log == TOMOYO_GRANTLOG_YES;
+	mode = p->config[index];
+	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+		mode = p->config[category];
+	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+		mode = p->default_config;
+	if (is_granted)
+		return mode & TOMOYO_CONFIG_WANT_GRANT_LOG;
+	return mode & TOMOYO_CONFIG_WANT_REJECT_LOG;
+}
+
+/**
+ * tomoyo_write_log2 - Write an audit log.
+ *
+ * @r:    Pointer to "struct tomoyo_request_info".
+ * @len:  Buffer size needed for @fmt and @args.
+ * @fmt:  The printf()'s format string.
+ * @args: va_list structure for @fmt.
+ *
+ * Returns nothing.
+ */
+void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
+		       va_list args)
+{
+	char *buf;
+	struct tomoyo_log *entry;
+	bool quota_exceeded = false;
+
+	if (!tomoyo_get_audit(r->domain->ns, r->profile, r->type,
+			      r->matched_acl, r->granted))
+		goto out;
+	buf = tomoyo_init_log(r, len, fmt, args);
+	if (!buf)
+		goto out;
+	entry = kzalloc_obj(*entry, GFP_NOFS);
+	if (!entry) {
+		kfree(buf);
+		goto out;
+	}
+	entry->log = buf;
+	len = kmalloc_size_roundup(strlen(buf) + 1);
+	/*
+	 * The entry->size is used for memory quota checks.
+	 * Don't go beyond strlen(entry->log).
+	 */
+	entry->size = len + kmalloc_size_roundup(sizeof(*entry));
+	spin_lock(&tomoyo_log_lock);
+	if (tomoyo_memory_quota[TOMOYO_MEMORY_AUDIT] &&
+	    tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] + entry->size >=
+	    tomoyo_memory_quota[TOMOYO_MEMORY_AUDIT]) {
+		quota_exceeded = true;
+	} else {
+		tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] += entry->size;
+		list_add_tail(&entry->list, &tomoyo_log);
+		tomoyo_log_count++;
+	}
+	spin_unlock(&tomoyo_log_lock);
+	if (quota_exceeded) {
+		kfree(buf);
+		kfree(entry);
+		goto out;
+	}
+	wake_up(&tomoyo_log_wait);
+out:
+	return;
+}
+
+/**
+ * tomoyo_write_log - Write an audit log.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @fmt: The printf()'s format string, followed by parameters.
+ *
+ * Returns nothing.
+ */
+void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...)
+{
+	va_list args;
+	int len;
+
+	va_start(args, fmt);
+	len = vsnprintf(NULL, 0, fmt, args) + 1;
+	va_end(args);
+	va_start(args, fmt);
+	tomoyo_write_log2(r, len, fmt, args);
+	va_end(args);
+}
+
+/**
+ * tomoyo_read_log - Read an audit log.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+void tomoyo_read_log(struct tomoyo_io_buffer *head)
+{
+	struct tomoyo_log *ptr = NULL;
+
+	if (head->r.w_pos)
+		return;
+	kfree(head->read_buf);
+	head->read_buf = NULL;
+	spin_lock(&tomoyo_log_lock);
+	if (!list_empty(&tomoyo_log)) {
+		ptr = list_entry(tomoyo_log.next, typeof(*ptr), list);
+		list_del(&ptr->list);
+		tomoyo_log_count--;
+		tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] -= ptr->size;
+	}
+	spin_unlock(&tomoyo_log_lock);
+	if (ptr) {
+		head->read_buf = ptr->log;
+		head->r.w[head->r.w_pos++] = head->read_buf;
+		kfree(ptr);
+	}
+}
+
+/**
+ * tomoyo_poll_log - Wait for an audit log.
+ *
+ * @file: Pointer to "struct file".
+ * @wait: Pointer to "poll_table". Maybe NULL.
+ *
+ * Returns EPOLLIN | EPOLLRDNORM when ready to read an audit log.
+ */
+__poll_t tomoyo_poll_log(struct file *file, poll_table *wait)
+{
+	if (tomoyo_log_count)
+		return EPOLLIN | EPOLLRDNORM;
+	poll_wait(file, &tomoyo_log_wait, wait);
+	if (tomoyo_log_count)
+		return EPOLLIN | EPOLLRDNORM;
+	return 0;
+}
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
new file mode 100644
index 000000000..fdaeaff01
--- /dev/null
+++ b/security/tomoyo/common.c
@@ -0,0 +1,3025 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/common.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/security.h>
+#include <linux/string_helpers.h>
+#include "common.h"
+
+/* String table for operation mode. */
+const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
+	[TOMOYO_CONFIG_DISABLED]   = "disabled",
+	[TOMOYO_CONFIG_LEARNING]   = "learning",
+	[TOMOYO_CONFIG_PERMISSIVE] = "permissive",
+	[TOMOYO_CONFIG_ENFORCING]  = "enforcing"
+};
+
+/* String table for /sys/kernel/security/tomoyo/profile */
+const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
+				       + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
+	/* CONFIG::file group */
+	[TOMOYO_MAC_FILE_EXECUTE]    = "execute",
+	[TOMOYO_MAC_FILE_OPEN]       = "open",
+	[TOMOYO_MAC_FILE_CREATE]     = "create",
+	[TOMOYO_MAC_FILE_UNLINK]     = "unlink",
+	[TOMOYO_MAC_FILE_GETATTR]    = "getattr",
+	[TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
+	[TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
+	[TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
+	[TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
+	[TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
+	[TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
+	[TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
+	[TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
+	[TOMOYO_MAC_FILE_LINK]       = "link",
+	[TOMOYO_MAC_FILE_RENAME]     = "rename",
+	[TOMOYO_MAC_FILE_CHMOD]      = "chmod",
+	[TOMOYO_MAC_FILE_CHOWN]      = "chown",
+	[TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
+	[TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
+	[TOMOYO_MAC_FILE_CHROOT]     = "chroot",
+	[TOMOYO_MAC_FILE_MOUNT]      = "mount",
+	[TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
+	[TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
+	/* CONFIG::network group */
+	[TOMOYO_MAC_NETWORK_INET_STREAM_BIND]       = "inet_stream_bind",
+	[TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN]     = "inet_stream_listen",
+	[TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT]    = "inet_stream_connect",
+	[TOMOYO_MAC_NETWORK_INET_DGRAM_BIND]        = "inet_dgram_bind",
+	[TOMOYO_MAC_NETWORK_INET_DGRAM_SEND]        = "inet_dgram_send",
+	[TOMOYO_MAC_NETWORK_INET_RAW_BIND]          = "inet_raw_bind",
+	[TOMOYO_MAC_NETWORK_INET_RAW_SEND]          = "inet_raw_send",
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND]       = "unix_stream_bind",
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN]     = "unix_stream_listen",
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT]    = "unix_stream_connect",
+	[TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND]        = "unix_dgram_bind",
+	[TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND]        = "unix_dgram_send",
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND]    = "unix_seqpacket_bind",
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN]  = "unix_seqpacket_listen",
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
+	/* CONFIG::misc group */
+	[TOMOYO_MAC_ENVIRON] = "env",
+	/* CONFIG group */
+	[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
+	[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
+	[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
+};
+
+/* String table for conditions. */
+const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
+	[TOMOYO_TASK_UID]             = "task.uid",
+	[TOMOYO_TASK_EUID]            = "task.euid",
+	[TOMOYO_TASK_SUID]            = "task.suid",
+	[TOMOYO_TASK_FSUID]           = "task.fsuid",
+	[TOMOYO_TASK_GID]             = "task.gid",
+	[TOMOYO_TASK_EGID]            = "task.egid",
+	[TOMOYO_TASK_SGID]            = "task.sgid",
+	[TOMOYO_TASK_FSGID]           = "task.fsgid",
+	[TOMOYO_TASK_PID]             = "task.pid",
+	[TOMOYO_TASK_PPID]            = "task.ppid",
+	[TOMOYO_EXEC_ARGC]            = "exec.argc",
+	[TOMOYO_EXEC_ENVC]            = "exec.envc",
+	[TOMOYO_TYPE_IS_SOCKET]       = "socket",
+	[TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
+	[TOMOYO_TYPE_IS_FILE]         = "file",
+	[TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
+	[TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
+	[TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
+	[TOMOYO_TYPE_IS_FIFO]         = "fifo",
+	[TOMOYO_MODE_SETUID]          = "setuid",
+	[TOMOYO_MODE_SETGID]          = "setgid",
+	[TOMOYO_MODE_STICKY]          = "sticky",
+	[TOMOYO_MODE_OWNER_READ]      = "owner_read",
+	[TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
+	[TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
+	[TOMOYO_MODE_GROUP_READ]      = "group_read",
+	[TOMOYO_MODE_GROUP_WRITE]     = "group_write",
+	[TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
+	[TOMOYO_MODE_OTHERS_READ]     = "others_read",
+	[TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
+	[TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
+	[TOMOYO_EXEC_REALPATH]        = "exec.realpath",
+	[TOMOYO_SYMLINK_TARGET]       = "symlink.target",
+	[TOMOYO_PATH1_UID]            = "path1.uid",
+	[TOMOYO_PATH1_GID]            = "path1.gid",
+	[TOMOYO_PATH1_INO]            = "path1.ino",
+	[TOMOYO_PATH1_MAJOR]          = "path1.major",
+	[TOMOYO_PATH1_MINOR]          = "path1.minor",
+	[TOMOYO_PATH1_PERM]           = "path1.perm",
+	[TOMOYO_PATH1_TYPE]           = "path1.type",
+	[TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
+	[TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
+	[TOMOYO_PATH2_UID]            = "path2.uid",
+	[TOMOYO_PATH2_GID]            = "path2.gid",
+	[TOMOYO_PATH2_INO]            = "path2.ino",
+	[TOMOYO_PATH2_MAJOR]          = "path2.major",
+	[TOMOYO_PATH2_MINOR]          = "path2.minor",
+	[TOMOYO_PATH2_PERM]           = "path2.perm",
+	[TOMOYO_PATH2_TYPE]           = "path2.type",
+	[TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
+	[TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
+	[TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
+	[TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
+	[TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
+	[TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
+	[TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
+	[TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
+	[TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
+	[TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
+};
+
+/* String table for PREFERENCE keyword. */
+static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
+	[TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
+	[TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
+};
+
+/* String table for path operation. */
+const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
+	[TOMOYO_TYPE_EXECUTE]    = "execute",
+	[TOMOYO_TYPE_READ]       = "read",
+	[TOMOYO_TYPE_WRITE]      = "write",
+	[TOMOYO_TYPE_APPEND]     = "append",
+	[TOMOYO_TYPE_UNLINK]     = "unlink",
+	[TOMOYO_TYPE_GETATTR]    = "getattr",
+	[TOMOYO_TYPE_RMDIR]      = "rmdir",
+	[TOMOYO_TYPE_TRUNCATE]   = "truncate",
+	[TOMOYO_TYPE_SYMLINK]    = "symlink",
+	[TOMOYO_TYPE_CHROOT]     = "chroot",
+	[TOMOYO_TYPE_UMOUNT]     = "unmount",
+};
+
+/* String table for socket's operation. */
+const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
+	[TOMOYO_NETWORK_BIND]    = "bind",
+	[TOMOYO_NETWORK_LISTEN]  = "listen",
+	[TOMOYO_NETWORK_CONNECT] = "connect",
+	[TOMOYO_NETWORK_SEND]    = "send",
+};
+
+/* String table for categories. */
+static const char * const tomoyo_category_keywords
+[TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
+	[TOMOYO_MAC_CATEGORY_FILE]    = "file",
+	[TOMOYO_MAC_CATEGORY_NETWORK] = "network",
+	[TOMOYO_MAC_CATEGORY_MISC]    = "misc",
+};
+
+/* Permit policy management by non-root user? */
+static bool tomoyo_manage_by_non_root;
+
+/* Utility functions. */
+
+/**
+ * tomoyo_addprintf - strncat()-like-snprintf().
+ *
+ * @buffer: Buffer to write to. Must be '\0'-terminated.
+ * @len:    Size of @buffer.
+ * @fmt:    The printf()'s format string, followed by parameters.
+ *
+ * Returns nothing.
+ */
+__printf(3, 4)
+static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
+{
+	va_list args;
+	const int pos = strlen(buffer);
+
+	va_start(args, fmt);
+	vsnprintf(buffer + pos, len - pos - 1, fmt, args);
+	va_end(args);
+}
+
+/**
+ * tomoyo_flush - Flush queued string to userspace's buffer.
+ *
+ * @head:   Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns true if all data was flushed, false otherwise.
+ */
+static bool tomoyo_flush(struct tomoyo_io_buffer *head)
+{
+	while (head->r.w_pos) {
+		const char *w = head->r.w[0];
+		size_t len = strlen(w);
+
+		if (len) {
+			if (len > head->read_user_buf_avail)
+				len = head->read_user_buf_avail;
+			if (!len)
+				return false;
+			if (copy_to_user(head->read_user_buf, w, len))
+				return false;
+			head->read_user_buf_avail -= len;
+			head->read_user_buf += len;
+			w += len;
+		}
+		head->r.w[0] = w;
+		if (*w)
+			return false;
+		/* Add '\0' for audit logs and query. */
+		if (head->poll) {
+			if (!head->read_user_buf_avail ||
+			    copy_to_user(head->read_user_buf, "", 1))
+				return false;
+			head->read_user_buf_avail--;
+			head->read_user_buf++;
+		}
+		head->r.w_pos--;
+		for (len = 0; len < head->r.w_pos; len++)
+			head->r.w[len] = head->r.w[len + 1];
+	}
+	head->r.avail = 0;
+	return true;
+}
+
+/**
+ * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
+ *
+ * @head:   Pointer to "struct tomoyo_io_buffer".
+ * @string: String to print.
+ *
+ * Note that @string has to be kept valid until @head is kfree()d.
+ * This means that char[] allocated on stack memory cannot be passed to
+ * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
+ */
+static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
+{
+	if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
+		head->r.w[head->r.w_pos++] = string;
+		tomoyo_flush(head);
+	} else
+		WARN_ON(1);
+}
+
+static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
+			     ...) __printf(2, 3);
+
+/**
+ * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @fmt:  The printf()'s format string, followed by parameters.
+ */
+static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
+			     ...)
+	__must_hold(&head->io_sem)
+{
+	va_list args;
+	size_t len;
+	size_t pos = head->r.avail;
+	int size = head->readbuf_size - pos;
+
+	if (size <= 0)
+		return;
+	va_start(args, fmt);
+	len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
+	va_end(args);
+	if (pos + len >= head->readbuf_size) {
+		WARN_ON(1);
+		return;
+	}
+	head->r.avail += len;
+	tomoyo_set_string(head, head->read_buf + pos);
+}
+
+/**
+ * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_set_space(struct tomoyo_io_buffer *head)
+{
+	tomoyo_set_string(head, " ");
+}
+
+/**
+ * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
+{
+	tomoyo_set_string(head, "\n");
+	return !head->r.w_pos;
+}
+
+/**
+ * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
+{
+	tomoyo_set_string(head, "/");
+}
+
+/* List of namespaces. */
+LIST_HEAD(tomoyo_namespace_list);
+/* True if namespace other than tomoyo_kernel_namespace is defined. */
+static bool tomoyo_namespace_enabled;
+
+/**
+ * tomoyo_init_policy_namespace - Initialize namespace.
+ *
+ * @ns: Pointer to "struct tomoyo_policy_namespace".
+ *
+ * Returns nothing.
+ */
+void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
+{
+	unsigned int idx;
+
+	for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
+		INIT_LIST_HEAD(&ns->acl_group[idx]);
+	for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
+		INIT_LIST_HEAD(&ns->group_list[idx]);
+	for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
+		INIT_LIST_HEAD(&ns->policy_list[idx]);
+	ns->profile_version = 20150505;
+	tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
+	list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
+}
+
+/**
+ * tomoyo_print_namespace - Print namespace header.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
+{
+	if (!tomoyo_namespace_enabled)
+		return;
+	tomoyo_set_string(head,
+			  container_of(head->r.ns,
+				       struct tomoyo_policy_namespace,
+				       namespace_list)->name);
+	tomoyo_set_space(head);
+}
+
+/**
+ * tomoyo_print_name_union - Print a tomoyo_name_union.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr:  Pointer to "struct tomoyo_name_union".
+ */
+static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
+				    const struct tomoyo_name_union *ptr)
+{
+	tomoyo_set_space(head);
+	if (ptr->group) {
+		tomoyo_set_string(head, "@");
+		tomoyo_set_string(head, ptr->group->group_name->name);
+	} else {
+		tomoyo_set_string(head, ptr->filename->name);
+	}
+}
+
+/**
+ * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr:  Pointer to "struct tomoyo_name_union".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
+					   const struct tomoyo_name_union *ptr)
+{
+	if (ptr->group) {
+		tomoyo_set_string(head, "@");
+		tomoyo_set_string(head, ptr->group->group_name->name);
+	} else {
+		tomoyo_set_string(head, "\"");
+		tomoyo_set_string(head, ptr->filename->name);
+		tomoyo_set_string(head, "\"");
+	}
+}
+
+/**
+ * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr:  Pointer to "struct tomoyo_number_union".
+ *
+ * Returns nothing.
+ */
+static void
+tomoyo_print_number_union_nospace(struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
+	__must_hold(&head->io_sem)
+{
+	if (ptr->group) {
+		tomoyo_set_string(head, "@");
+		tomoyo_set_string(head, ptr->group->group_name->name);
+	} else {
+		int i;
+		unsigned long min = ptr->values[0];
+		const unsigned long max = ptr->values[1];
+		u8 min_type = ptr->value_type[0];
+		const u8 max_type = ptr->value_type[1];
+		char buffer[128];
+
+		buffer[0] = '\0';
+		for (i = 0; i < 2; i++) {
+			switch (min_type) {
+			case TOMOYO_VALUE_TYPE_HEXADECIMAL:
+				tomoyo_addprintf(buffer, sizeof(buffer),
+						 "0x%lX", min);
+				break;
+			case TOMOYO_VALUE_TYPE_OCTAL:
+				tomoyo_addprintf(buffer, sizeof(buffer),
+						 "0%lo", min);
+				break;
+			default:
+				tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
+						 min);
+				break;
+			}
+			if (min == max && min_type == max_type)
+				break;
+			tomoyo_addprintf(buffer, sizeof(buffer), "-");
+			min_type = max_type;
+			min = max;
+		}
+		tomoyo_io_printf(head, "%s", buffer);
+	}
+}
+
+/**
+ * tomoyo_print_number_union - Print a tomoyo_number_union.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr:  Pointer to "struct tomoyo_number_union".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
+				      const struct tomoyo_number_union *ptr)
+	__must_hold(&head->io_sem)
+{
+	tomoyo_set_space(head);
+	tomoyo_print_number_union_nospace(head, ptr);
+}
+
+/**
+ * tomoyo_assign_profile - Create a new profile.
+ *
+ * @ns:      Pointer to "struct tomoyo_policy_namespace".
+ * @profile: Profile number to create.
+ *
+ * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
+ */
+static struct tomoyo_profile *tomoyo_assign_profile
+(struct tomoyo_policy_namespace *ns, const unsigned int profile)
+{
+	struct tomoyo_profile *ptr;
+	struct tomoyo_profile *entry;
+
+	if (profile >= TOMOYO_MAX_PROFILES)
+		return NULL;
+	ptr = ns->profile_ptr[profile];
+	if (ptr)
+		return ptr;
+	entry = kzalloc_obj(*entry, GFP_NOFS | __GFP_NOWARN);
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		goto out;
+	ptr = ns->profile_ptr[profile];
+	if (!ptr && tomoyo_memory_ok(entry)) {
+		ptr = entry;
+		ptr->default_config = TOMOYO_CONFIG_DISABLED |
+			TOMOYO_CONFIG_WANT_GRANT_LOG |
+			TOMOYO_CONFIG_WANT_REJECT_LOG;
+		memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
+		       sizeof(ptr->config));
+		ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
+			CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
+		ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
+			CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
+		mb(); /* Avoid out-of-order execution. */
+		ns->profile_ptr[profile] = ptr;
+		entry = NULL;
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+ out:
+	kfree(entry);
+	return ptr;
+}
+
+/**
+ * tomoyo_profile - Find a profile.
+ *
+ * @ns:      Pointer to "struct tomoyo_policy_namespace".
+ * @profile: Profile number to find.
+ *
+ * Returns pointer to "struct tomoyo_profile".
+ */
+struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
+				      const u8 profile)
+{
+	static struct tomoyo_profile tomoyo_null_profile;
+	struct tomoyo_profile *ptr = ns->profile_ptr[profile];
+
+	if (!ptr)
+		ptr = &tomoyo_null_profile;
+	return ptr;
+}
+
+/**
+ * tomoyo_find_yesno - Find values for specified keyword.
+ *
+ * @string: String to check.
+ * @find:   Name of keyword.
+ *
+ * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
+ */
+static s8 tomoyo_find_yesno(const char *string, const char *find)
+{
+	const char *cp = strstr(string, find);
+
+	if (cp) {
+		cp += strlen(find);
+		if (!strncmp(cp, "=yes", 4))
+			return 1;
+		else if (!strncmp(cp, "=no", 3))
+			return 0;
+	}
+	return -1;
+}
+
+/**
+ * tomoyo_set_uint - Set value for specified preference.
+ *
+ * @i:      Pointer to "unsigned int".
+ * @string: String to check.
+ * @find:   Name of keyword.
+ *
+ * Returns nothing.
+ */
+static void tomoyo_set_uint(unsigned int *i, const char *string,
+			    const char *find)
+{
+	const char *cp = strstr(string, find);
+
+	if (cp)
+		sscanf(cp + strlen(find), "=%u", i);
+}
+
+/**
+ * tomoyo_set_mode - Set mode for specified profile.
+ *
+ * @name:    Name of functionality.
+ * @value:   Mode for @name.
+ * @profile: Pointer to "struct tomoyo_profile".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_set_mode(char *name, const char *value,
+			   struct tomoyo_profile *profile)
+{
+	u8 i;
+	u8 config;
+
+	if (!strcmp(name, "CONFIG")) {
+		i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
+		config = profile->default_config;
+	} else if (tomoyo_str_starts(&name, "CONFIG::")) {
+		config = 0;
+		for (i = 0; i < TOMOYO_MAX_MAC_INDEX
+			     + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
+			int len = 0;
+
+			if (i < TOMOYO_MAX_MAC_INDEX) {
+				const u8 c = tomoyo_index2category[i];
+				const char *category =
+					tomoyo_category_keywords[c];
+
+				len = strlen(category);
+				if (strncmp(name, category, len) ||
+				    name[len++] != ':' || name[len++] != ':')
+					continue;
+			}
+			if (strcmp(name + len, tomoyo_mac_keywords[i]))
+				continue;
+			config = profile->config[i];
+			break;
+		}
+		if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
+			return -EINVAL;
+	} else {
+		return -EINVAL;
+	}
+	if (strstr(value, "use_default")) {
+		config = TOMOYO_CONFIG_USE_DEFAULT;
+	} else {
+		u8 mode;
+
+		for (mode = 0; mode < 4; mode++)
+			if (strstr(value, tomoyo_mode[mode]))
+				/*
+				 * Update lower 3 bits in order to distinguish
+				 * 'config' from 'TOMOYO_CONFIG_USE_DEFAULT'.
+				 */
+				config = (config & ~7) | mode;
+		if (config != TOMOYO_CONFIG_USE_DEFAULT) {
+			switch (tomoyo_find_yesno(value, "grant_log")) {
+			case 1:
+				config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
+				break;
+			case 0:
+				config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
+				break;
+			}
+			switch (tomoyo_find_yesno(value, "reject_log")) {
+			case 1:
+				config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
+				break;
+			case 0:
+				config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
+				break;
+			}
+		}
+	}
+	if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
+		profile->config[i] = config;
+	else if (config != TOMOYO_CONFIG_USE_DEFAULT)
+		profile->default_config = config;
+	return 0;
+}
+
+/**
+ * tomoyo_write_profile - Write profile table.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
+	__must_hold(&head->io_sem)
+{
+	char *data = head->write_buf;
+	unsigned int i;
+	char *cp;
+	struct tomoyo_profile *profile;
+
+	if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
+	    == 1)
+		return 0;
+	i = simple_strtoul(data, &cp, 10);
+	if (*cp != '-')
+		return -EINVAL;
+	data = cp + 1;
+	profile = tomoyo_assign_profile(head->w.ns, i);
+	if (!profile)
+		return -EINVAL;
+	cp = strchr(data, '=');
+	if (!cp)
+		return -EINVAL;
+	*cp++ = '\0';
+	if (!strcmp(data, "COMMENT")) {
+		static DEFINE_SPINLOCK(lock);
+		const struct tomoyo_path_info *new_comment
+			= tomoyo_get_name(cp);
+		const struct tomoyo_path_info *old_comment;
+
+		if (!new_comment)
+			return -ENOMEM;
+		spin_lock(&lock);
+		old_comment = profile->comment;
+		profile->comment = new_comment;
+		spin_unlock(&lock);
+		tomoyo_put_name(old_comment);
+		return 0;
+	}
+	if (!strcmp(data, "PREFERENCE")) {
+		for (i = 0; i < TOMOYO_MAX_PREF; i++)
+			tomoyo_set_uint(&profile->pref[i], cp,
+					tomoyo_pref_keywords[i]);
+		return 0;
+	}
+	return tomoyo_set_mode(data, cp, profile);
+}
+
+/**
+ * tomoyo_print_config - Print mode for specified functionality.
+ *
+ * @head:   Pointer to "struct tomoyo_io_buffer".
+ * @config: Mode for that functionality.
+ *
+ * Returns nothing.
+ *
+ * Caller prints functionality's name.
+ */
+static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
+	__must_hold(&head->io_sem)
+{
+	tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
+			 tomoyo_mode[config & 3],
+			 str_yes_no(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
+			 str_yes_no(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
+}
+
+/**
+ * tomoyo_read_profile - Read profile table.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
+	__must_hold(&head->io_sem)
+{
+	u8 index;
+	struct tomoyo_policy_namespace *ns =
+		container_of(head->r.ns, typeof(*ns), namespace_list);
+	const struct tomoyo_profile *profile;
+
+	if (head->r.eof)
+		return;
+ next:
+	index = head->r.index;
+	profile = ns->profile_ptr[index];
+	switch (head->r.step) {
+	case 0:
+		tomoyo_print_namespace(head);
+		tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
+				 ns->profile_version);
+		head->r.step++;
+		break;
+	case 1:
+		for ( ; head->r.index < TOMOYO_MAX_PROFILES;
+		      head->r.index++)
+			if (ns->profile_ptr[head->r.index])
+				break;
+		if (head->r.index == TOMOYO_MAX_PROFILES) {
+			head->r.eof = true;
+			return;
+		}
+		head->r.step++;
+		break;
+	case 2:
+		{
+			u8 i;
+			const struct tomoyo_path_info *comment =
+				profile->comment;
+
+			tomoyo_print_namespace(head);
+			tomoyo_io_printf(head, "%u-COMMENT=", index);
+			tomoyo_set_string(head, comment ? comment->name : "");
+			tomoyo_set_lf(head);
+			tomoyo_print_namespace(head);
+			tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
+			for (i = 0; i < TOMOYO_MAX_PREF; i++)
+				tomoyo_io_printf(head, "%s=%u ",
+						 tomoyo_pref_keywords[i],
+						 profile->pref[i]);
+			tomoyo_set_string(head, "}\n");
+			head->r.step++;
+		}
+		break;
+	case 3:
+		{
+			tomoyo_print_namespace(head);
+			tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
+			tomoyo_print_config(head, profile->default_config);
+			head->r.bit = 0;
+			head->r.step++;
+		}
+		break;
+	case 4:
+		for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
+			      + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
+			const u8 i = head->r.bit;
+			const u8 config = profile->config[i];
+
+			if (config == TOMOYO_CONFIG_USE_DEFAULT)
+				continue;
+			tomoyo_print_namespace(head);
+			if (i < TOMOYO_MAX_MAC_INDEX)
+				tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
+						 index,
+						 tomoyo_category_keywords
+						 [tomoyo_index2category[i]],
+						 tomoyo_mac_keywords[i]);
+			else
+				tomoyo_io_printf(head, "%u-CONFIG::%s", index,
+						 tomoyo_mac_keywords[i]);
+			tomoyo_print_config(head, config);
+			head->r.bit++;
+			break;
+		}
+		if (head->r.bit == TOMOYO_MAX_MAC_INDEX
+		    + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
+			head->r.index++;
+			head->r.step = 1;
+		}
+		break;
+	}
+	if (tomoyo_flush(head))
+		goto next;
+}
+
+/**
+ * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_head".
+ * @b: Pointer to "struct tomoyo_acl_head".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
+				const struct tomoyo_acl_head *b)
+{
+	return container_of(a, struct tomoyo_manager, head)->manager ==
+		container_of(b, struct tomoyo_manager, head)->manager;
+}
+
+/**
+ * tomoyo_update_manager_entry - Add a manager entry.
+ *
+ * @manager:   The path to manager or the domainnamme.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_update_manager_entry(const char *manager,
+				       const bool is_delete)
+	__must_hold_shared(&tomoyo_ss)
+{
+	struct tomoyo_manager e = { };
+	struct tomoyo_acl_param param = {
+		/* .ns = &tomoyo_kernel_namespace, */
+		.is_delete = is_delete,
+		.list = &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER],
+	};
+	int error = is_delete ? -ENOENT : -ENOMEM;
+
+	if (!tomoyo_correct_domain(manager) &&
+	    !tomoyo_correct_word(manager))
+		return -EINVAL;
+	e.manager = tomoyo_get_name(manager);
+	if (e.manager) {
+		error = tomoyo_update_policy(&e.head, sizeof(e), &param,
+					     tomoyo_same_manager);
+		tomoyo_put_name(e.manager);
+	}
+	return error;
+}
+
+/**
+ * tomoyo_write_manager - Write manager policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
+	__must_hold_shared(&tomoyo_ss)
+	__must_hold(&head->io_sem)
+{
+	char *data = head->write_buf;
+
+	if (!strcmp(data, "manage_by_non_root")) {
+		tomoyo_manage_by_non_root = !head->w.is_delete;
+		return 0;
+	}
+	return tomoyo_update_manager_entry(data, head->w.is_delete);
+}
+
+/**
+ * tomoyo_read_manager - Read manager policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
+	__must_hold_shared(&tomoyo_ss)
+{
+	if (head->r.eof)
+		return;
+	list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER]) {
+		struct tomoyo_manager *ptr =
+			list_entry(head->r.acl, typeof(*ptr), head.list);
+
+		if (ptr->head.is_deleted)
+			continue;
+		if (!tomoyo_flush(head))
+			return;
+		tomoyo_set_string(head, ptr->manager->name);
+		tomoyo_set_lf(head);
+	}
+	head->r.eof = true;
+}
+
+/**
+ * tomoyo_manager - Check whether the current process is a policy manager.
+ *
+ * Returns true if the current process is permitted to modify policy
+ * via /sys/kernel/security/tomoyo/ interface.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static bool tomoyo_manager(void)
+	__must_hold_shared(&tomoyo_ss)
+{
+	struct tomoyo_manager *ptr;
+	const char *exe;
+	const struct task_struct *task = current;
+	const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
+	bool found = IS_ENABLED(CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING);
+
+	if (!tomoyo_policy_loaded)
+		return true;
+	if (!tomoyo_manage_by_non_root &&
+	    (!uid_eq(task->cred->uid,  GLOBAL_ROOT_UID) ||
+	     !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
+		return false;
+	exe = tomoyo_get_exe();
+	if (!exe)
+		return false;
+	list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		if (!ptr->head.is_deleted &&
+		    (!tomoyo_pathcmp(domainname, ptr->manager) ||
+		     !strcmp(exe, ptr->manager->name))) {
+			found = true;
+			break;
+		}
+	}
+	if (!found) { /* Reduce error messages. */
+		static pid_t last_pid;
+		const pid_t pid = current->pid;
+
+		if (last_pid != pid) {
+			pr_warn("%s ( %s ) is not permitted to update policies.\n",
+				domainname->name, exe);
+			last_pid = pid;
+		}
+	}
+	kfree(exe);
+	return found;
+}
+
+static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
+(unsigned int serial);
+
+/**
+ * tomoyo_select_domain - Parse select command.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @data: String to parse.
+ *
+ * Returns true on success, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
+				 const char *data)
+	__must_hold_shared(&tomoyo_ss)
+	__must_hold(&head->io_sem)
+{
+	unsigned int pid;
+	struct tomoyo_domain_info *domain = NULL;
+	bool global_pid = false;
+
+	if (strncmp(data, "select ", 7))
+		return false;
+	data += 7;
+	if (sscanf(data, "pid=%u", &pid) == 1 ||
+	    (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
+		struct task_struct *p;
+
+		rcu_read_lock();
+		if (global_pid)
+			p = find_task_by_pid_ns(pid, &init_pid_ns);
+		else
+			p = find_task_by_vpid(pid);
+		if (p)
+			domain = tomoyo_task(p)->domain_info;
+		rcu_read_unlock();
+	} else if (!strncmp(data, "domain=", 7)) {
+		if (tomoyo_domain_def(data + 7))
+			domain = tomoyo_find_domain(data + 7);
+	} else if (sscanf(data, "Q=%u", &pid) == 1) {
+		domain = tomoyo_find_domain_by_qid(pid);
+	} else
+		return false;
+	head->w.domain = domain;
+	/* Accessing read_buf is safe because head->io_sem is held. */
+	if (!head->read_buf)
+		return true; /* Do nothing if open(O_WRONLY). */
+	memset(&head->r, 0, sizeof(head->r));
+	head->r.print_this_domain_only = true;
+	if (domain)
+		head->r.domain = &domain->list;
+	else
+		head->r.eof = true;
+	tomoyo_io_printf(head, "# select %s\n", data);
+	if (domain && domain->is_deleted)
+		tomoyo_io_printf(head, "# This is a deleted domain.\n");
+	return true;
+}
+
+/**
+ * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
+				 const struct tomoyo_acl_info *b)
+{
+	const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
+	const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
+
+	return p1->domainname == p2->domainname;
+}
+
+/**
+ * tomoyo_write_task - Update task related list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_task(struct tomoyo_acl_param *param)
+	__must_hold_shared(&tomoyo_ss)
+{
+	int error = -EINVAL;
+
+	if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
+		struct tomoyo_task_acl e = {
+			.head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
+			.domainname = tomoyo_get_domainname(param),
+		};
+
+		if (e.domainname)
+			error = tomoyo_update_domain(&e.head, sizeof(e), param,
+						     tomoyo_same_task_acl,
+						     NULL);
+		tomoyo_put_name(e.domainname);
+	}
+	return error;
+}
+
+/**
+ * tomoyo_delete_domain - Delete a domain.
+ *
+ * @domainname: The name of domain.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_delete_domain(char *domainname)
+	__must_hold_shared(&tomoyo_ss)
+{
+	struct tomoyo_domain_info *domain;
+	struct tomoyo_path_info name;
+
+	name.name = domainname;
+	tomoyo_fill_path_info(&name);
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		return -EINTR;
+	/* Is there an active domain? */
+	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		/* Never delete tomoyo_kernel_domain */
+		if (domain == &tomoyo_kernel_domain)
+			continue;
+		if (domain->is_deleted ||
+		    tomoyo_pathcmp(domain->domainname, &name))
+			continue;
+		domain->is_deleted = true;
+		break;
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+	return 0;
+}
+
+/**
+ * tomoyo_write_domain2 - Write domain policy.
+ *
+ * @ns:        Pointer to "struct tomoyo_policy_namespace".
+ * @list:      Pointer to "struct list_head".
+ * @data:      Policy to be interpreted.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
+				struct list_head *list, char *data,
+				const bool is_delete)
+	__must_hold_shared(&tomoyo_ss)
+{
+	struct tomoyo_acl_param param = {
+		.ns = ns,
+		.list = list,
+		.data = data,
+		.is_delete = is_delete,
+	};
+	static const struct {
+		const char *keyword;
+		int (*write)(struct tomoyo_acl_param *param);
+	} tomoyo_callback[5] = {
+		{ "file ", tomoyo_write_file },
+		{ "network inet ", tomoyo_write_inet_network },
+		{ "network unix ", tomoyo_write_unix_network },
+		{ "misc ", tomoyo_write_misc },
+		{ "task ", tomoyo_write_task },
+	};
+	u8 i;
+
+	for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
+		if (!tomoyo_str_starts(&param.data,
+				       tomoyo_callback[i].keyword))
+			continue;
+		return tomoyo_callback[i].write(&param);
+	}
+	return -EINVAL;
+}
+
+/* String table for domain flags. */
+const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
+	[TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
+	[TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
+};
+
+/**
+ * tomoyo_write_domain - Write domain policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
+	__must_hold_shared(&tomoyo_ss)
+	__must_hold(&head->io_sem)
+{
+	char *data = head->write_buf;
+	struct tomoyo_policy_namespace *ns;
+	struct tomoyo_domain_info *domain = head->w.domain;
+	const bool is_delete = head->w.is_delete;
+	bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
+	unsigned int idx;
+
+	if (*data == '<') {
+		int ret = 0;
+
+		domain = NULL;
+		if (is_delete)
+			ret = tomoyo_delete_domain(data);
+		else if (is_select)
+			domain = tomoyo_find_domain(data);
+		else
+			domain = tomoyo_assign_domain(data, false);
+		head->w.domain = domain;
+		return ret;
+	}
+	if (!domain)
+		return -EINVAL;
+	ns = domain->ns;
+	if (sscanf(data, "use_profile %u", &idx) == 1
+	    && idx < TOMOYO_MAX_PROFILES) {
+		if (!tomoyo_policy_loaded || ns->profile_ptr[idx])
+			if (!is_delete)
+				domain->profile = (u8) idx;
+		return 0;
+	}
+	if (sscanf(data, "use_group %u\n", &idx) == 1
+	    && idx < TOMOYO_MAX_ACL_GROUPS) {
+		if (!is_delete)
+			set_bit(idx, domain->group);
+		else
+			clear_bit(idx, domain->group);
+		return 0;
+	}
+	for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) {
+		const char *cp = tomoyo_dif[idx];
+
+		if (strncmp(data, cp, strlen(cp) - 1))
+			continue;
+		domain->flags[idx] = !is_delete;
+		return 0;
+	}
+	return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
+				    is_delete);
+}
+
+/**
+ * tomoyo_print_condition - Print condition part.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @cond: Pointer to "struct tomoyo_condition".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
+				   const struct tomoyo_condition *cond)
+	__must_hold(&head->io_sem)
+{
+	switch (head->r.cond_step) {
+	case 0:
+		head->r.cond_index = 0;
+		head->r.cond_step++;
+		if (cond->transit) {
+			tomoyo_set_space(head);
+			tomoyo_set_string(head, cond->transit->name);
+		}
+		fallthrough;
+	case 1:
+		{
+			const u16 condc = cond->condc;
+			const struct tomoyo_condition_element *condp =
+				(typeof(condp)) (cond + 1);
+			const struct tomoyo_number_union *numbers_p =
+				(typeof(numbers_p)) (condp + condc);
+			const struct tomoyo_name_union *names_p =
+				(typeof(names_p))
+				(numbers_p + cond->numbers_count);
+			const struct tomoyo_argv *argv =
+				(typeof(argv)) (names_p + cond->names_count);
+			const struct tomoyo_envp *envp =
+				(typeof(envp)) (argv + cond->argc);
+			u16 skip;
+
+			for (skip = 0; skip < head->r.cond_index; skip++) {
+				const u8 left = condp->left;
+				const u8 right = condp->right;
+
+				condp++;
+				switch (left) {
+				case TOMOYO_ARGV_ENTRY:
+					argv++;
+					continue;
+				case TOMOYO_ENVP_ENTRY:
+					envp++;
+					continue;
+				case TOMOYO_NUMBER_UNION:
+					numbers_p++;
+					break;
+				}
+				switch (right) {
+				case TOMOYO_NAME_UNION:
+					names_p++;
+					break;
+				case TOMOYO_NUMBER_UNION:
+					numbers_p++;
+					break;
+				}
+			}
+			while (head->r.cond_index < condc) {
+				const u8 match = condp->equals;
+				const u8 left = condp->left;
+				const u8 right = condp->right;
+
+				if (!tomoyo_flush(head))
+					return false;
+				condp++;
+				head->r.cond_index++;
+				tomoyo_set_space(head);
+				switch (left) {
+				case TOMOYO_ARGV_ENTRY:
+					tomoyo_io_printf(head,
+							 "exec.argv[%lu]%s=\"",
+							 argv->index, argv->is_not ? "!" : "");
+					tomoyo_set_string(head,
+							  argv->value->name);
+					tomoyo_set_string(head, "\"");
+					argv++;
+					continue;
+				case TOMOYO_ENVP_ENTRY:
+					tomoyo_set_string(head,
+							  "exec.envp[\"");
+					tomoyo_set_string(head,
+							  envp->name->name);
+					tomoyo_io_printf(head, "\"]%s=", envp->is_not ? "!" : "");
+					if (envp->value) {
+						tomoyo_set_string(head, "\"");
+						tomoyo_set_string(head, envp->value->name);
+						tomoyo_set_string(head, "\"");
+					} else {
+						tomoyo_set_string(head,
+								  "NULL");
+					}
+					envp++;
+					continue;
+				case TOMOYO_NUMBER_UNION:
+					tomoyo_print_number_union_nospace
+						(head, numbers_p++);
+					break;
+				default:
+					tomoyo_set_string(head,
+					       tomoyo_condition_keyword[left]);
+					break;
+				}
+				tomoyo_set_string(head, match ? "=" : "!=");
+				switch (right) {
+				case TOMOYO_NAME_UNION:
+					tomoyo_print_name_union_quoted
+						(head, names_p++);
+					break;
+				case TOMOYO_NUMBER_UNION:
+					tomoyo_print_number_union_nospace
+						(head, numbers_p++);
+					break;
+				default:
+					tomoyo_set_string(head,
+					  tomoyo_condition_keyword[right]);
+					break;
+				}
+			}
+		}
+		head->r.cond_step++;
+		fallthrough;
+	case 2:
+		if (!tomoyo_flush(head))
+			break;
+		head->r.cond_step++;
+		fallthrough;
+	case 3:
+		if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
+			tomoyo_io_printf(head, " grant_log=%s",
+					 str_yes_no(cond->grant_log ==
+						    TOMOYO_GRANTLOG_YES));
+		tomoyo_set_lf(head);
+		return true;
+	}
+	return false;
+}
+
+/**
+ * tomoyo_set_group - Print "acl_group " header keyword and category name.
+ *
+ * @head:     Pointer to "struct tomoyo_io_buffer".
+ * @category: Category name.
+ *
+ * Returns nothing.
+ */
+static void tomoyo_set_group(struct tomoyo_io_buffer *head,
+			     const char *category)
+	__must_hold(&head->io_sem)
+{
+	if (head->type == TOMOYO_EXCEPTIONPOLICY) {
+		tomoyo_print_namespace(head);
+		tomoyo_io_printf(head, "acl_group %u ",
+				 head->r.acl_group_index);
+	}
+	tomoyo_set_string(head, category);
+}
+
+/**
+ * tomoyo_print_entry - Print an ACL entry.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @acl:  Pointer to an ACL entry.
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
+			       struct tomoyo_acl_info *acl)
+	__must_hold(&head->io_sem)
+{
+	const u8 acl_type = acl->type;
+	bool first = true;
+	u8 bit;
+
+	if (head->r.print_cond_part)
+		goto print_cond_part;
+	if (acl->is_deleted)
+		return true;
+	if (!tomoyo_flush(head))
+		return false;
+	else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
+		struct tomoyo_path_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u16 perm = ptr->perm;
+
+		for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (head->r.print_transition_related_only &&
+			    bit != TOMOYO_TYPE_EXECUTE)
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "file ");
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_path_keyword[bit]);
+		}
+		if (first)
+			return true;
+		tomoyo_print_name_union(head, &ptr->name);
+	} else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
+		struct tomoyo_task_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+
+		tomoyo_set_group(head, "task ");
+		tomoyo_set_string(head, "manual_domain_transition ");
+		tomoyo_set_string(head, ptr->domainname->name);
+	} else if (head->r.print_transition_related_only) {
+		return true;
+	} else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
+		struct tomoyo_path2_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u8 perm = ptr->perm;
+
+		for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "file ");
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_mac_keywords
+					  [tomoyo_pp2mac[bit]]);
+		}
+		if (first)
+			return true;
+		tomoyo_print_name_union(head, &ptr->name1);
+		tomoyo_print_name_union(head, &ptr->name2);
+	} else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
+		struct tomoyo_path_number_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u8 perm = ptr->perm;
+
+		for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "file ");
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_mac_keywords
+					  [tomoyo_pn2mac[bit]]);
+		}
+		if (first)
+			return true;
+		tomoyo_print_name_union(head, &ptr->name);
+		tomoyo_print_number_union(head, &ptr->number);
+	} else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
+		struct tomoyo_mkdev_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u8 perm = ptr->perm;
+
+		for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "file ");
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_mac_keywords
+					  [tomoyo_pnnn2mac[bit]]);
+		}
+		if (first)
+			return true;
+		tomoyo_print_name_union(head, &ptr->name);
+		tomoyo_print_number_union(head, &ptr->mode);
+		tomoyo_print_number_union(head, &ptr->major);
+		tomoyo_print_number_union(head, &ptr->minor);
+	} else if (acl_type == TOMOYO_TYPE_INET_ACL) {
+		struct tomoyo_inet_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u8 perm = ptr->perm;
+
+		for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "network inet ");
+				tomoyo_set_string(head, tomoyo_proto_keyword
+						  [ptr->protocol]);
+				tomoyo_set_space(head);
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
+		}
+		if (first)
+			return true;
+		tomoyo_set_space(head);
+		if (ptr->address.group) {
+			tomoyo_set_string(head, "@");
+			tomoyo_set_string(head, ptr->address.group->group_name
+					  ->name);
+		} else {
+			char buf[128];
+
+			tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
+			tomoyo_io_printf(head, "%s", buf);
+		}
+		tomoyo_print_number_union(head, &ptr->port);
+	} else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
+		struct tomoyo_unix_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u8 perm = ptr->perm;
+
+		for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "network unix ");
+				tomoyo_set_string(head, tomoyo_proto_keyword
+						  [ptr->protocol]);
+				tomoyo_set_space(head);
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
+		}
+		if (first)
+			return true;
+		tomoyo_print_name_union(head, &ptr->name);
+	} else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
+		struct tomoyo_mount_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+
+		tomoyo_set_group(head, "file mount");
+		tomoyo_print_name_union(head, &ptr->dev_name);
+		tomoyo_print_name_union(head, &ptr->dir_name);
+		tomoyo_print_name_union(head, &ptr->fs_type);
+		tomoyo_print_number_union(head, &ptr->flags);
+	} else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
+		struct tomoyo_env_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+
+		tomoyo_set_group(head, "misc env ");
+		tomoyo_set_string(head, ptr->env->name);
+	}
+	if (acl->cond) {
+		head->r.print_cond_part = true;
+		head->r.cond_step = 0;
+		if (!tomoyo_flush(head))
+			return false;
+print_cond_part:
+		if (!tomoyo_print_condition(head, acl->cond))
+			return false;
+		head->r.print_cond_part = false;
+	} else {
+		tomoyo_set_lf(head);
+	}
+	return true;
+}
+
+/**
+ * tomoyo_read_domain2 - Read domain policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @list: Pointer to "struct list_head".
+ *
+ * Caller holds tomoyo_read_lock().
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
+				struct list_head *list)
+	__must_hold_shared(&tomoyo_ss)
+	__must_hold(&head->io_sem)
+{
+	list_for_each_cookie(head->r.acl, list) {
+		struct tomoyo_acl_info *ptr =
+			list_entry(head->r.acl, typeof(*ptr), list);
+
+		if (!tomoyo_print_entry(head, ptr))
+			return false;
+	}
+	head->r.acl = NULL;
+	return true;
+}
+
+/**
+ * tomoyo_read_domain - Read domain policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
+	__must_hold_shared(&tomoyo_ss)
+	__must_hold(&head->io_sem)
+{
+	if (head->r.eof)
+		return;
+	list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
+		struct tomoyo_domain_info *domain =
+			list_entry(head->r.domain, typeof(*domain), list);
+		u8 i;
+
+		switch (head->r.step) {
+		case 0:
+			if (domain->is_deleted &&
+			    !head->r.print_this_domain_only)
+				continue;
+			/* Print domainname and flags. */
+			tomoyo_set_string(head, domain->domainname->name);
+			tomoyo_set_lf(head);
+			tomoyo_io_printf(head, "use_profile %u\n",
+					 domain->profile);
+			for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
+				if (domain->flags[i])
+					tomoyo_set_string(head, tomoyo_dif[i]);
+			head->r.index = 0;
+			head->r.step++;
+			fallthrough;
+		case 1:
+			while (head->r.index < TOMOYO_MAX_ACL_GROUPS) {
+				i = head->r.index++;
+				if (!test_bit(i, domain->group))
+					continue;
+				tomoyo_io_printf(head, "use_group %u\n", i);
+				if (!tomoyo_flush(head))
+					return;
+			}
+			head->r.index = 0;
+			head->r.step++;
+			tomoyo_set_lf(head);
+			fallthrough;
+		case 2:
+			if (!tomoyo_read_domain2(head, &domain->acl_info_list))
+				return;
+			head->r.step++;
+			if (!tomoyo_set_lf(head))
+				return;
+			fallthrough;
+		case 3:
+			head->r.step = 0;
+			if (head->r.print_this_domain_only)
+				goto done;
+		}
+	}
+ done:
+	head->r.eof = true;
+}
+
+/**
+ * tomoyo_write_pid: Specify PID to obtain domainname.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0.
+ */
+static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
+{
+	head->r.eof = false;
+	return 0;
+}
+
+/**
+ * tomoyo_read_pid - Get domainname of the specified PID.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns the domainname which the specified PID is in on success,
+ * empty string otherwise.
+ * The PID is specified by tomoyo_write_pid() so that the user can obtain
+ * using read()/write() interface rather than sysctl() interface.
+ */
+static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
+	__must_hold(&head->io_sem)
+{
+	char *buf = head->write_buf;
+	bool global_pid = false;
+	unsigned int pid;
+	struct task_struct *p;
+	struct tomoyo_domain_info *domain = NULL;
+
+	/* Accessing write_buf is safe because head->io_sem is held. */
+	if (!buf) {
+		head->r.eof = true;
+		return; /* Do nothing if open(O_RDONLY). */
+	}
+	if (head->r.w_pos || head->r.eof)
+		return;
+	head->r.eof = true;
+	if (tomoyo_str_starts(&buf, "global-pid "))
+		global_pid = true;
+	if (kstrtouint(buf, 10, &pid))
+		return;
+	rcu_read_lock();
+	if (global_pid)
+		p = find_task_by_pid_ns(pid, &init_pid_ns);
+	else
+		p = find_task_by_vpid(pid);
+	if (p)
+		domain = tomoyo_task(p)->domain_info;
+	rcu_read_unlock();
+	if (!domain)
+		return;
+	tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
+	tomoyo_set_string(head, domain->domainname->name);
+}
+
+/* String table for domain transition control keywords. */
+static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
+	[TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
+	[TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
+	[TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
+	[TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
+	[TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
+	[TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
+};
+
+/* String table for grouping keywords. */
+static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
+	[TOMOYO_PATH_GROUP]    = "path_group ",
+	[TOMOYO_NUMBER_GROUP]  = "number_group ",
+	[TOMOYO_ADDRESS_GROUP] = "address_group ",
+};
+
+/**
+ * tomoyo_write_exception - Write exception policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
+	__must_hold_shared(&tomoyo_ss)
+	__must_hold(&head->io_sem)
+{
+	const bool is_delete = head->w.is_delete;
+	struct tomoyo_acl_param param = {
+		.ns = head->w.ns,
+		.is_delete = is_delete,
+		.data = head->write_buf,
+	};
+	u8 i;
+
+	if (tomoyo_str_starts(&param.data, "aggregator "))
+		return tomoyo_write_aggregator(&param);
+	for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
+		if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
+			return tomoyo_write_transition_control(&param, i);
+	for (i = 0; i < TOMOYO_MAX_GROUP; i++)
+		if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
+			return tomoyo_write_group(&param, i);
+	if (tomoyo_str_starts(&param.data, "acl_group ")) {
+		unsigned int group;
+		char *data;
+
+		group = simple_strtoul(param.data, &data, 10);
+		if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
+			return tomoyo_write_domain2
+				(head->w.ns, &head->w.ns->acl_group[group],
+				 data, is_delete);
+	}
+	return -EINVAL;
+}
+
+/**
+ * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @idx:  Index number.
+ *
+ * Returns true on success, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
+	__must_hold_shared(&tomoyo_ss)
+	__must_hold(&head->io_sem)
+{
+	struct tomoyo_policy_namespace *ns =
+		container_of(head->r.ns, typeof(*ns), namespace_list);
+	struct list_head *list = &ns->group_list[idx];
+
+	list_for_each_cookie(head->r.group, list) {
+		struct tomoyo_group *group =
+			list_entry(head->r.group, typeof(*group), head.list);
+
+		list_for_each_cookie(head->r.acl, &group->member_list) {
+			struct tomoyo_acl_head *ptr =
+				list_entry(head->r.acl, typeof(*ptr), list);
+
+			if (ptr->is_deleted)
+				continue;
+			if (!tomoyo_flush(head))
+				return false;
+			tomoyo_print_namespace(head);
+			tomoyo_set_string(head, tomoyo_group_name[idx]);
+			tomoyo_set_string(head, group->group_name->name);
+			if (idx == TOMOYO_PATH_GROUP) {
+				tomoyo_set_space(head);
+				tomoyo_set_string(head, container_of
+					       (ptr, struct tomoyo_path_group,
+						head)->member_name->name);
+			} else if (idx == TOMOYO_NUMBER_GROUP) {
+				tomoyo_print_number_union(head, &container_of
+							  (ptr,
+						   struct tomoyo_number_group,
+							   head)->number);
+			} else if (idx == TOMOYO_ADDRESS_GROUP) {
+				char buffer[128];
+				struct tomoyo_address_group *member =
+					container_of(ptr, typeof(*member),
+						     head);
+
+				tomoyo_print_ip(buffer, sizeof(buffer),
+						&member->address);
+				tomoyo_io_printf(head, " %s", buffer);
+			}
+			tomoyo_set_lf(head);
+		}
+		head->r.acl = NULL;
+	}
+	head->r.group = NULL;
+	return true;
+}
+
+/**
+ * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @idx:  Index number.
+ *
+ * Returns true on success, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
+	__must_hold_shared(&tomoyo_ss)
+{
+	struct tomoyo_policy_namespace *ns =
+		container_of(head->r.ns, typeof(*ns), namespace_list);
+	struct list_head *list = &ns->policy_list[idx];
+
+	list_for_each_cookie(head->r.acl, list) {
+		struct tomoyo_acl_head *acl =
+			container_of(head->r.acl, typeof(*acl), list);
+		if (acl->is_deleted)
+			continue;
+		if (!tomoyo_flush(head))
+			return false;
+		switch (idx) {
+		case TOMOYO_ID_TRANSITION_CONTROL:
+			{
+				struct tomoyo_transition_control *ptr =
+					container_of(acl, typeof(*ptr), head);
+
+				tomoyo_print_namespace(head);
+				tomoyo_set_string(head, tomoyo_transition_type
+						  [ptr->type]);
+				tomoyo_set_string(head, ptr->program ?
+						  ptr->program->name : "any");
+				tomoyo_set_string(head, " from ");
+				tomoyo_set_string(head, ptr->domainname ?
+						  ptr->domainname->name :
+						  "any");
+			}
+			break;
+		case TOMOYO_ID_AGGREGATOR:
+			{
+				struct tomoyo_aggregator *ptr =
+					container_of(acl, typeof(*ptr), head);
+
+				tomoyo_print_namespace(head);
+				tomoyo_set_string(head, "aggregator ");
+				tomoyo_set_string(head,
+						  ptr->original_name->name);
+				tomoyo_set_space(head);
+				tomoyo_set_string(head,
+					       ptr->aggregated_name->name);
+			}
+			break;
+		default:
+			continue;
+		}
+		tomoyo_set_lf(head);
+	}
+	head->r.acl = NULL;
+	return true;
+}
+
+/**
+ * tomoyo_read_exception - Read exception policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
+	__must_hold_shared(&tomoyo_ss)
+	__must_hold(&head->io_sem)
+{
+	struct tomoyo_policy_namespace *ns =
+		container_of(head->r.ns, typeof(*ns), namespace_list);
+
+	if (head->r.eof)
+		return;
+	while (head->r.step < TOMOYO_MAX_POLICY &&
+	       tomoyo_read_policy(head, head->r.step))
+		head->r.step++;
+	if (head->r.step < TOMOYO_MAX_POLICY)
+		return;
+	while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
+	       tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
+		head->r.step++;
+	if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
+		return;
+	while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
+	       + TOMOYO_MAX_ACL_GROUPS) {
+		head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
+			- TOMOYO_MAX_GROUP;
+		if (!tomoyo_read_domain2(head, &ns->acl_group
+					 [head->r.acl_group_index]))
+			return;
+		head->r.step++;
+	}
+	head->r.eof = true;
+}
+
+/* Wait queue for kernel -> userspace notification. */
+static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
+/* Wait queue for userspace -> kernel notification. */
+static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
+
+/* Structure for query. */
+struct tomoyo_query {
+	struct list_head list;
+	struct tomoyo_domain_info *domain;
+	char *query;
+	size_t query_len;
+	unsigned int serial;
+	u8 timer;
+	u8 answer;
+	u8 retry;
+};
+
+/* The list for "struct tomoyo_query". */
+static LIST_HEAD(tomoyo_query_list);
+
+/* Lock for manipulating tomoyo_query_list. */
+static DEFINE_SPINLOCK(tomoyo_query_list_lock);
+
+/*
+ * Number of "struct file" referring /sys/kernel/security/tomoyo/query
+ * interface.
+ */
+static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
+
+/**
+ * tomoyo_truncate - Truncate a line.
+ *
+ * @str: String to truncate.
+ *
+ * Returns length of truncated @str.
+ */
+static int tomoyo_truncate(char *str)
+{
+	char *start = str;
+
+	while (*(unsigned char *) str > (unsigned char) ' ')
+		str++;
+	*str = '\0';
+	return strlen(start) + 1;
+}
+
+/**
+ * tomoyo_numscan - sscanf() which stores the length of a decimal integer value.
+ *
+ * @str:   String to scan.
+ * @head:  Leading string that must start with.
+ * @width: Pointer to "int" for storing length of a decimal integer value after @head.
+ * @tail:  Optional character that must match after a decimal integer value.
+ *
+ * Returns whether @str starts with @head and a decimal value follows @head.
+ */
+static bool tomoyo_numscan(const char *str, const char *head, int *width, const char tail)
+{
+	const char *cp;
+	const int n = strlen(head);
+
+	if (!strncmp(str, head, n)) {
+		cp = str + n;
+		while (*cp && *cp >= '0' && *cp <= '9')
+			cp++;
+		if (*cp == tail || !tail) {
+			*width = cp - (str + n);
+			return *width != 0;
+		}
+	}
+	*width = 0;
+	return 0;
+}
+
+/**
+ * tomoyo_patternize_path - Make patterns for file path. Used by learning mode.
+ *
+ * @buffer: Destination buffer.
+ * @len:    Size of @buffer.
+ * @entry:  Original line.
+ *
+ * Returns nothing.
+ */
+static void tomoyo_patternize_path(char *buffer, const int len, char *entry)
+{
+	int width;
+	char *cp = entry;
+
+	/* Nothing to do if this line is not for "file" related entry. */
+	if (strncmp(entry, "file ", 5))
+		goto flush;
+	/*
+	 * Nothing to do if there is no colon in this line, for this rewriting
+	 * applies to only filesystems where numeric values in the path are volatile.
+	 */
+	cp = strchr(entry + 5, ':');
+	if (!cp) {
+		cp = entry;
+		goto flush;
+	}
+	/* Flush e.g. "file ioctl" part. */
+	while (*cp != ' ')
+		cp--;
+	*cp++ = '\0';
+	tomoyo_addprintf(buffer, len, "%s ", entry);
+	/* e.g. file ioctl pipe:[$INO] $CMD */
+	if (tomoyo_numscan(cp, "pipe:[", &width, ']')) {
+		cp += width + 7;
+		tomoyo_addprintf(buffer, len, "pipe:[\\$]");
+		goto flush;
+	}
+	/* e.g. file ioctl socket:[$INO] $CMD */
+	if (tomoyo_numscan(cp, "socket:[", &width, ']')) {
+		cp += width + 9;
+		tomoyo_addprintf(buffer, len, "socket:[\\$]");
+		goto flush;
+	}
+	if (!strncmp(cp, "proc:/self", 10)) {
+		/* e.g. file read proc:/self/task/$TID/fdinfo/$FD */
+		cp += 10;
+		tomoyo_addprintf(buffer, len, "proc:/self");
+	} else if (tomoyo_numscan(cp, "proc:/", &width, 0)) {
+		/* e.g. file read proc:/$PID/task/$TID/fdinfo/$FD */
+		/*
+		 * Don't patternize $PID part if $PID == 1, for several
+		 * programs access only files in /proc/1/ directory.
+		 */
+		cp += width + 6;
+		if (width == 1 && *(cp - 1) == '1')
+			tomoyo_addprintf(buffer, len, "proc:/1");
+		else
+			tomoyo_addprintf(buffer, len, "proc:/\\$");
+	} else {
+		goto flush;
+	}
+	/* Patternize $TID part if "/task/" follows. */
+	if (tomoyo_numscan(cp, "/task/", &width, 0)) {
+		cp += width + 6;
+		tomoyo_addprintf(buffer, len, "/task/\\$");
+	}
+	/* Patternize $FD part if "/fd/" or "/fdinfo/" follows. */
+	if (tomoyo_numscan(cp, "/fd/", &width, 0)) {
+		cp += width + 4;
+		tomoyo_addprintf(buffer, len, "/fd/\\$");
+	} else if (tomoyo_numscan(cp, "/fdinfo/", &width, 0)) {
+		cp += width + 8;
+		tomoyo_addprintf(buffer, len, "/fdinfo/\\$");
+	}
+flush:
+	/* Flush remaining part if any. */
+	if (*cp)
+		tomoyo_addprintf(buffer, len, "%s", cp);
+}
+
+/**
+ * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @header: Lines containing ACL.
+ *
+ * Returns nothing.
+ */
+static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
+	__must_hold_shared(&tomoyo_ss)
+{
+	char *buffer;
+	char *realpath = NULL;
+	char *argv0 = NULL;
+	char *symlink = NULL;
+	char *cp = strchr(header, '\n');
+	int len;
+
+	if (!cp)
+		return;
+	cp = strchr(cp + 1, '\n');
+	if (!cp)
+		return;
+	*cp++ = '\0';
+	/* Reserve some space for potentially using patterns. */
+	len = strlen(cp) + 16;
+	/* strstr() will return NULL if ordering is wrong. */
+	if (*cp == 'f') {
+		argv0 = strstr(header, " argv[]={ \"");
+		if (argv0) {
+			argv0 += 10;
+			len += tomoyo_truncate(argv0) + 14;
+		}
+		realpath = strstr(header, " exec={ realpath=\"");
+		if (realpath) {
+			realpath += 8;
+			len += tomoyo_truncate(realpath) + 6;
+		}
+		symlink = strstr(header, " symlink.target=\"");
+		if (symlink)
+			len += tomoyo_truncate(symlink + 1) + 1;
+	}
+	buffer = kmalloc(len, GFP_NOFS | __GFP_ZERO);
+	if (!buffer)
+		return;
+	tomoyo_patternize_path(buffer, len, cp);
+	if (realpath)
+		tomoyo_addprintf(buffer, len, " exec.%s", realpath);
+	if (argv0)
+		tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
+	if (symlink)
+		tomoyo_addprintf(buffer, len, "%s", symlink);
+	tomoyo_normalize_line(buffer);
+	if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
+				  false))
+		tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
+	kfree(buffer);
+}
+
+/**
+ * tomoyo_supervisor - Ask for the supervisor's decision.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @fmt: The printf()'s format string, followed by parameters.
+ *
+ * Returns 0 if the supervisor decided to permit the access request which
+ * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
+ * supervisor decided to retry the access request which violated the policy in
+ * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
+ */
+int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
+{
+	va_list args;
+	int error;
+	int len;
+	static unsigned int tomoyo_serial;
+	struct tomoyo_query entry = { };
+	bool quota_exceeded = false;
+
+	va_start(args, fmt);
+	len = vsnprintf(NULL, 0, fmt, args) + 1;
+	va_end(args);
+	/* Write /sys/kernel/security/tomoyo/audit. */
+	va_start(args, fmt);
+	tomoyo_write_log2(r, len, fmt, args);
+	va_end(args);
+	/* Nothing more to do if granted. */
+	if (r->granted)
+		return 0;
+	if (r->mode)
+		tomoyo_update_stat(r->mode);
+	switch (r->mode) {
+	case TOMOYO_CONFIG_ENFORCING:
+		error = -EPERM;
+		if (atomic_read(&tomoyo_query_observers))
+			break;
+		goto out;
+	case TOMOYO_CONFIG_LEARNING:
+		error = 0;
+		/* Check max_learning_entry parameter. */
+		if (tomoyo_domain_quota_is_ok(r))
+			break;
+		fallthrough;
+	default:
+		return 0;
+	}
+	/* Get message. */
+	va_start(args, fmt);
+	entry.query = tomoyo_init_log(r, len, fmt, args);
+	va_end(args);
+	if (!entry.query)
+		goto out;
+	entry.query_len = strlen(entry.query) + 1;
+	if (!error) {
+		tomoyo_add_entry(r->domain, entry.query);
+		goto out;
+	}
+	len = kmalloc_size_roundup(entry.query_len);
+	entry.domain = r->domain;
+	spin_lock(&tomoyo_query_list_lock);
+	if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
+	    tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
+	    >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
+		quota_exceeded = true;
+	} else {
+		entry.serial = tomoyo_serial++;
+		entry.retry = r->retry;
+		tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
+		list_add_tail(&entry.list, &tomoyo_query_list);
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	if (quota_exceeded)
+		goto out;
+	/* Give 10 seconds for supervisor's opinion. */
+	while (entry.timer < 10) {
+		wake_up_all(&tomoyo_query_wait);
+		if (wait_event_interruptible_timeout
+		    (tomoyo_answer_wait, entry.answer ||
+		     !atomic_read(&tomoyo_query_observers), HZ))
+			break;
+		entry.timer++;
+	}
+	spin_lock(&tomoyo_query_list_lock);
+	list_del(&entry.list);
+	tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
+	spin_unlock(&tomoyo_query_list_lock);
+	switch (entry.answer) {
+	case 3: /* Asked to retry by administrator. */
+		error = TOMOYO_RETRY_REQUEST;
+		r->retry++;
+		break;
+	case 1:
+		/* Granted by administrator. */
+		error = 0;
+		break;
+	default:
+		/* Timed out or rejected by administrator. */
+		break;
+	}
+out:
+	kfree(entry.query);
+	return error;
+}
+
+/**
+ * tomoyo_find_domain_by_qid - Get domain by query id.
+ *
+ * @serial: Query ID assigned by tomoyo_supervisor().
+ *
+ * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
+ */
+static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
+(unsigned int serial)
+{
+	struct tomoyo_query *ptr;
+	struct tomoyo_domain_info *domain = NULL;
+
+	spin_lock(&tomoyo_query_list_lock);
+	list_for_each_entry(ptr, &tomoyo_query_list, list) {
+		if (ptr->serial != serial)
+			continue;
+		domain = ptr->domain;
+		break;
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	return domain;
+}
+
+/**
+ * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
+ *
+ * @file: Pointer to "struct file".
+ * @wait: Pointer to "poll_table".
+ *
+ * Returns EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise.
+ *
+ * Waits for access requests which violated policy in enforcing mode.
+ */
+static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
+{
+	if (!list_empty(&tomoyo_query_list))
+		return EPOLLIN | EPOLLRDNORM;
+	poll_wait(file, &tomoyo_query_wait, wait);
+	if (!list_empty(&tomoyo_query_list))
+		return EPOLLIN | EPOLLRDNORM;
+	return 0;
+}
+
+/**
+ * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ */
+static void tomoyo_read_query(struct tomoyo_io_buffer *head)
+	__must_hold(&head->io_sem)
+{
+	struct list_head *tmp;
+	unsigned int pos = 0;
+	size_t len = 0;
+	char *buf;
+
+	if (head->r.w_pos)
+		return;
+	kfree(head->read_buf);
+	head->read_buf = NULL;
+	spin_lock(&tomoyo_query_list_lock);
+	list_for_each(tmp, &tomoyo_query_list) {
+		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
+
+		if (pos++ != head->r.query_index)
+			continue;
+		len = ptr->query_len;
+		break;
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	if (!len) {
+		head->r.query_index = 0;
+		return;
+	}
+	buf = kzalloc(len + 32, GFP_NOFS);
+	if (!buf)
+		return;
+	pos = 0;
+	spin_lock(&tomoyo_query_list_lock);
+	list_for_each(tmp, &tomoyo_query_list) {
+		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
+
+		if (pos++ != head->r.query_index)
+			continue;
+		/*
+		 * Some query can be skipped because tomoyo_query_list
+		 * can change, but I don't care.
+		 */
+		if (len == ptr->query_len)
+			snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
+				 ptr->retry, ptr->query);
+		break;
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	if (buf[0]) {
+		head->read_buf = buf;
+		head->r.w[head->r.w_pos++] = buf;
+		head->r.query_index++;
+	} else {
+		kfree(buf);
+	}
+}
+
+/**
+ * tomoyo_write_answer - Write the supervisor's decision.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, -EINVAL otherwise.
+ */
+static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
+	__must_hold(&head->io_sem)
+{
+	char *data = head->write_buf;
+	struct list_head *tmp;
+	unsigned int serial;
+	unsigned int answer;
+
+	spin_lock(&tomoyo_query_list_lock);
+	list_for_each(tmp, &tomoyo_query_list) {
+		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
+
+		ptr->timer = 0;
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
+		return -EINVAL;
+	spin_lock(&tomoyo_query_list_lock);
+	list_for_each(tmp, &tomoyo_query_list) {
+		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
+
+		if (ptr->serial != serial)
+			continue;
+		ptr->answer = answer;
+		/* Remove from tomoyo_query_list. */
+		if (ptr->answer)
+			list_del_init(&ptr->list);
+		break;
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	return 0;
+}
+
+/**
+ * tomoyo_read_version: Get version.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns version information.
+ */
+static void tomoyo_read_version(struct tomoyo_io_buffer *head)
+	__must_hold(&head->io_sem)
+{
+	if (!head->r.eof) {
+		tomoyo_io_printf(head, "2.6.0");
+		head->r.eof = true;
+	}
+}
+
+/* String table for /sys/kernel/security/tomoyo/stat interface. */
+static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
+	[TOMOYO_STAT_POLICY_UPDATES]    = "update:",
+	[TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
+	[TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
+	[TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
+};
+
+/* String table for /sys/kernel/security/tomoyo/stat interface. */
+static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
+	[TOMOYO_MEMORY_POLICY] = "policy:",
+	[TOMOYO_MEMORY_AUDIT]  = "audit log:",
+	[TOMOYO_MEMORY_QUERY]  = "query message:",
+};
+
+/* Counter for number of updates. */
+static atomic_t tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
+/* Timestamp counter for last updated. */
+static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
+
+/**
+ * tomoyo_update_stat - Update statistic counters.
+ *
+ * @index: Index for policy type.
+ *
+ * Returns nothing.
+ */
+void tomoyo_update_stat(const u8 index)
+{
+	atomic_inc(&tomoyo_stat_updated[index]);
+	tomoyo_stat_modified[index] = ktime_get_real_seconds();
+}
+
+/**
+ * tomoyo_read_stat - Read statistic data.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
+	__must_hold(&head->io_sem)
+{
+	u8 i;
+	unsigned int total = 0;
+
+	if (head->r.eof)
+		return;
+	for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
+		tomoyo_io_printf(head, "Policy %-30s %10u",
+				 tomoyo_policy_headers[i],
+				 atomic_read(&tomoyo_stat_updated[i]));
+		if (tomoyo_stat_modified[i]) {
+			struct tomoyo_time stamp;
+
+			tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
+			tomoyo_io_printf(head, " (Last: %04u/%02u/%02u %02u:%02u:%02u)",
+					 stamp.year, stamp.month, stamp.day,
+					 stamp.hour, stamp.min, stamp.sec);
+		}
+		tomoyo_set_lf(head);
+	}
+	for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
+		unsigned int used = tomoyo_memory_used[i];
+
+		total += used;
+		tomoyo_io_printf(head, "Memory used by %-22s %10u",
+				 tomoyo_memory_headers[i], used);
+		used = tomoyo_memory_quota[i];
+		if (used)
+			tomoyo_io_printf(head, " (Quota: %10u)", used);
+		tomoyo_set_lf(head);
+	}
+	tomoyo_io_printf(head, "Total memory used:                    %10u\n",
+			 total);
+	head->r.eof = true;
+}
+
+/**
+ * tomoyo_write_stat - Set memory quota.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0.
+ */
+static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
+	__must_hold(&head->io_sem)
+{
+	char *data = head->write_buf;
+	u8 i;
+
+	if (tomoyo_str_starts(&data, "Memory used by "))
+		for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
+			if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
+				sscanf(data, "%u", &tomoyo_memory_quota[i]);
+	return 0;
+}
+
+/**
+ * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @type: Type of interface.
+ * @file: Pointer to "struct file".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_open_control(const u8 type, struct file *file)
+{
+	struct tomoyo_io_buffer *head = kzalloc_obj(*head, GFP_NOFS);
+
+	if (!head)
+		return -ENOMEM;
+	guard(mutex_init)(&head->io_sem);
+	head->type = type;
+	switch (type) {
+	case TOMOYO_DOMAINPOLICY:
+		/* /sys/kernel/security/tomoyo/domain_policy */
+		head->write = tomoyo_write_domain;
+		head->read = tomoyo_read_domain;
+		break;
+	case TOMOYO_EXCEPTIONPOLICY:
+		/* /sys/kernel/security/tomoyo/exception_policy */
+		head->write = tomoyo_write_exception;
+		head->read = tomoyo_read_exception;
+		break;
+	case TOMOYO_AUDIT:
+		/* /sys/kernel/security/tomoyo/audit */
+		head->poll = tomoyo_poll_log;
+		head->read = tomoyo_read_log;
+		break;
+	case TOMOYO_PROCESS_STATUS:
+		/* /sys/kernel/security/tomoyo/.process_status */
+		head->write = tomoyo_write_pid;
+		head->read = tomoyo_read_pid;
+		break;
+	case TOMOYO_VERSION:
+		/* /sys/kernel/security/tomoyo/version */
+		head->read = tomoyo_read_version;
+		head->readbuf_size = 128;
+		break;
+	case TOMOYO_STAT:
+		/* /sys/kernel/security/tomoyo/stat */
+		head->write = tomoyo_write_stat;
+		head->read = tomoyo_read_stat;
+		head->readbuf_size = 1024;
+		break;
+	case TOMOYO_PROFILE:
+		/* /sys/kernel/security/tomoyo/profile */
+		head->write = tomoyo_write_profile;
+		head->read = tomoyo_read_profile;
+		break;
+	case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
+		head->poll = tomoyo_poll_query;
+		head->write = tomoyo_write_answer;
+		head->read = tomoyo_read_query;
+		break;
+	case TOMOYO_MANAGER:
+		/* /sys/kernel/security/tomoyo/manager */
+		head->write = tomoyo_write_manager;
+		head->read = tomoyo_read_manager;
+		break;
+	}
+	if (!(file->f_mode & FMODE_READ)) {
+		/*
+		 * No need to allocate read_buf since it is not opened
+		 * for reading.
+		 */
+		head->read = NULL;
+		head->poll = NULL;
+	} else if (!head->poll) {
+		/* Don't allocate read_buf for poll() access. */
+		if (!head->readbuf_size)
+			head->readbuf_size = 4096 * 2;
+		head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
+		if (!head->read_buf) {
+			kfree(head);
+			return -ENOMEM;
+		}
+	}
+	if (!(file->f_mode & FMODE_WRITE)) {
+		/*
+		 * No need to allocate write_buf since it is not opened
+		 * for writing.
+		 */
+		head->write = NULL;
+	} else if (head->write) {
+		head->writebuf_size = 4096 * 2;
+		head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
+		if (!head->write_buf) {
+			kfree(head->read_buf);
+			kfree(head);
+			return -ENOMEM;
+		}
+	}
+	/*
+	 * If the file is /sys/kernel/security/tomoyo/query , increment the
+	 * observer counter.
+	 * The obserber counter is used by tomoyo_supervisor() to see if
+	 * there is some process monitoring /sys/kernel/security/tomoyo/query.
+	 */
+	if (type == TOMOYO_QUERY)
+		atomic_inc(&tomoyo_query_observers);
+	file->private_data = head;
+	tomoyo_notify_gc(head, true);
+	return 0;
+}
+
+/**
+ * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @wait: Pointer to "poll_table". Maybe NULL.
+ *
+ * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
+ * EPOLLOUT | EPOLLWRNORM otherwise.
+ */
+__poll_t tomoyo_poll_control(struct file *file, poll_table *wait)
+{
+	struct tomoyo_io_buffer *head = file->private_data;
+
+	if (head->poll)
+		return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM;
+	return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM;
+}
+
+/**
+ * tomoyo_set_namespace_cursor - Set namespace to read.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
+{
+	struct list_head *ns;
+
+	if (head->type != TOMOYO_EXCEPTIONPOLICY &&
+	    head->type != TOMOYO_PROFILE)
+		return;
+	/*
+	 * If this is the first read, or reading previous namespace finished
+	 * and has more namespaces to read, update the namespace cursor.
+	 */
+	ns = head->r.ns;
+	if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
+		/* Clearing is OK because tomoyo_flush() returned true. */
+		memset(&head->r, 0, sizeof(head->r));
+		head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
+	}
+}
+
+/**
+ * tomoyo_has_more_namespace - Check for unread namespaces.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns true if we have more entries to print, false otherwise.
+ */
+static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
+{
+	return (head->type == TOMOYO_EXCEPTIONPOLICY ||
+		head->type == TOMOYO_PROFILE) && head->r.eof &&
+		head->r.ns->next != &tomoyo_namespace_list;
+}
+
+/**
+ * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @head:       Pointer to "struct tomoyo_io_buffer".
+ * @buffer:     Pointer to buffer to write to.
+ * @buffer_len: Size of @buffer.
+ *
+ * Returns bytes read on success, negative value otherwise.
+ */
+ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
+			    const int buffer_len)
+{
+	int len;
+	int idx;
+
+	if (!head->read)
+		return -EINVAL;
+	if (mutex_lock_interruptible(&head->io_sem))
+		return -EINTR;
+	head->read_user_buf = buffer;
+	head->read_user_buf_avail = buffer_len;
+	idx = tomoyo_read_lock();
+	if (tomoyo_flush(head))
+		/* Call the policy handler. */
+		do {
+			tomoyo_set_namespace_cursor(head);
+			head->read(head);
+		} while (tomoyo_flush(head) &&
+			 tomoyo_has_more_namespace(head));
+	tomoyo_read_unlock(idx);
+	len = head->read_user_buf - buffer;
+	mutex_unlock(&head->io_sem);
+	return len;
+}
+
+/**
+ * tomoyo_parse_policy - Parse a policy line.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @line: Line to parse.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
+	__must_hold_shared(&tomoyo_ss)
+	__must_hold(&head->io_sem)
+{
+	/* Delete request? */
+	head->w.is_delete = !strncmp(line, "delete ", 7);
+	if (head->w.is_delete)
+		memmove(line, line + 7, strlen(line + 7) + 1);
+	/* Selecting namespace to update. */
+	if (head->type == TOMOYO_EXCEPTIONPOLICY ||
+	    head->type == TOMOYO_PROFILE) {
+		if (*line == '<') {
+			char *cp = strchr(line, ' ');
+
+			if (cp) {
+				*cp++ = '\0';
+				head->w.ns = tomoyo_assign_namespace(line);
+				memmove(line, cp, strlen(cp) + 1);
+			} else
+				head->w.ns = NULL;
+		} else
+			head->w.ns = &tomoyo_kernel_namespace;
+		/* Don't allow updating if namespace is invalid. */
+		if (!head->w.ns)
+			return -ENOENT;
+	}
+	/* Do the update. */
+	return head->write(head);
+}
+
+/**
+ * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @head:       Pointer to "struct tomoyo_io_buffer".
+ * @buffer:     Pointer to buffer to read from.
+ * @buffer_len: Size of @buffer.
+ *
+ * Returns @buffer_len on success, negative value otherwise.
+ */
+ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
+			     const char __user *buffer, const int buffer_len)
+{
+	int error = buffer_len;
+	size_t avail_len = buffer_len;
+	char *cp0;
+	int idx;
+
+	if (!head->write)
+		return -EINVAL;
+	if (mutex_lock_interruptible(&head->io_sem))
+		return -EINTR;
+	cp0 = head->write_buf;
+	head->read_user_buf_avail = 0;
+	idx = tomoyo_read_lock();
+	/* Read a line and dispatch it to the policy handler. */
+	while (avail_len > 0) {
+		char c;
+
+		if (head->w.avail >= head->writebuf_size - 1) {
+			const int len = head->writebuf_size * 2;
+			char *cp = kzalloc(len, GFP_NOFS | __GFP_NOWARN);
+
+			if (!cp) {
+				error = -ENOMEM;
+				break;
+			}
+			memmove(cp, cp0, head->w.avail);
+			kfree(cp0);
+			head->write_buf = cp;
+			cp0 = cp;
+			head->writebuf_size = len;
+		}
+		if (get_user(c, buffer)) {
+			error = -EFAULT;
+			break;
+		}
+		buffer++;
+		avail_len--;
+		cp0[head->w.avail++] = c;
+		if (c != '\n')
+			continue;
+		cp0[head->w.avail - 1] = '\0';
+		head->w.avail = 0;
+		tomoyo_normalize_line(cp0);
+		if (!strcmp(cp0, "reset")) {
+			head->w.ns = &tomoyo_kernel_namespace;
+			head->w.domain = NULL;
+			memset(&head->r, 0, sizeof(head->r));
+			continue;
+		}
+		/* Don't allow updating policies by non manager programs. */
+		switch (head->type) {
+		case TOMOYO_PROCESS_STATUS:
+			/* This does not write anything. */
+			break;
+		case TOMOYO_DOMAINPOLICY:
+			if (tomoyo_select_domain(head, cp0))
+				continue;
+			fallthrough;
+		case TOMOYO_EXCEPTIONPOLICY:
+			if (!strcmp(cp0, "select transition_only")) {
+				head->r.print_transition_related_only = true;
+				continue;
+			}
+			fallthrough;
+		default:
+			if (!tomoyo_manager()) {
+				error = -EPERM;
+				goto out;
+			}
+		}
+		switch (tomoyo_parse_policy(head, cp0)) {
+		case -EPERM:
+			error = -EPERM;
+			goto out;
+		case 0:
+			switch (head->type) {
+			case TOMOYO_DOMAINPOLICY:
+			case TOMOYO_EXCEPTIONPOLICY:
+			case TOMOYO_STAT:
+			case TOMOYO_PROFILE:
+			case TOMOYO_MANAGER:
+				tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
+				break;
+			default:
+				break;
+			}
+			break;
+		}
+	}
+out:
+	tomoyo_read_unlock(idx);
+	mutex_unlock(&head->io_sem);
+	return error;
+}
+
+/**
+ * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ */
+void tomoyo_close_control(struct tomoyo_io_buffer *head)
+{
+	/*
+	 * If the file is /sys/kernel/security/tomoyo/query , decrement the
+	 * observer counter.
+	 */
+	if (head->type == TOMOYO_QUERY &&
+	    atomic_dec_and_test(&tomoyo_query_observers))
+		wake_up_all(&tomoyo_answer_wait);
+	tomoyo_notify_gc(head, false);
+}
+
+/**
+ * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
+ */
+void tomoyo_check_profile(void)
+{
+	struct tomoyo_domain_info *domain;
+	const int idx = tomoyo_read_lock();
+
+	tomoyo_policy_loaded = true;
+	pr_info("TOMOYO: 2.6.0\n");
+	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		const u8 profile = domain->profile;
+		struct tomoyo_policy_namespace *ns = domain->ns;
+
+		if (ns->profile_version == 20110903) {
+			pr_info_once("Converting profile version from %u to %u.\n",
+				     20110903, 20150505);
+			ns->profile_version = 20150505;
+		}
+		if (ns->profile_version != 20150505)
+			pr_err("Profile version %u is not supported.\n",
+			       ns->profile_version);
+		else if (!ns->profile_ptr[profile])
+			pr_err("Profile %u (used by '%s') is not defined.\n",
+			       profile, domain->domainname->name);
+		else
+			continue;
+		pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n");
+		pr_err("Please see https://tomoyo.sourceforge.net/2.6/ for more information.\n");
+		panic("STOP!");
+	}
+	tomoyo_read_unlock(idx);
+	pr_info("Mandatory Access Control activated.\n");
+}
+
+/**
+ * tomoyo_load_builtin_policy - Load built-in policy.
+ *
+ * Returns nothing.
+ */
+void __init tomoyo_load_builtin_policy(void)
+{
+#ifdef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
+	static char tomoyo_builtin_profile[] __initdata =
+		"PROFILE_VERSION=20150505\n"
+		"0-CONFIG={ mode=learning grant_log=no reject_log=yes }\n";
+	static char tomoyo_builtin_exception_policy[] __initdata =
+		"aggregator proc:/self/exe /proc/self/exe\n";
+	static char tomoyo_builtin_domain_policy[] __initdata = "";
+	static char tomoyo_builtin_manager[] __initdata = "";
+	static char tomoyo_builtin_stat[] __initdata = "";
+#else
+	/*
+	 * This include file is manually created and contains built-in policy
+	 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
+	 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
+	 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
+	 */
+#include "builtin-policy.h"
+#endif
+	u8 i;
+	const int idx = tomoyo_read_lock();
+
+	for (i = 0; i < 5; i++) {
+		struct tomoyo_io_buffer head = { };
+		char *start = "";
+
+		switch (i) {
+		case 0:
+			start = tomoyo_builtin_profile;
+			head.type = TOMOYO_PROFILE;
+			head.write = tomoyo_write_profile;
+			break;
+		case 1:
+			start = tomoyo_builtin_exception_policy;
+			head.type = TOMOYO_EXCEPTIONPOLICY;
+			head.write = tomoyo_write_exception;
+			break;
+		case 2:
+			start = tomoyo_builtin_domain_policy;
+			head.type = TOMOYO_DOMAINPOLICY;
+			head.write = tomoyo_write_domain;
+			break;
+		case 3:
+			start = tomoyo_builtin_manager;
+			head.type = TOMOYO_MANAGER;
+			head.write = tomoyo_write_manager;
+			break;
+		case 4:
+			start = tomoyo_builtin_stat;
+			head.type = TOMOYO_STAT;
+			head.write = tomoyo_write_stat;
+			break;
+		}
+		while (1) {
+			char *end = strchr(start, '\n');
+
+			if (!end)
+				break;
+			*end = '\0';
+			tomoyo_normalize_line(start);
+			/* head is stack-local and not shared. */
+			context_unsafe(
+				head.write_buf = start;
+				tomoyo_parse_policy(&head, start);
+			);
+			start = end + 1;
+		}
+	}
+	tomoyo_read_unlock(idx);
+#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
+	tomoyo_check_profile();
+#endif
+}
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
new file mode 100644
index 000000000..d098cf8aa
--- /dev/null
+++ b/security/tomoyo/common.h
@@ -0,0 +1,1292 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * security/tomoyo/common.h
+ *
+ * Header file for TOMOYO.
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#ifndef _SECURITY_TOMOYO_COMMON_H
+#define _SECURITY_TOMOYO_COMMON_H
+
+#define pr_fmt(fmt) fmt
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/file.h>
+#include <linux/kmod.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/list.h>
+#include <linux/cred.h>
+#include <linux/poll.h>
+#include <linux/binfmts.h>
+#include <linux/highmem.h>
+#include <linux/net.h>
+#include <linux/inet.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/un.h>
+#include <linux/lsm_hooks.h>
+#include <net/sock.h>
+#include <net/af_unix.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/udp.h>
+
+/********** Constants definitions. **********/
+
+/*
+ * TOMOYO uses this hash only when appending a string into the string
+ * table. Frequency of appending strings is very low. So we don't need
+ * large (e.g. 64k) hash size. 256 will be sufficient.
+ */
+#define TOMOYO_HASH_BITS  8
+#define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS)
+
+/*
+ * TOMOYO checks only SOCK_STREAM, SOCK_DGRAM, SOCK_RAW, SOCK_SEQPACKET.
+ * Therefore, we don't need SOCK_MAX.
+ */
+#define TOMOYO_SOCK_MAX 6
+
+#define TOMOYO_EXEC_TMPSIZE     4096
+
+/* Garbage collector is trying to kfree() this element. */
+#define TOMOYO_GC_IN_PROGRESS -1
+
+/* Profile number is an integer between 0 and 255. */
+#define TOMOYO_MAX_PROFILES 256
+
+/* Group number is an integer between 0 and 255. */
+#define TOMOYO_MAX_ACL_GROUPS 256
+
+/* Index numbers for "struct tomoyo_condition". */
+enum tomoyo_conditions_index {
+	TOMOYO_TASK_UID,             /* current_uid()   */
+	TOMOYO_TASK_EUID,            /* current_euid()  */
+	TOMOYO_TASK_SUID,            /* current_suid()  */
+	TOMOYO_TASK_FSUID,           /* current_fsuid() */
+	TOMOYO_TASK_GID,             /* current_gid()   */
+	TOMOYO_TASK_EGID,            /* current_egid()  */
+	TOMOYO_TASK_SGID,            /* current_sgid()  */
+	TOMOYO_TASK_FSGID,           /* current_fsgid() */
+	TOMOYO_TASK_PID,             /* sys_getpid()   */
+	TOMOYO_TASK_PPID,            /* sys_getppid()  */
+	TOMOYO_EXEC_ARGC,            /* "struct linux_binprm *"->argc */
+	TOMOYO_EXEC_ENVC,            /* "struct linux_binprm *"->envc */
+	TOMOYO_TYPE_IS_SOCKET,       /* S_IFSOCK */
+	TOMOYO_TYPE_IS_SYMLINK,      /* S_IFLNK */
+	TOMOYO_TYPE_IS_FILE,         /* S_IFREG */
+	TOMOYO_TYPE_IS_BLOCK_DEV,    /* S_IFBLK */
+	TOMOYO_TYPE_IS_DIRECTORY,    /* S_IFDIR */
+	TOMOYO_TYPE_IS_CHAR_DEV,     /* S_IFCHR */
+	TOMOYO_TYPE_IS_FIFO,         /* S_IFIFO */
+	TOMOYO_MODE_SETUID,          /* S_ISUID */
+	TOMOYO_MODE_SETGID,          /* S_ISGID */
+	TOMOYO_MODE_STICKY,          /* S_ISVTX */
+	TOMOYO_MODE_OWNER_READ,      /* S_IRUSR */
+	TOMOYO_MODE_OWNER_WRITE,     /* S_IWUSR */
+	TOMOYO_MODE_OWNER_EXECUTE,   /* S_IXUSR */
+	TOMOYO_MODE_GROUP_READ,      /* S_IRGRP */
+	TOMOYO_MODE_GROUP_WRITE,     /* S_IWGRP */
+	TOMOYO_MODE_GROUP_EXECUTE,   /* S_IXGRP */
+	TOMOYO_MODE_OTHERS_READ,     /* S_IROTH */
+	TOMOYO_MODE_OTHERS_WRITE,    /* S_IWOTH */
+	TOMOYO_MODE_OTHERS_EXECUTE,  /* S_IXOTH */
+	TOMOYO_EXEC_REALPATH,
+	TOMOYO_SYMLINK_TARGET,
+	TOMOYO_PATH1_UID,
+	TOMOYO_PATH1_GID,
+	TOMOYO_PATH1_INO,
+	TOMOYO_PATH1_MAJOR,
+	TOMOYO_PATH1_MINOR,
+	TOMOYO_PATH1_PERM,
+	TOMOYO_PATH1_TYPE,
+	TOMOYO_PATH1_DEV_MAJOR,
+	TOMOYO_PATH1_DEV_MINOR,
+	TOMOYO_PATH2_UID,
+	TOMOYO_PATH2_GID,
+	TOMOYO_PATH2_INO,
+	TOMOYO_PATH2_MAJOR,
+	TOMOYO_PATH2_MINOR,
+	TOMOYO_PATH2_PERM,
+	TOMOYO_PATH2_TYPE,
+	TOMOYO_PATH2_DEV_MAJOR,
+	TOMOYO_PATH2_DEV_MINOR,
+	TOMOYO_PATH1_PARENT_UID,
+	TOMOYO_PATH1_PARENT_GID,
+	TOMOYO_PATH1_PARENT_INO,
+	TOMOYO_PATH1_PARENT_PERM,
+	TOMOYO_PATH2_PARENT_UID,
+	TOMOYO_PATH2_PARENT_GID,
+	TOMOYO_PATH2_PARENT_INO,
+	TOMOYO_PATH2_PARENT_PERM,
+	TOMOYO_MAX_CONDITION_KEYWORD,
+	TOMOYO_NUMBER_UNION,
+	TOMOYO_NAME_UNION,
+	TOMOYO_ARGV_ENTRY,
+	TOMOYO_ENVP_ENTRY,
+};
+
+
+/* Index numbers for stat(). */
+enum tomoyo_path_stat_index {
+	/* Do not change this order. */
+	TOMOYO_PATH1,
+	TOMOYO_PATH1_PARENT,
+	TOMOYO_PATH2,
+	TOMOYO_PATH2_PARENT,
+	TOMOYO_MAX_PATH_STAT
+};
+
+/* Index numbers for operation mode. */
+enum tomoyo_mode_index {
+	TOMOYO_CONFIG_DISABLED,
+	TOMOYO_CONFIG_LEARNING,
+	TOMOYO_CONFIG_PERMISSIVE,
+	TOMOYO_CONFIG_ENFORCING,
+	TOMOYO_CONFIG_MAX_MODE,
+	TOMOYO_CONFIG_WANT_REJECT_LOG =  64,
+	TOMOYO_CONFIG_WANT_GRANT_LOG  = 128,
+	TOMOYO_CONFIG_USE_DEFAULT     = 255,
+};
+
+/* Index numbers for entry type. */
+enum tomoyo_policy_id {
+	TOMOYO_ID_GROUP,
+	TOMOYO_ID_ADDRESS_GROUP,
+	TOMOYO_ID_PATH_GROUP,
+	TOMOYO_ID_NUMBER_GROUP,
+	TOMOYO_ID_TRANSITION_CONTROL,
+	TOMOYO_ID_AGGREGATOR,
+	TOMOYO_ID_MANAGER,
+	TOMOYO_ID_CONDITION,
+	TOMOYO_ID_NAME,
+	TOMOYO_ID_ACL,
+	TOMOYO_ID_DOMAIN,
+	TOMOYO_MAX_POLICY
+};
+
+/* Index numbers for domain's attributes. */
+enum tomoyo_domain_info_flags_index {
+	/* Quota warnning flag.   */
+	TOMOYO_DIF_QUOTA_WARNED,
+	/*
+	 * This domain was unable to create a new domain at
+	 * tomoyo_find_next_domain() because the name of the domain to be
+	 * created was too long or it could not allocate memory.
+	 * More than one process continued execve() without domain transition.
+	 */
+	TOMOYO_DIF_TRANSITION_FAILED,
+	TOMOYO_MAX_DOMAIN_INFO_FLAGS
+};
+
+/* Index numbers for audit type. */
+enum tomoyo_grant_log {
+	/* Follow profile's configuration. */
+	TOMOYO_GRANTLOG_AUTO,
+	/* Do not generate grant log. */
+	TOMOYO_GRANTLOG_NO,
+	/* Generate grant_log. */
+	TOMOYO_GRANTLOG_YES,
+};
+
+/* Index numbers for group entries. */
+enum tomoyo_group_id {
+	TOMOYO_PATH_GROUP,
+	TOMOYO_NUMBER_GROUP,
+	TOMOYO_ADDRESS_GROUP,
+	TOMOYO_MAX_GROUP
+};
+
+/* Index numbers for type of numeric values. */
+enum tomoyo_value_type {
+	TOMOYO_VALUE_TYPE_INVALID,
+	TOMOYO_VALUE_TYPE_DECIMAL,
+	TOMOYO_VALUE_TYPE_OCTAL,
+	TOMOYO_VALUE_TYPE_HEXADECIMAL,
+};
+
+/* Index numbers for domain transition control keywords. */
+enum tomoyo_transition_type {
+	/* Do not change this order, */
+	TOMOYO_TRANSITION_CONTROL_NO_RESET,
+	TOMOYO_TRANSITION_CONTROL_RESET,
+	TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE,
+	TOMOYO_TRANSITION_CONTROL_INITIALIZE,
+	TOMOYO_TRANSITION_CONTROL_NO_KEEP,
+	TOMOYO_TRANSITION_CONTROL_KEEP,
+	TOMOYO_MAX_TRANSITION_TYPE
+};
+
+/* Index numbers for Access Controls. */
+enum tomoyo_acl_entry_type_index {
+	TOMOYO_TYPE_PATH_ACL,
+	TOMOYO_TYPE_PATH2_ACL,
+	TOMOYO_TYPE_PATH_NUMBER_ACL,
+	TOMOYO_TYPE_MKDEV_ACL,
+	TOMOYO_TYPE_MOUNT_ACL,
+	TOMOYO_TYPE_INET_ACL,
+	TOMOYO_TYPE_UNIX_ACL,
+	TOMOYO_TYPE_ENV_ACL,
+	TOMOYO_TYPE_MANUAL_TASK_ACL,
+};
+
+/* Index numbers for access controls with one pathname. */
+enum tomoyo_path_acl_index {
+	TOMOYO_TYPE_EXECUTE,
+	TOMOYO_TYPE_READ,
+	TOMOYO_TYPE_WRITE,
+	TOMOYO_TYPE_APPEND,
+	TOMOYO_TYPE_UNLINK,
+	TOMOYO_TYPE_GETATTR,
+	TOMOYO_TYPE_RMDIR,
+	TOMOYO_TYPE_TRUNCATE,
+	TOMOYO_TYPE_SYMLINK,
+	TOMOYO_TYPE_CHROOT,
+	TOMOYO_TYPE_UMOUNT,
+	TOMOYO_MAX_PATH_OPERATION
+};
+
+/* Index numbers for /sys/kernel/security/tomoyo/stat interface. */
+enum tomoyo_memory_stat_type {
+	TOMOYO_MEMORY_POLICY,
+	TOMOYO_MEMORY_AUDIT,
+	TOMOYO_MEMORY_QUERY,
+	TOMOYO_MAX_MEMORY_STAT
+};
+
+enum tomoyo_mkdev_acl_index {
+	TOMOYO_TYPE_MKBLOCK,
+	TOMOYO_TYPE_MKCHAR,
+	TOMOYO_MAX_MKDEV_OPERATION
+};
+
+/* Index numbers for socket operations. */
+enum tomoyo_network_acl_index {
+	TOMOYO_NETWORK_BIND,    /* bind() operation. */
+	TOMOYO_NETWORK_LISTEN,  /* listen() operation. */
+	TOMOYO_NETWORK_CONNECT, /* connect() operation. */
+	TOMOYO_NETWORK_SEND,    /* send() operation. */
+	TOMOYO_MAX_NETWORK_OPERATION
+};
+
+/* Index numbers for access controls with two pathnames. */
+enum tomoyo_path2_acl_index {
+	TOMOYO_TYPE_LINK,
+	TOMOYO_TYPE_RENAME,
+	TOMOYO_TYPE_PIVOT_ROOT,
+	TOMOYO_MAX_PATH2_OPERATION
+};
+
+/* Index numbers for access controls with one pathname and one number. */
+enum tomoyo_path_number_acl_index {
+	TOMOYO_TYPE_CREATE,
+	TOMOYO_TYPE_MKDIR,
+	TOMOYO_TYPE_MKFIFO,
+	TOMOYO_TYPE_MKSOCK,
+	TOMOYO_TYPE_IOCTL,
+	TOMOYO_TYPE_CHMOD,
+	TOMOYO_TYPE_CHOWN,
+	TOMOYO_TYPE_CHGRP,
+	TOMOYO_MAX_PATH_NUMBER_OPERATION
+};
+
+/* Index numbers for /sys/kernel/security/tomoyo/ interfaces. */
+enum tomoyo_securityfs_interface_index {
+	TOMOYO_DOMAINPOLICY,
+	TOMOYO_EXCEPTIONPOLICY,
+	TOMOYO_PROCESS_STATUS,
+	TOMOYO_STAT,
+	TOMOYO_AUDIT,
+	TOMOYO_VERSION,
+	TOMOYO_PROFILE,
+	TOMOYO_QUERY,
+	TOMOYO_MANAGER
+};
+
+/* Index numbers for special mount operations. */
+enum tomoyo_special_mount {
+	TOMOYO_MOUNT_BIND,            /* mount --bind /source /dest   */
+	TOMOYO_MOUNT_MOVE,            /* mount --move /old /new       */
+	TOMOYO_MOUNT_REMOUNT,         /* mount -o remount /dir        */
+	TOMOYO_MOUNT_MAKE_UNBINDABLE, /* mount --make-unbindable /dir */
+	TOMOYO_MOUNT_MAKE_PRIVATE,    /* mount --make-private /dir    */
+	TOMOYO_MOUNT_MAKE_SLAVE,      /* mount --make-slave /dir      */
+	TOMOYO_MOUNT_MAKE_SHARED,     /* mount --make-shared /dir     */
+	TOMOYO_MAX_SPECIAL_MOUNT
+};
+
+/* Index numbers for functionality. */
+enum tomoyo_mac_index {
+	TOMOYO_MAC_FILE_EXECUTE,
+	TOMOYO_MAC_FILE_OPEN,
+	TOMOYO_MAC_FILE_CREATE,
+	TOMOYO_MAC_FILE_UNLINK,
+	TOMOYO_MAC_FILE_GETATTR,
+	TOMOYO_MAC_FILE_MKDIR,
+	TOMOYO_MAC_FILE_RMDIR,
+	TOMOYO_MAC_FILE_MKFIFO,
+	TOMOYO_MAC_FILE_MKSOCK,
+	TOMOYO_MAC_FILE_TRUNCATE,
+	TOMOYO_MAC_FILE_SYMLINK,
+	TOMOYO_MAC_FILE_MKBLOCK,
+	TOMOYO_MAC_FILE_MKCHAR,
+	TOMOYO_MAC_FILE_LINK,
+	TOMOYO_MAC_FILE_RENAME,
+	TOMOYO_MAC_FILE_CHMOD,
+	TOMOYO_MAC_FILE_CHOWN,
+	TOMOYO_MAC_FILE_CHGRP,
+	TOMOYO_MAC_FILE_IOCTL,
+	TOMOYO_MAC_FILE_CHROOT,
+	TOMOYO_MAC_FILE_MOUNT,
+	TOMOYO_MAC_FILE_UMOUNT,
+	TOMOYO_MAC_FILE_PIVOT_ROOT,
+	TOMOYO_MAC_NETWORK_INET_STREAM_BIND,
+	TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN,
+	TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT,
+	TOMOYO_MAC_NETWORK_INET_DGRAM_BIND,
+	TOMOYO_MAC_NETWORK_INET_DGRAM_SEND,
+	TOMOYO_MAC_NETWORK_INET_RAW_BIND,
+	TOMOYO_MAC_NETWORK_INET_RAW_SEND,
+	TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND,
+	TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN,
+	TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT,
+	TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND,
+	TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND,
+	TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND,
+	TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN,
+	TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT,
+	TOMOYO_MAC_ENVIRON,
+	TOMOYO_MAX_MAC_INDEX
+};
+
+/* Index numbers for category of functionality. */
+enum tomoyo_mac_category_index {
+	TOMOYO_MAC_CATEGORY_FILE,
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	TOMOYO_MAC_CATEGORY_MISC,
+	TOMOYO_MAX_MAC_CATEGORY_INDEX
+};
+
+/*
+ * Retry this request. Returned by tomoyo_supervisor() if policy violation has
+ * occurred in enforcing mode and the userspace daemon decided to retry.
+ *
+ * We must choose a positive value in order to distinguish "granted" (which is
+ * 0) and "rejected" (which is a negative value) and "retry".
+ */
+#define TOMOYO_RETRY_REQUEST 1
+
+/* Index numbers for /sys/kernel/security/tomoyo/stat interface. */
+enum tomoyo_policy_stat_type {
+	/* Do not change this order. */
+	TOMOYO_STAT_POLICY_UPDATES,
+	TOMOYO_STAT_POLICY_LEARNING,   /* == TOMOYO_CONFIG_LEARNING */
+	TOMOYO_STAT_POLICY_PERMISSIVE, /* == TOMOYO_CONFIG_PERMISSIVE */
+	TOMOYO_STAT_POLICY_ENFORCING,  /* == TOMOYO_CONFIG_ENFORCING */
+	TOMOYO_MAX_POLICY_STAT
+};
+
+/* Index numbers for profile's PREFERENCE values. */
+enum tomoyo_pref_index {
+	TOMOYO_PREF_MAX_AUDIT_LOG,
+	TOMOYO_PREF_MAX_LEARNING_ENTRY,
+	TOMOYO_MAX_PREF
+};
+
+/********** Structure definitions. **********/
+
+/* Common header for holding ACL entries. */
+struct tomoyo_acl_head {
+	struct list_head list;
+	s8 is_deleted; /* true or false or TOMOYO_GC_IN_PROGRESS */
+} __packed;
+
+/* Common header for shared entries. */
+struct tomoyo_shared_acl_head {
+	struct list_head list;
+	atomic_t users;
+} __packed;
+
+struct tomoyo_policy_namespace;
+
+/* Structure for request info. */
+struct tomoyo_request_info {
+	/*
+	 * For holding parameters specific to operations which deal files.
+	 * NULL if not dealing files.
+	 */
+	struct tomoyo_obj_info *obj;
+	/*
+	 * For holding parameters specific to execve() request.
+	 * NULL if not dealing execve().
+	 */
+	struct tomoyo_execve *ee;
+	struct tomoyo_domain_info *domain;
+	/* For holding parameters. */
+	union {
+		struct {
+			const struct tomoyo_path_info *filename;
+			/* For using wildcards at tomoyo_find_next_domain(). */
+			const struct tomoyo_path_info *matched_path;
+			/* One of values in "enum tomoyo_path_acl_index". */
+			u8 operation;
+		} path;
+		struct {
+			const struct tomoyo_path_info *filename1;
+			const struct tomoyo_path_info *filename2;
+			/* One of values in "enum tomoyo_path2_acl_index". */
+			u8 operation;
+		} path2;
+		struct {
+			const struct tomoyo_path_info *filename;
+			unsigned int mode;
+			unsigned int major;
+			unsigned int minor;
+			/* One of values in "enum tomoyo_mkdev_acl_index". */
+			u8 operation;
+		} mkdev;
+		struct {
+			const struct tomoyo_path_info *filename;
+			unsigned long number;
+			/*
+			 * One of values in
+			 * "enum tomoyo_path_number_acl_index".
+			 */
+			u8 operation;
+		} path_number;
+		struct {
+			const struct tomoyo_path_info *name;
+		} environ;
+		struct {
+			const __be32 *address;
+			u16 port;
+			/* One of values smaller than TOMOYO_SOCK_MAX. */
+			u8 protocol;
+			/* One of values in "enum tomoyo_network_acl_index". */
+			u8 operation;
+			bool is_ipv6;
+		} inet_network;
+		struct {
+			const struct tomoyo_path_info *address;
+			/* One of values smaller than TOMOYO_SOCK_MAX. */
+			u8 protocol;
+			/* One of values in "enum tomoyo_network_acl_index". */
+			u8 operation;
+		} unix_network;
+		struct {
+			const struct tomoyo_path_info *type;
+			const struct tomoyo_path_info *dir;
+			const struct tomoyo_path_info *dev;
+			unsigned long flags;
+			int need_dev;
+		} mount;
+		struct {
+			const struct tomoyo_path_info *domainname;
+		} task;
+	} param;
+	struct tomoyo_acl_info *matched_acl;
+	u8 param_type;
+	bool granted;
+	u8 retry;
+	u8 profile;
+	u8 mode; /* One of tomoyo_mode_index . */
+	u8 type;
+};
+
+/* Structure for holding a token. */
+struct tomoyo_path_info {
+	const char *name;
+	u32 hash;          /* = full_name_hash(name, strlen(name)) */
+	u16 const_len;     /* = tomoyo_const_part_length(name)     */
+	bool is_dir;       /* = tomoyo_strendswith(name, "/")      */
+	bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
+};
+
+/* Structure for holding string data. */
+struct tomoyo_name {
+	struct tomoyo_shared_acl_head head;
+	struct tomoyo_path_info entry;
+};
+
+/* Structure for holding a word. */
+struct tomoyo_name_union {
+	/* Either @filename or @group is NULL. */
+	const struct tomoyo_path_info *filename;
+	struct tomoyo_group *group;
+};
+
+/* Structure for holding a number. */
+struct tomoyo_number_union {
+	unsigned long values[2];
+	struct tomoyo_group *group; /* Maybe NULL. */
+	/* One of values in "enum tomoyo_value_type". */
+	u8 value_type[2];
+};
+
+/* Structure for holding an IP address. */
+struct tomoyo_ipaddr_union {
+	struct in6_addr ip[2]; /* Big endian. */
+	struct tomoyo_group *group; /* Pointer to address group. */
+	bool is_ipv6; /* Valid only if @group == NULL. */
+};
+
+/* Structure for "path_group"/"number_group"/"address_group" directive. */
+struct tomoyo_group {
+	struct tomoyo_shared_acl_head head;
+	const struct tomoyo_path_info *group_name;
+	struct list_head member_list;
+};
+
+/* Structure for "path_group" directive. */
+struct tomoyo_path_group {
+	struct tomoyo_acl_head head;
+	const struct tomoyo_path_info *member_name;
+};
+
+/* Structure for "number_group" directive. */
+struct tomoyo_number_group {
+	struct tomoyo_acl_head head;
+	struct tomoyo_number_union number;
+};
+
+/* Structure for "address_group" directive. */
+struct tomoyo_address_group {
+	struct tomoyo_acl_head head;
+	/* Structure for holding an IP address. */
+	struct tomoyo_ipaddr_union address;
+};
+
+/* Subset of "struct stat". Used by conditional ACL and audit logs. */
+struct tomoyo_mini_stat {
+	kuid_t uid;
+	kgid_t gid;
+	u64 ino;
+	umode_t mode;
+	dev_t dev;
+	dev_t rdev;
+};
+
+/* Structure for dumping argv[] and envp[] of "struct linux_binprm". */
+struct tomoyo_page_dump {
+	struct page *page;    /* Previously dumped page. */
+	char *data;           /* Contents of "page". Size is PAGE_SIZE. */
+};
+
+/* Structure for attribute checks in addition to pathname checks. */
+struct tomoyo_obj_info {
+	/*
+	 * True if tomoyo_get_attributes() was already called, false otherwise.
+	 */
+	bool validate_done;
+	/* True if @stat[] is valid. */
+	bool stat_valid[TOMOYO_MAX_PATH_STAT];
+	/* First pathname. Initialized with { NULL, NULL } if no path. */
+	struct path path1;
+	/* Second pathname. Initialized with { NULL, NULL } if no path. */
+	struct path path2;
+	/*
+	 * Information on @path1, @path1's parent directory, @path2, @path2's
+	 * parent directory.
+	 */
+	struct tomoyo_mini_stat stat[TOMOYO_MAX_PATH_STAT];
+	/*
+	 * Content of symbolic link to be created. NULL for operations other
+	 * than symlink().
+	 */
+	struct tomoyo_path_info *symlink_target;
+};
+
+/* Structure for argv[]. */
+struct tomoyo_argv {
+	unsigned long index;
+	const struct tomoyo_path_info *value;
+	bool is_not;
+};
+
+/* Structure for envp[]. */
+struct tomoyo_envp {
+	const struct tomoyo_path_info *name;
+	const struct tomoyo_path_info *value;
+	bool is_not;
+};
+
+/* Structure for execve() operation. */
+struct tomoyo_execve {
+	struct tomoyo_request_info r;
+	struct tomoyo_obj_info obj;
+	struct linux_binprm *bprm;
+	const struct tomoyo_path_info *transition;
+	/* For dumping argv[] and envp[]. */
+	struct tomoyo_page_dump dump;
+	/* For temporary use. */
+	char *tmp; /* Size is TOMOYO_EXEC_TMPSIZE bytes */
+};
+
+/* Structure for entries which follows "struct tomoyo_condition". */
+struct tomoyo_condition_element {
+	/*
+	 * Left hand operand. A "struct tomoyo_argv" for TOMOYO_ARGV_ENTRY, a
+	 * "struct tomoyo_envp" for TOMOYO_ENVP_ENTRY is attached to the tail
+	 * of the array of this struct.
+	 */
+	u8 left;
+	/*
+	 * Right hand operand. A "struct tomoyo_number_union" for
+	 * TOMOYO_NUMBER_UNION, a "struct tomoyo_name_union" for
+	 * TOMOYO_NAME_UNION is attached to the tail of the array of this
+	 * struct.
+	 */
+	u8 right;
+	/* Equation operator. True if equals or overlaps, false otherwise. */
+	bool equals;
+};
+
+/* Structure for optional arguments. */
+struct tomoyo_condition {
+	struct tomoyo_shared_acl_head head;
+	u32 size; /* Memory size allocated for this entry. */
+	u16 condc; /* Number of conditions in this struct. */
+	u16 numbers_count; /* Number of "struct tomoyo_number_union values". */
+	u16 names_count; /* Number of "struct tomoyo_name_union names". */
+	u16 argc; /* Number of "struct tomoyo_argv". */
+	u16 envc; /* Number of "struct tomoyo_envp". */
+	u8 grant_log; /* One of values in "enum tomoyo_grant_log". */
+	const struct tomoyo_path_info *transit; /* Maybe NULL. */
+	/*
+	 * struct tomoyo_condition_element condition[condc];
+	 * struct tomoyo_number_union values[numbers_count];
+	 * struct tomoyo_name_union names[names_count];
+	 * struct tomoyo_argv argv[argc];
+	 * struct tomoyo_envp envp[envc];
+	 */
+};
+
+/* Common header for individual entries. */
+struct tomoyo_acl_info {
+	struct list_head list;
+	struct tomoyo_condition *cond; /* Maybe NULL. */
+	s8 is_deleted; /* true or false or TOMOYO_GC_IN_PROGRESS */
+	u8 type; /* One of values in "enum tomoyo_acl_entry_type_index". */
+} __packed;
+
+/* Structure for domain information. */
+struct tomoyo_domain_info {
+	struct list_head list;
+	struct list_head acl_info_list;
+	/* Name of this domain. Never NULL.          */
+	const struct tomoyo_path_info *domainname;
+	/* Namespace for this domain. Never NULL. */
+	struct tomoyo_policy_namespace *ns;
+	/* Group numbers to use.   */
+	unsigned long group[TOMOYO_MAX_ACL_GROUPS / BITS_PER_LONG];
+	u8 profile;        /* Profile number to use. */
+	bool is_deleted;   /* Delete flag.           */
+	bool flags[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
+	atomic_t users; /* Number of referring tasks. */
+};
+
+/*
+ * Structure for "task manual_domain_transition" directive.
+ */
+struct tomoyo_task_acl {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MANUAL_TASK_ACL */
+	/* Pointer to domainname. */
+	const struct tomoyo_path_info *domainname;
+};
+
+/*
+ * Structure for "file execute", "file read", "file write", "file append",
+ * "file unlink", "file getattr", "file rmdir", "file truncate",
+ * "file symlink", "file chroot" and "file unmount" directive.
+ */
+struct tomoyo_path_acl {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_ACL */
+	u16 perm; /* Bitmask of values in "enum tomoyo_path_acl_index". */
+	struct tomoyo_name_union name;
+};
+
+/*
+ * Structure for "file create", "file mkdir", "file mkfifo", "file mksock",
+ * "file ioctl", "file chmod", "file chown" and "file chgrp" directive.
+ */
+struct tomoyo_path_number_acl {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_NUMBER_ACL */
+	/* Bitmask of values in "enum tomoyo_path_number_acl_index". */
+	u8 perm;
+	struct tomoyo_name_union name;
+	struct tomoyo_number_union number;
+};
+
+/* Structure for "file mkblock" and "file mkchar" directive. */
+struct tomoyo_mkdev_acl {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MKDEV_ACL */
+	u8 perm; /* Bitmask of values in "enum tomoyo_mkdev_acl_index". */
+	struct tomoyo_name_union name;
+	struct tomoyo_number_union mode;
+	struct tomoyo_number_union major;
+	struct tomoyo_number_union minor;
+};
+
+/*
+ * Structure for "file rename", "file link" and "file pivot_root" directive.
+ */
+struct tomoyo_path2_acl {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH2_ACL */
+	u8 perm; /* Bitmask of values in "enum tomoyo_path2_acl_index". */
+	struct tomoyo_name_union name1;
+	struct tomoyo_name_union name2;
+};
+
+/* Structure for "file mount" directive. */
+struct tomoyo_mount_acl {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MOUNT_ACL */
+	struct tomoyo_name_union dev_name;
+	struct tomoyo_name_union dir_name;
+	struct tomoyo_name_union fs_type;
+	struct tomoyo_number_union flags;
+};
+
+/* Structure for "misc env" directive in domain policy. */
+struct tomoyo_env_acl {
+	struct tomoyo_acl_info head;        /* type = TOMOYO_TYPE_ENV_ACL  */
+	const struct tomoyo_path_info *env; /* environment variable */
+};
+
+/* Structure for "network inet" directive. */
+struct tomoyo_inet_acl {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_INET_ACL */
+	u8 protocol;
+	u8 perm; /* Bitmask of values in "enum tomoyo_network_acl_index" */
+	struct tomoyo_ipaddr_union address;
+	struct tomoyo_number_union port;
+};
+
+/* Structure for "network unix" directive. */
+struct tomoyo_unix_acl {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_UNIX_ACL */
+	u8 protocol;
+	u8 perm; /* Bitmask of values in "enum tomoyo_network_acl_index" */
+	struct tomoyo_name_union name;
+};
+
+/* Structure for holding a line from /sys/kernel/security/tomoyo/ interface. */
+struct tomoyo_acl_param {
+	char *data;
+	struct list_head *list;
+	struct tomoyo_policy_namespace *ns;
+	bool is_delete;
+};
+
+#define TOMOYO_MAX_IO_READ_QUEUE 64
+
+/*
+ * Structure for reading/writing policy via /sys/kernel/security/tomoyo
+ * interfaces.
+ */
+struct tomoyo_io_buffer {
+	void (*read)(struct tomoyo_io_buffer *head);
+	int (*write)(struct tomoyo_io_buffer *head);
+	__poll_t (*poll)(struct file *file, poll_table *wait);
+	/* Exclusive lock for this structure.   */
+	struct mutex io_sem;
+	char __user *read_user_buf;
+	size_t read_user_buf_avail;
+	struct {
+		struct list_head *ns;
+		struct list_head *domain;
+		struct list_head *group;
+		struct list_head *acl;
+		size_t avail;
+		unsigned int step;
+		unsigned int query_index;
+		u16 index;
+		u16 cond_index;
+		u8 acl_group_index;
+		u8 cond_step;
+		u8 bit;
+		u8 w_pos;
+		bool eof;
+		bool print_this_domain_only;
+		bool print_transition_related_only;
+		bool print_cond_part;
+		const char *w[TOMOYO_MAX_IO_READ_QUEUE];
+	} r;
+	struct {
+		struct tomoyo_policy_namespace *ns;
+		/* The position currently writing to.   */
+		struct tomoyo_domain_info *domain;
+		/* Bytes available for writing.         */
+		size_t avail;
+		bool is_delete;
+	} w;
+	/* Buffer for reading.                  */
+	char *read_buf		__guarded_by(&io_sem);
+	/* Size of read buffer.                 */
+	size_t readbuf_size	__guarded_by(&io_sem);
+	/* Buffer for writing.                  */
+	char *write_buf		__guarded_by(&io_sem);
+	/* Size of write buffer.                */
+	size_t writebuf_size	__guarded_by(&io_sem);
+	/* Type of this interface.              */
+	enum tomoyo_securityfs_interface_index type;
+	/* Users counter protected by tomoyo_io_buffer_list_lock. */
+	u8 users;
+	/* List for telling GC not to kfree() elements. */
+	struct list_head list;
+};
+
+/*
+ * Structure for "initialize_domain"/"no_initialize_domain"/"keep_domain"/
+ * "no_keep_domain" keyword.
+ */
+struct tomoyo_transition_control {
+	struct tomoyo_acl_head head;
+	u8 type; /* One of values in "enum tomoyo_transition_type".  */
+	/* True if the domainname is tomoyo_get_last_name(). */
+	bool is_last_name;
+	const struct tomoyo_path_info *domainname; /* Maybe NULL */
+	const struct tomoyo_path_info *program;    /* Maybe NULL */
+};
+
+/* Structure for "aggregator" keyword. */
+struct tomoyo_aggregator {
+	struct tomoyo_acl_head head;
+	const struct tomoyo_path_info *original_name;
+	const struct tomoyo_path_info *aggregated_name;
+};
+
+/* Structure for policy manager. */
+struct tomoyo_manager {
+	struct tomoyo_acl_head head;
+	/* A path to program or a domainname. */
+	const struct tomoyo_path_info *manager;
+};
+
+struct tomoyo_preference {
+	unsigned int learning_max_entry;
+	bool enforcing_verbose;
+	bool learning_verbose;
+	bool permissive_verbose;
+};
+
+/* Structure for /sys/kernel/security/tomnoyo/profile interface. */
+struct tomoyo_profile {
+	const struct tomoyo_path_info *comment;
+	struct tomoyo_preference *learning;
+	struct tomoyo_preference *permissive;
+	struct tomoyo_preference *enforcing;
+	struct tomoyo_preference preference;
+	u8 default_config;
+	u8 config[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX];
+	unsigned int pref[TOMOYO_MAX_PREF];
+};
+
+/* Structure for representing YYYY/MM/DD hh/mm/ss. */
+struct tomoyo_time {
+	u16 year;
+	u8 month;
+	u8 day;
+	u8 hour;
+	u8 min;
+	u8 sec;
+};
+
+/* Structure for policy namespace. */
+struct tomoyo_policy_namespace {
+	/* Profile table. Memory is allocated as needed. */
+	struct tomoyo_profile *profile_ptr[TOMOYO_MAX_PROFILES];
+	/* List of "struct tomoyo_group". */
+	struct list_head group_list[TOMOYO_MAX_GROUP];
+	/* List of policy. */
+	struct list_head policy_list[TOMOYO_MAX_POLICY];
+	/* The global ACL referred by "use_group" keyword. */
+	struct list_head acl_group[TOMOYO_MAX_ACL_GROUPS];
+	/* List for connecting to tomoyo_namespace_list list. */
+	struct list_head namespace_list;
+	/* Profile version. Currently only 20150505 is defined. */
+	unsigned int profile_version;
+	/* Name of this namespace (e.g. "<kernel>", "</usr/sbin/httpd>" ). */
+	const char *name;
+};
+
+/* Structure for "struct task_struct"->security. */
+struct tomoyo_task {
+	struct tomoyo_domain_info *domain_info;
+	struct tomoyo_domain_info *old_domain_info;
+};
+
+/********** External variable definitions. **********/
+
+extern bool tomoyo_policy_loaded;
+extern int tomoyo_enabled;
+extern const char * const tomoyo_condition_keyword
+[TOMOYO_MAX_CONDITION_KEYWORD];
+extern const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
+extern const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
+					      + TOMOYO_MAX_MAC_CATEGORY_INDEX];
+extern const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE];
+extern const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION];
+extern const char * const tomoyo_proto_keyword[TOMOYO_SOCK_MAX];
+extern const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION];
+extern const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX];
+extern const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION];
+extern const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION];
+extern const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION];
+extern struct list_head tomoyo_condition_list;
+extern struct list_head tomoyo_domain_list;
+extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
+extern struct list_head tomoyo_namespace_list;
+extern struct mutex tomoyo_policy_lock;
+extern struct srcu_struct tomoyo_ss;
+extern struct tomoyo_domain_info tomoyo_kernel_domain;
+extern struct tomoyo_policy_namespace tomoyo_kernel_namespace;
+extern unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT];
+extern unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];
+extern struct lsm_blob_sizes tomoyo_blob_sizes;
+
+/********** Function prototypes. **********/
+
+int tomoyo_interface_init(void);
+
+bool tomoyo_address_matches_group(const bool is_ipv6, const __be32 *address,
+				  const struct tomoyo_group *group);
+bool tomoyo_compare_number_union(const unsigned long value,
+				 const struct tomoyo_number_union *ptr);
+bool tomoyo_condition(struct tomoyo_request_info *r,
+		      const struct tomoyo_condition *cond);
+bool tomoyo_correct_domain(const unsigned char *domainname);
+bool tomoyo_correct_path(const char *filename);
+bool tomoyo_correct_word(const char *string);
+bool tomoyo_domain_def(const unsigned char *buffer);
+bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r);
+bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
+		      struct tomoyo_page_dump *dump);
+bool tomoyo_memory_ok(void *ptr);
+bool tomoyo_number_matches_group(const unsigned long min,
+				 const unsigned long max,
+				 const struct tomoyo_group *group);
+bool tomoyo_parse_ipaddr_union(struct tomoyo_acl_param *param,
+			       struct tomoyo_ipaddr_union *ptr);
+bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
+			     struct tomoyo_name_union *ptr);
+bool tomoyo_parse_number_union(struct tomoyo_acl_param *param,
+			       struct tomoyo_number_union *ptr);
+bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
+				 const struct tomoyo_path_info *pattern);
+bool tomoyo_permstr(const char *string, const char *keyword);
+bool tomoyo_str_starts(char **src, const char *find);
+char *tomoyo_encode(const char *str);
+char *tomoyo_encode2(const char *str, int str_len);
+char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
+		      va_list args) __printf(3, 0);
+char *tomoyo_read_token(struct tomoyo_acl_param *param);
+char *tomoyo_realpath_from_path(const struct path *path);
+char *tomoyo_realpath_nofollow(const char *pathname);
+const char *tomoyo_get_exe(void);
+const struct tomoyo_path_info *tomoyo_compare_name_union
+(const struct tomoyo_path_info *name, const struct tomoyo_name_union *ptr);
+const struct tomoyo_path_info *tomoyo_get_domainname
+(struct tomoyo_acl_param *param);
+const struct tomoyo_path_info *tomoyo_get_name(const char *name);
+const struct tomoyo_path_info *tomoyo_path_matches_group
+(const struct tomoyo_path_info *pathname, const struct tomoyo_group *group);
+int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
+				 const struct path *path, const int flag);
+void tomoyo_close_control(struct tomoyo_io_buffer *head);
+int tomoyo_env_perm(struct tomoyo_request_info *r, const char *env) __must_hold_shared(&tomoyo_ss);
+int tomoyo_execute_permission(struct tomoyo_request_info *r,
+			      const struct tomoyo_path_info *filename) __must_hold_shared(&tomoyo_ss);
+int tomoyo_find_next_domain(struct linux_binprm *bprm) __must_hold_shared(&tomoyo_ss);
+int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
+		    const u8 index);
+int tomoyo_init_request_info(struct tomoyo_request_info *r,
+			     struct tomoyo_domain_info *domain,
+			     const u8 index);
+int tomoyo_mkdev_perm(const u8 operation, const struct path *path,
+		      const unsigned int mode, unsigned int dev);
+int tomoyo_mount_permission(const char *dev_name, const struct path *path,
+			    const char *type, unsigned long flags,
+			    void *data_page);
+int tomoyo_open_control(const u8 type, struct file *file);
+int tomoyo_path2_perm(const u8 operation, const struct path *path1,
+		      const struct path *path2);
+int tomoyo_path_number_perm(const u8 operation, const struct path *path,
+			    unsigned long number);
+int tomoyo_path_perm(const u8 operation, const struct path *path,
+		     const char *target);
+__poll_t tomoyo_poll_control(struct file *file, poll_table *wait);
+__poll_t tomoyo_poll_log(struct file *file, poll_table *wait);
+int tomoyo_socket_bind_permission(struct socket *sock, struct sockaddr *addr,
+				  int addr_len);
+int tomoyo_socket_connect_permission(struct socket *sock,
+				     struct sockaddr *addr, int addr_len);
+int tomoyo_socket_listen_permission(struct socket *sock);
+int tomoyo_socket_sendmsg_permission(struct socket *sock, struct msghdr *msg,
+				     int size);
+int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
+	__must_hold_shared(&tomoyo_ss)
+	__printf(2, 3);
+int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
+			 struct tomoyo_acl_param *param,
+			 bool (*check_duplicate)
+			 (const struct tomoyo_acl_info *,
+			  const struct tomoyo_acl_info *),
+			 bool (*merge_duplicate)
+			 (struct tomoyo_acl_info *, struct tomoyo_acl_info *,
+			  const bool));
+int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
+			 struct tomoyo_acl_param *param,
+			 bool (*check_duplicate)
+			 (const struct tomoyo_acl_head *,
+			  const struct tomoyo_acl_head *));
+int tomoyo_write_aggregator(struct tomoyo_acl_param *param);
+int tomoyo_write_file(struct tomoyo_acl_param *param);
+int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type);
+int tomoyo_write_misc(struct tomoyo_acl_param *param);
+int tomoyo_write_inet_network(struct tomoyo_acl_param *param);
+int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
+				    const u8 type);
+int tomoyo_write_unix_network(struct tomoyo_acl_param *param);
+ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
+			    const int buffer_len);
+ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
+			     const char __user *buffer, const int buffer_len);
+struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param);
+struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
+						const bool transit);
+struct tomoyo_domain_info *tomoyo_domain(void);
+struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
+struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param,
+				      const u8 idx);
+struct tomoyo_policy_namespace *tomoyo_assign_namespace
+(const char *domainname);
+struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
+				      const u8 profile);
+u8 tomoyo_parse_ulong(unsigned long *result, char **str);
+void *tomoyo_commit_ok(void *data, const unsigned int size);
+void __init tomoyo_load_builtin_policy(void);
+void __init tomoyo_mm_init(void);
+void tomoyo_check_acl(struct tomoyo_request_info *r,
+		      bool (*check_entry)(struct tomoyo_request_info *,
+					  const struct tomoyo_acl_info *));
+void tomoyo_check_profile(void);
+void tomoyo_convert_time(time64_t time, struct tomoyo_time *stamp);
+void tomoyo_del_condition(struct list_head *element);
+void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
+void tomoyo_get_attributes(struct tomoyo_obj_info *obj);
+void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns);
+void tomoyo_load_policy(const char *filename);
+void tomoyo_normalize_line(unsigned char *buffer);
+void tomoyo_notify_gc(struct tomoyo_io_buffer *head, const bool is_register);
+void tomoyo_print_ip(char *buf, const unsigned int size,
+		     const struct tomoyo_ipaddr_union *ptr);
+void tomoyo_print_ulong(char *buffer, const int buffer_len,
+			const unsigned long value, const u8 type);
+void tomoyo_put_name_union(struct tomoyo_name_union *ptr);
+void tomoyo_put_number_union(struct tomoyo_number_union *ptr);
+void tomoyo_read_log(struct tomoyo_io_buffer *head) __must_hold(&head->io_sem);
+void tomoyo_update_stat(const u8 index);
+void tomoyo_warn_oom(const char *function);
+void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...)
+	__printf(2, 3);
+void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
+		       va_list args) __printf(3, 0);
+
+/********** Inlined functions. **********/
+
+/**
+ * tomoyo_read_lock - Take lock for protecting policy.
+ *
+ * Returns index number for tomoyo_read_unlock().
+ */
+static inline int tomoyo_read_lock(void)
+	__acquires_shared(&tomoyo_ss)
+{
+	return srcu_read_lock(&tomoyo_ss);
+}
+
+/**
+ * tomoyo_read_unlock - Release lock for protecting policy.
+ *
+ * @idx: Index number returned by tomoyo_read_lock().
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_read_unlock(int idx)
+	__releases_shared(&tomoyo_ss)
+{
+	srcu_read_unlock(&tomoyo_ss, idx);
+}
+
+/**
+ * tomoyo_sys_getppid - Copy of getppid().
+ *
+ * Returns parent process's PID.
+ *
+ * Alpha does not have getppid() defined. To be able to build this module on
+ * Alpha, I have to copy getppid() from kernel/timer.c.
+ */
+static inline pid_t tomoyo_sys_getppid(void)
+{
+	pid_t pid;
+
+	rcu_read_lock();
+	pid = task_tgid_vnr(rcu_dereference(current->real_parent));
+	rcu_read_unlock();
+	return pid;
+}
+
+/**
+ * tomoyo_sys_getpid - Copy of getpid().
+ *
+ * Returns current thread's PID.
+ *
+ * Alpha does not have getpid() defined. To be able to build this module on
+ * Alpha, I have to copy getpid() from kernel/timer.c.
+ */
+static inline pid_t tomoyo_sys_getpid(void)
+{
+	return task_tgid_vnr(current);
+}
+
+/**
+ * tomoyo_pathcmp - strcmp() for "struct tomoyo_path_info" structure.
+ *
+ * @a: Pointer to "struct tomoyo_path_info".
+ * @b: Pointer to "struct tomoyo_path_info".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
+				  const struct tomoyo_path_info *b)
+{
+	return a->hash != b->hash || strcmp(a->name, b->name);
+}
+
+/**
+ * tomoyo_put_name - Drop reference on "struct tomoyo_name".
+ *
+ * @name: Pointer to "struct tomoyo_path_info". Maybe NULL.
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_put_name(const struct tomoyo_path_info *name)
+{
+	if (name) {
+		struct tomoyo_name *ptr =
+			container_of(name, typeof(*ptr), entry);
+		atomic_dec(&ptr->head.users);
+	}
+}
+
+/**
+ * tomoyo_put_condition - Drop reference on "struct tomoyo_condition".
+ *
+ * @cond: Pointer to "struct tomoyo_condition". Maybe NULL.
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_put_condition(struct tomoyo_condition *cond)
+{
+	if (cond)
+		atomic_dec(&cond->head.users);
+}
+
+/**
+ * tomoyo_put_group - Drop reference on "struct tomoyo_group".
+ *
+ * @group: Pointer to "struct tomoyo_group". Maybe NULL.
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_put_group(struct tomoyo_group *group)
+{
+	if (group)
+		atomic_dec(&group->head.users);
+}
+
+/**
+ * tomoyo_task - Get "struct tomoyo_task" for specified thread.
+ *
+ * @task - Pointer to "struct task_struct".
+ *
+ * Returns pointer to "struct tomoyo_task" for specified thread.
+ */
+static inline struct tomoyo_task *tomoyo_task(struct task_struct *task)
+{
+	return task->security + tomoyo_blob_sizes.lbs_task;
+}
+
+/**
+ * tomoyo_same_name_union - Check for duplicated "struct tomoyo_name_union" entry.
+ *
+ * @a: Pointer to "struct tomoyo_name_union".
+ * @b: Pointer to "struct tomoyo_name_union".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static inline bool tomoyo_same_name_union
+(const struct tomoyo_name_union *a, const struct tomoyo_name_union *b)
+{
+	return a->filename == b->filename && a->group == b->group;
+}
+
+/**
+ * tomoyo_same_number_union - Check for duplicated "struct tomoyo_number_union" entry.
+ *
+ * @a: Pointer to "struct tomoyo_number_union".
+ * @b: Pointer to "struct tomoyo_number_union".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static inline bool tomoyo_same_number_union
+(const struct tomoyo_number_union *a, const struct tomoyo_number_union *b)
+{
+	return a->values[0] == b->values[0] && a->values[1] == b->values[1] &&
+		a->group == b->group && a->value_type[0] == b->value_type[0] &&
+		a->value_type[1] == b->value_type[1];
+}
+
+/**
+ * tomoyo_same_ipaddr_union - Check for duplicated "struct tomoyo_ipaddr_union" entry.
+ *
+ * @a: Pointer to "struct tomoyo_ipaddr_union".
+ * @b: Pointer to "struct tomoyo_ipaddr_union".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static inline bool tomoyo_same_ipaddr_union
+(const struct tomoyo_ipaddr_union *a, const struct tomoyo_ipaddr_union *b)
+{
+	return !memcmp(a->ip, b->ip, sizeof(a->ip)) && a->group == b->group &&
+		a->is_ipv6 == b->is_ipv6;
+}
+
+/**
+ * tomoyo_current_namespace - Get "struct tomoyo_policy_namespace" for current thread.
+ *
+ * Returns pointer to "struct tomoyo_policy_namespace" for current thread.
+ */
+static inline struct tomoyo_policy_namespace *tomoyo_current_namespace(void)
+{
+	return tomoyo_domain()->ns;
+}
+
+/**
+ * list_for_each_cookie - iterate over a list with cookie.
+ * @pos:        the &struct list_head to use as a loop cursor.
+ * @head:       the head for your list.
+ */
+#define list_for_each_cookie(pos, head)					\
+	if (!pos)							\
+		pos =  srcu_dereference((head)->next, &tomoyo_ss);	\
+	for ( ; pos != (head); pos = srcu_dereference(pos->next, &tomoyo_ss))
+
+#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */
diff --git a/security/tomoyo/condition.c b/security/tomoyo/condition.c
new file mode 100644
index 000000000..8b107b1ff
--- /dev/null
+++ b/security/tomoyo/condition.c
@@ -0,0 +1,1122 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/condition.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include "common.h"
+#include <linux/slab.h>
+
+/* List of "struct tomoyo_condition". */
+LIST_HEAD(tomoyo_condition_list);
+
+/**
+ * tomoyo_argv - Check argv[] in "struct linux_binbrm".
+ *
+ * @index:   Index number of @arg_ptr.
+ * @arg_ptr: Contents of argv[@index].
+ * @argc:    Length of @argv.
+ * @argv:    Pointer to "struct tomoyo_argv".
+ * @checked: Set to true if @argv[@index] was found.
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_argv(const unsigned int index, const char *arg_ptr,
+			const int argc, const struct tomoyo_argv *argv,
+			u8 *checked)
+{
+	int i;
+	struct tomoyo_path_info arg;
+
+	arg.name = arg_ptr;
+	for (i = 0; i < argc; argv++, checked++, i++) {
+		bool result;
+
+		if (index != argv->index)
+			continue;
+		*checked = 1;
+		tomoyo_fill_path_info(&arg);
+		result = tomoyo_path_matches_pattern(&arg, argv->value);
+		if (argv->is_not)
+			result = !result;
+		if (!result)
+			return false;
+	}
+	return true;
+}
+
+/**
+ * tomoyo_envp - Check envp[] in "struct linux_binbrm".
+ *
+ * @env_name:  The name of environment variable.
+ * @env_value: The value of environment variable.
+ * @envc:      Length of @envp.
+ * @envp:      Pointer to "struct tomoyo_envp".
+ * @checked:   Set to true if @envp[@env_name] was found.
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_envp(const char *env_name, const char *env_value,
+			const int envc, const struct tomoyo_envp *envp,
+			u8 *checked)
+{
+	int i;
+	struct tomoyo_path_info name;
+	struct tomoyo_path_info value;
+
+	name.name = env_name;
+	tomoyo_fill_path_info(&name);
+	value.name = env_value;
+	tomoyo_fill_path_info(&value);
+	for (i = 0; i < envc; envp++, checked++, i++) {
+		bool result;
+
+		if (!tomoyo_path_matches_pattern(&name, envp->name))
+			continue;
+		*checked = 1;
+		if (envp->value) {
+			result = tomoyo_path_matches_pattern(&value,
+							     envp->value);
+			if (envp->is_not)
+				result = !result;
+		} else {
+			result = true;
+			if (!envp->is_not)
+				result = !result;
+		}
+		if (!result)
+			return false;
+	}
+	return true;
+}
+
+/**
+ * tomoyo_scan_bprm - Scan "struct linux_binprm".
+ *
+ * @ee:   Pointer to "struct tomoyo_execve".
+ * @argc: Length of @argc.
+ * @argv: Pointer to "struct tomoyo_argv".
+ * @envc: Length of @envp.
+ * @envp: Pointer to "struct tomoyo_envp".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_scan_bprm(struct tomoyo_execve *ee,
+			     const u16 argc, const struct tomoyo_argv *argv,
+			     const u16 envc, const struct tomoyo_envp *envp)
+{
+	struct linux_binprm *bprm = ee->bprm;
+	struct tomoyo_page_dump *dump = &ee->dump;
+	char *arg_ptr = ee->tmp;
+	int arg_len = 0;
+	unsigned long pos = bprm->p;
+	int offset = pos % PAGE_SIZE;
+	int argv_count = bprm->argc;
+	int envp_count = bprm->envc;
+	bool result = true;
+	u8 local_checked[32];
+	u8 *checked;
+
+	if (argc + envc <= sizeof(local_checked)) {
+		checked = local_checked;
+		memset(local_checked, 0, sizeof(local_checked));
+	} else {
+		checked = kzalloc(argc + envc, GFP_NOFS);
+		if (!checked)
+			return false;
+	}
+	while (argv_count || envp_count) {
+		if (!tomoyo_dump_page(bprm, pos, dump)) {
+			result = false;
+			goto out;
+		}
+		pos += PAGE_SIZE - offset;
+		while (offset < PAGE_SIZE) {
+			/* Read. */
+			const char *kaddr = dump->data;
+			const unsigned char c = kaddr[offset++];
+
+			if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
+				if (c == '\\') {
+					arg_ptr[arg_len++] = '\\';
+					arg_ptr[arg_len++] = '\\';
+				} else if (c > ' ' && c < 127) {
+					arg_ptr[arg_len++] = c;
+				} else {
+					arg_ptr[arg_len++] = '\\';
+					arg_ptr[arg_len++] = (c >> 6) + '0';
+					arg_ptr[arg_len++] =
+						((c >> 3) & 7) + '0';
+					arg_ptr[arg_len++] = (c & 7) + '0';
+				}
+			} else {
+				arg_ptr[arg_len] = '\0';
+			}
+			if (c)
+				continue;
+			/* Check. */
+			if (argv_count) {
+				if (!tomoyo_argv(bprm->argc - argv_count,
+						 arg_ptr, argc, argv,
+						 checked)) {
+					result = false;
+					break;
+				}
+				argv_count--;
+			} else if (envp_count) {
+				char *cp = strchr(arg_ptr, '=');
+
+				if (cp) {
+					*cp = '\0';
+					if (!tomoyo_envp(arg_ptr, cp + 1,
+							 envc, envp,
+							 checked + argc)) {
+						result = false;
+						break;
+					}
+				}
+				envp_count--;
+			} else {
+				break;
+			}
+			arg_len = 0;
+		}
+		offset = 0;
+		if (!result)
+			break;
+	}
+out:
+	if (result) {
+		int i;
+
+		/* Check not-yet-checked entries. */
+		for (i = 0; i < argc; i++) {
+			if (checked[i])
+				continue;
+			/*
+			 * Return true only if all unchecked indexes in
+			 * bprm->argv[] are not matched.
+			 */
+			if (argv[i].is_not)
+				continue;
+			result = false;
+			break;
+		}
+		for (i = 0; i < envc; envp++, i++) {
+			if (checked[argc + i])
+				continue;
+			/*
+			 * Return true only if all unchecked environ variables
+			 * in bprm->envp[] are either undefined or not matched.
+			 */
+			if ((!envp->value && !envp->is_not) ||
+			    (envp->value && envp->is_not))
+				continue;
+			result = false;
+			break;
+		}
+	}
+	if (checked != local_checked)
+		kfree(checked);
+	return result;
+}
+
+/**
+ * tomoyo_scan_exec_realpath - Check "exec.realpath" parameter of "struct tomoyo_condition".
+ *
+ * @file:  Pointer to "struct file".
+ * @ptr:   Pointer to "struct tomoyo_name_union".
+ * @match: True if "exec.realpath=", false if "exec.realpath!=".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_scan_exec_realpath(struct file *file,
+				      const struct tomoyo_name_union *ptr,
+				      const bool match)
+{
+	bool result;
+	struct tomoyo_path_info exe;
+
+	if (!file)
+		return false;
+	exe.name = tomoyo_realpath_from_path(&file->f_path);
+	if (!exe.name)
+		return false;
+	tomoyo_fill_path_info(&exe);
+	result = tomoyo_compare_name_union(&exe, ptr);
+	kfree(exe.name);
+	return result == match;
+}
+
+/**
+ * tomoyo_get_dqword - tomoyo_get_name() for a quoted string.
+ *
+ * @start: String to save.
+ *
+ * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
+ */
+static const struct tomoyo_path_info *tomoyo_get_dqword(char *start)
+{
+	char *cp = start + strlen(start) - 1;
+
+	if (cp == start || *start++ != '"' || *cp != '"')
+		return NULL;
+	*cp = '\0';
+	if (*start && !tomoyo_correct_word(start))
+		return NULL;
+	return tomoyo_get_name(start);
+}
+
+/**
+ * tomoyo_parse_name_union_quoted - Parse a quoted word.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ * @ptr:   Pointer to "struct tomoyo_name_union".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_parse_name_union_quoted(struct tomoyo_acl_param *param,
+					   struct tomoyo_name_union *ptr)
+{
+	char *filename = param->data;
+
+	if (*filename == '@')
+		return tomoyo_parse_name_union(param, ptr);
+	ptr->filename = tomoyo_get_dqword(filename);
+	return ptr->filename != NULL;
+}
+
+/**
+ * tomoyo_parse_argv - Parse an argv[] condition part.
+ *
+ * @left:  Lefthand value.
+ * @right: Righthand value.
+ * @argv:  Pointer to "struct tomoyo_argv".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_parse_argv(char *left, char *right,
+			      struct tomoyo_argv *argv)
+{
+	if (tomoyo_parse_ulong(&argv->index, &left) !=
+	    TOMOYO_VALUE_TYPE_DECIMAL || *left++ != ']' || *left)
+		return false;
+	argv->value = tomoyo_get_dqword(right);
+	return argv->value != NULL;
+}
+
+/**
+ * tomoyo_parse_envp - Parse an envp[] condition part.
+ *
+ * @left:  Lefthand value.
+ * @right: Righthand value.
+ * @envp:  Pointer to "struct tomoyo_envp".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_parse_envp(char *left, char *right,
+			      struct tomoyo_envp *envp)
+{
+	const struct tomoyo_path_info *name;
+	const struct tomoyo_path_info *value;
+	char *cp = left + strlen(left) - 1;
+
+	if (*cp-- != ']' || *cp != '"')
+		goto out;
+	*cp = '\0';
+	if (!tomoyo_correct_word(left))
+		goto out;
+	name = tomoyo_get_name(left);
+	if (!name)
+		goto out;
+	if (!strcmp(right, "NULL")) {
+		value = NULL;
+	} else {
+		value = tomoyo_get_dqword(right);
+		if (!value) {
+			tomoyo_put_name(name);
+			goto out;
+		}
+	}
+	envp->name = name;
+	envp->value = value;
+	return true;
+out:
+	return false;
+}
+
+/**
+ * tomoyo_same_condition - Check for duplicated "struct tomoyo_condition" entry.
+ *
+ * @a: Pointer to "struct tomoyo_condition".
+ * @b: Pointer to "struct tomoyo_condition".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static inline bool tomoyo_same_condition(const struct tomoyo_condition *a,
+					 const struct tomoyo_condition *b)
+{
+	return a->size == b->size && a->condc == b->condc &&
+		a->numbers_count == b->numbers_count &&
+		a->names_count == b->names_count &&
+		a->argc == b->argc && a->envc == b->envc &&
+		a->grant_log == b->grant_log && a->transit == b->transit &&
+		!memcmp(a + 1, b + 1, a->size - sizeof(*a));
+}
+
+/**
+ * tomoyo_condition_type - Get condition type.
+ *
+ * @word: Keyword string.
+ *
+ * Returns one of values in "enum tomoyo_conditions_index" on success,
+ * TOMOYO_MAX_CONDITION_KEYWORD otherwise.
+ */
+static u8 tomoyo_condition_type(const char *word)
+{
+	u8 i;
+
+	for (i = 0; i < TOMOYO_MAX_CONDITION_KEYWORD; i++) {
+		if (!strcmp(word, tomoyo_condition_keyword[i]))
+			break;
+	}
+	return i;
+}
+
+/* Define this to enable debug mode. */
+/* #define DEBUG_CONDITION */
+
+#ifdef DEBUG_CONDITION
+#define dprintk printk
+#else
+#define dprintk(...) do { } while (0)
+#endif
+
+/**
+ * tomoyo_commit_condition - Commit "struct tomoyo_condition".
+ *
+ * @entry: Pointer to "struct tomoyo_condition".
+ *
+ * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
+ *
+ * This function merges duplicated entries. This function returns NULL if
+ * @entry is not duplicated but memory quota for policy has exceeded.
+ */
+static struct tomoyo_condition *tomoyo_commit_condition
+(struct tomoyo_condition *entry)
+{
+	struct tomoyo_condition *ptr;
+	bool found = false;
+
+	if (mutex_lock_interruptible(&tomoyo_policy_lock)) {
+		dprintk(KERN_WARNING "%u: %s failed\n", __LINE__, __func__);
+		ptr = NULL;
+		found = true;
+		goto out;
+	}
+	list_for_each_entry(ptr, &tomoyo_condition_list, head.list) {
+		if (!tomoyo_same_condition(ptr, entry) ||
+		    atomic_read(&ptr->head.users) == TOMOYO_GC_IN_PROGRESS)
+			continue;
+		/* Same entry found. Share this entry. */
+		atomic_inc(&ptr->head.users);
+		found = true;
+		break;
+	}
+	if (!found) {
+		if (tomoyo_memory_ok(entry)) {
+			atomic_set(&entry->head.users, 1);
+			list_add(&entry->head.list, &tomoyo_condition_list);
+		} else {
+			found = true;
+			ptr = NULL;
+		}
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+out:
+	if (found) {
+		tomoyo_del_condition(&entry->head.list);
+		kfree(entry);
+		entry = ptr;
+	}
+	return entry;
+}
+
+/**
+ * tomoyo_get_transit_preference - Parse domain transition preference for execve().
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ * @e:     Pointer to "struct tomoyo_condition".
+ *
+ * Returns the condition string part.
+ */
+static char *tomoyo_get_transit_preference(struct tomoyo_acl_param *param,
+					   struct tomoyo_condition *e)
+{
+	char * const pos = param->data;
+	bool flag;
+
+	if (*pos == '<') {
+		e->transit = tomoyo_get_domainname(param);
+		goto done;
+	}
+	{
+		char *cp = strchr(pos, ' ');
+
+		if (cp)
+			*cp = '\0';
+		flag = tomoyo_correct_path(pos) || !strcmp(pos, "keep") ||
+			!strcmp(pos, "initialize") || !strcmp(pos, "reset") ||
+			!strcmp(pos, "child") || !strcmp(pos, "parent");
+		if (cp)
+			*cp = ' ';
+	}
+	if (!flag)
+		return pos;
+	e->transit = tomoyo_get_name(tomoyo_read_token(param));
+done:
+	if (e->transit)
+		return param->data;
+	/*
+	 * Return a bad read-only condition string that will let
+	 * tomoyo_get_condition() return NULL.
+	 */
+	return "/";
+}
+
+/**
+ * tomoyo_get_condition - Parse condition part.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
+ */
+struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param)
+{
+	struct tomoyo_condition *entry = NULL;
+	struct tomoyo_condition_element *condp = NULL;
+	struct tomoyo_number_union *numbers_p = NULL;
+	struct tomoyo_name_union *names_p = NULL;
+	struct tomoyo_argv *argv = NULL;
+	struct tomoyo_envp *envp = NULL;
+	struct tomoyo_condition e = { };
+	char * const start_of_string =
+		tomoyo_get_transit_preference(param, &e);
+	char * const end_of_string = start_of_string + strlen(start_of_string);
+	char *pos;
+
+rerun:
+	pos = start_of_string;
+	while (1) {
+		u8 left = -1;
+		u8 right = -1;
+		char *left_word = pos;
+		char *cp;
+		char *right_word;
+		bool is_not;
+
+		if (!*left_word)
+			break;
+		/*
+		 * Since left-hand condition does not allow use of "path_group"
+		 * or "number_group" and environment variable's names do not
+		 * accept '=', it is guaranteed that the original line consists
+		 * of one or more repetition of $left$operator$right blocks
+		 * where "$left is free from '=' and ' '" and "$operator is
+		 * either '=' or '!='" and "$right is free from ' '".
+		 * Therefore, we can reconstruct the original line at the end
+		 * of dry run even if we overwrite $operator with '\0'.
+		 */
+		cp = strchr(pos, ' ');
+		if (cp) {
+			*cp = '\0'; /* Will restore later. */
+			pos = cp + 1;
+		} else {
+			pos = "";
+		}
+		right_word = strchr(left_word, '=');
+		if (!right_word || right_word == left_word)
+			goto out;
+		is_not = *(right_word - 1) == '!';
+		if (is_not)
+			*(right_word++ - 1) = '\0'; /* Will restore later. */
+		else if (*(right_word + 1) != '=')
+			*right_word++ = '\0'; /* Will restore later. */
+		else
+			goto out;
+		dprintk(KERN_WARNING "%u: <%s>%s=<%s>\n", __LINE__, left_word,
+			is_not ? "!" : "", right_word);
+		if (!strcmp(left_word, "grant_log")) {
+			if (entry) {
+				if (is_not ||
+				    entry->grant_log != TOMOYO_GRANTLOG_AUTO)
+					goto out;
+				else if (!strcmp(right_word, "yes"))
+					entry->grant_log = TOMOYO_GRANTLOG_YES;
+				else if (!strcmp(right_word, "no"))
+					entry->grant_log = TOMOYO_GRANTLOG_NO;
+				else
+					goto out;
+			}
+			continue;
+		}
+		if (!strncmp(left_word, "exec.argv[", 10)) {
+			if (!argv) {
+				e.argc++;
+				e.condc++;
+			} else {
+				e.argc--;
+				e.condc--;
+				left = TOMOYO_ARGV_ENTRY;
+				argv->is_not = is_not;
+				if (!tomoyo_parse_argv(left_word + 10,
+						       right_word, argv++))
+					goto out;
+			}
+			goto store_value;
+		}
+		if (!strncmp(left_word, "exec.envp[\"", 11)) {
+			if (!envp) {
+				e.envc++;
+				e.condc++;
+			} else {
+				e.envc--;
+				e.condc--;
+				left = TOMOYO_ENVP_ENTRY;
+				envp->is_not = is_not;
+				if (!tomoyo_parse_envp(left_word + 11,
+						       right_word, envp++))
+					goto out;
+			}
+			goto store_value;
+		}
+		left = tomoyo_condition_type(left_word);
+		dprintk(KERN_WARNING "%u: <%s> left=%u\n", __LINE__, left_word,
+			left);
+		if (left == TOMOYO_MAX_CONDITION_KEYWORD) {
+			if (!numbers_p) {
+				e.numbers_count++;
+			} else {
+				e.numbers_count--;
+				left = TOMOYO_NUMBER_UNION;
+				param->data = left_word;
+				if (*left_word == '@' ||
+				    !tomoyo_parse_number_union(param,
+							       numbers_p++))
+					goto out;
+			}
+		}
+		if (!condp)
+			e.condc++;
+		else
+			e.condc--;
+		if (left == TOMOYO_EXEC_REALPATH ||
+		    left == TOMOYO_SYMLINK_TARGET) {
+			if (!names_p) {
+				e.names_count++;
+			} else {
+				e.names_count--;
+				right = TOMOYO_NAME_UNION;
+				param->data = right_word;
+				if (!tomoyo_parse_name_union_quoted(param,
+								    names_p++))
+					goto out;
+			}
+			goto store_value;
+		}
+		right = tomoyo_condition_type(right_word);
+		if (right == TOMOYO_MAX_CONDITION_KEYWORD) {
+			if (!numbers_p) {
+				e.numbers_count++;
+			} else {
+				e.numbers_count--;
+				right = TOMOYO_NUMBER_UNION;
+				param->data = right_word;
+				if (!tomoyo_parse_number_union(param,
+							       numbers_p++))
+					goto out;
+			}
+		}
+store_value:
+		if (!condp) {
+			dprintk(KERN_WARNING "%u: dry_run left=%u right=%u match=%u\n",
+				__LINE__, left, right, !is_not);
+			continue;
+		}
+		condp->left = left;
+		condp->right = right;
+		condp->equals = !is_not;
+		dprintk(KERN_WARNING "%u: left=%u right=%u match=%u\n",
+			__LINE__, condp->left, condp->right,
+			condp->equals);
+		condp++;
+	}
+	dprintk(KERN_INFO "%u: cond=%u numbers=%u names=%u ac=%u ec=%u\n",
+		__LINE__, e.condc, e.numbers_count, e.names_count, e.argc,
+		e.envc);
+	if (entry) {
+		BUG_ON(e.names_count | e.numbers_count | e.argc | e.envc |
+		       e.condc);
+		return tomoyo_commit_condition(entry);
+	}
+	e.size = sizeof(*entry)
+		+ e.condc * sizeof(struct tomoyo_condition_element)
+		+ e.numbers_count * sizeof(struct tomoyo_number_union)
+		+ e.names_count * sizeof(struct tomoyo_name_union)
+		+ e.argc * sizeof(struct tomoyo_argv)
+		+ e.envc * sizeof(struct tomoyo_envp);
+	entry = kzalloc(e.size, GFP_NOFS);
+	if (!entry)
+		goto out2;
+	*entry = e;
+	e.transit = NULL;
+	condp = (struct tomoyo_condition_element *) (entry + 1);
+	numbers_p = (struct tomoyo_number_union *) (condp + e.condc);
+	names_p = (struct tomoyo_name_union *) (numbers_p + e.numbers_count);
+	argv = (struct tomoyo_argv *) (names_p + e.names_count);
+	envp = (struct tomoyo_envp *) (argv + e.argc);
+	{
+		bool flag = false;
+
+		for (pos = start_of_string; pos < end_of_string; pos++) {
+			if (*pos)
+				continue;
+			if (flag) /* Restore " ". */
+				*pos = ' ';
+			else if (*(pos + 1) == '=') /* Restore "!=". */
+				*pos = '!';
+			else /* Restore "=". */
+				*pos = '=';
+			flag = !flag;
+		}
+	}
+	goto rerun;
+out:
+	dprintk(KERN_WARNING "%u: %s failed\n", __LINE__, __func__);
+	if (entry) {
+		tomoyo_del_condition(&entry->head.list);
+		kfree(entry);
+	}
+out2:
+	tomoyo_put_name(e.transit);
+	return NULL;
+}
+
+/**
+ * tomoyo_get_attributes - Revalidate "struct inode".
+ *
+ * @obj: Pointer to "struct tomoyo_obj_info".
+ *
+ * Returns nothing.
+ */
+void tomoyo_get_attributes(struct tomoyo_obj_info *obj)
+{
+	u8 i;
+	struct dentry *dentry = NULL;
+
+	for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
+		struct inode *inode;
+
+		switch (i) {
+		case TOMOYO_PATH1:
+			dentry = obj->path1.dentry;
+			if (!dentry)
+				continue;
+			break;
+		case TOMOYO_PATH2:
+			dentry = obj->path2.dentry;
+			if (!dentry)
+				continue;
+			break;
+		default:
+			if (!dentry)
+				continue;
+			dentry = dget_parent(dentry);
+			break;
+		}
+		inode = d_backing_inode(dentry);
+		if (inode) {
+			struct tomoyo_mini_stat *stat = &obj->stat[i];
+
+			stat->uid  = inode->i_uid;
+			stat->gid  = inode->i_gid;
+			stat->ino  = inode->i_ino;
+			stat->mode = inode->i_mode;
+			stat->dev  = inode->i_sb->s_dev;
+			stat->rdev = inode->i_rdev;
+			obj->stat_valid[i] = true;
+		}
+		if (i & 1) /* TOMOYO_PATH1_PARENT or TOMOYO_PATH2_PARENT */
+			dput(dentry);
+	}
+}
+
+/**
+ * tomoyo_condition - Check condition part.
+ *
+ * @r:    Pointer to "struct tomoyo_request_info".
+ * @cond: Pointer to "struct tomoyo_condition". Maybe NULL.
+ *
+ * Returns true on success, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+bool tomoyo_condition(struct tomoyo_request_info *r,
+		      const struct tomoyo_condition *cond)
+{
+	u32 i;
+	u64 min_v[2] = { 0, 0 };
+	u64 max_v[2] = { 0, 0 };
+	const struct tomoyo_condition_element *condp;
+	const struct tomoyo_number_union *numbers_p;
+	const struct tomoyo_name_union *names_p;
+	const struct tomoyo_argv *argv;
+	const struct tomoyo_envp *envp;
+	struct tomoyo_obj_info *obj;
+	u16 condc;
+	u16 argc;
+	u16 envc;
+	struct linux_binprm *bprm = NULL;
+
+	if (!cond)
+		return true;
+	condc = cond->condc;
+	argc = cond->argc;
+	envc = cond->envc;
+	obj = r->obj;
+	if (r->ee)
+		bprm = r->ee->bprm;
+	if (!bprm && (argc || envc))
+		return false;
+	condp = (struct tomoyo_condition_element *) (cond + 1);
+	numbers_p = (const struct tomoyo_number_union *) (condp + condc);
+	names_p = (const struct tomoyo_name_union *)
+		(numbers_p + cond->numbers_count);
+	argv = (const struct tomoyo_argv *) (names_p + cond->names_count);
+	envp = (const struct tomoyo_envp *) (argv + argc);
+	for (i = 0; i < condc; i++) {
+		const bool match = condp->equals;
+		const u8 left = condp->left;
+		const u8 right = condp->right;
+		bool is_bitop[2] = { false, false };
+		u8 j;
+
+		condp++;
+		/* Check argv[] and envp[] later. */
+		if (left == TOMOYO_ARGV_ENTRY || left == TOMOYO_ENVP_ENTRY)
+			continue;
+		/* Check string expressions. */
+		if (right == TOMOYO_NAME_UNION) {
+			const struct tomoyo_name_union *ptr = names_p++;
+			struct tomoyo_path_info *symlink;
+			struct tomoyo_execve *ee;
+			struct file *file;
+
+			switch (left) {
+			case TOMOYO_SYMLINK_TARGET:
+				symlink = obj ? obj->symlink_target : NULL;
+				if (!symlink ||
+				    !tomoyo_compare_name_union(symlink, ptr)
+				    == match)
+					goto out;
+				break;
+			case TOMOYO_EXEC_REALPATH:
+				ee = r->ee;
+				file = ee ? ee->bprm->file : NULL;
+				if (!tomoyo_scan_exec_realpath(file, ptr,
+							       match))
+					goto out;
+				break;
+			}
+			continue;
+		}
+		/* Check numeric or bit-op expressions. */
+		for (j = 0; j < 2; j++) {
+			const u8 index = j ? right : left;
+			u64 value = 0;
+
+			switch (index) {
+			case TOMOYO_TASK_UID:
+				value = from_kuid(&init_user_ns, current_uid());
+				break;
+			case TOMOYO_TASK_EUID:
+				value = from_kuid(&init_user_ns, current_euid());
+				break;
+			case TOMOYO_TASK_SUID:
+				value = from_kuid(&init_user_ns, current_suid());
+				break;
+			case TOMOYO_TASK_FSUID:
+				value = from_kuid(&init_user_ns, current_fsuid());
+				break;
+			case TOMOYO_TASK_GID:
+				value = from_kgid(&init_user_ns, current_gid());
+				break;
+			case TOMOYO_TASK_EGID:
+				value = from_kgid(&init_user_ns, current_egid());
+				break;
+			case TOMOYO_TASK_SGID:
+				value = from_kgid(&init_user_ns, current_sgid());
+				break;
+			case TOMOYO_TASK_FSGID:
+				value = from_kgid(&init_user_ns, current_fsgid());
+				break;
+			case TOMOYO_TASK_PID:
+				value = tomoyo_sys_getpid();
+				break;
+			case TOMOYO_TASK_PPID:
+				value = tomoyo_sys_getppid();
+				break;
+			case TOMOYO_TYPE_IS_SOCKET:
+				value = S_IFSOCK;
+				break;
+			case TOMOYO_TYPE_IS_SYMLINK:
+				value = S_IFLNK;
+				break;
+			case TOMOYO_TYPE_IS_FILE:
+				value = S_IFREG;
+				break;
+			case TOMOYO_TYPE_IS_BLOCK_DEV:
+				value = S_IFBLK;
+				break;
+			case TOMOYO_TYPE_IS_DIRECTORY:
+				value = S_IFDIR;
+				break;
+			case TOMOYO_TYPE_IS_CHAR_DEV:
+				value = S_IFCHR;
+				break;
+			case TOMOYO_TYPE_IS_FIFO:
+				value = S_IFIFO;
+				break;
+			case TOMOYO_MODE_SETUID:
+				value = S_ISUID;
+				break;
+			case TOMOYO_MODE_SETGID:
+				value = S_ISGID;
+				break;
+			case TOMOYO_MODE_STICKY:
+				value = S_ISVTX;
+				break;
+			case TOMOYO_MODE_OWNER_READ:
+				value = 0400;
+				break;
+			case TOMOYO_MODE_OWNER_WRITE:
+				value = 0200;
+				break;
+			case TOMOYO_MODE_OWNER_EXECUTE:
+				value = 0100;
+				break;
+			case TOMOYO_MODE_GROUP_READ:
+				value = 0040;
+				break;
+			case TOMOYO_MODE_GROUP_WRITE:
+				value = 0020;
+				break;
+			case TOMOYO_MODE_GROUP_EXECUTE:
+				value = 0010;
+				break;
+			case TOMOYO_MODE_OTHERS_READ:
+				value = 0004;
+				break;
+			case TOMOYO_MODE_OTHERS_WRITE:
+				value = 0002;
+				break;
+			case TOMOYO_MODE_OTHERS_EXECUTE:
+				value = 0001;
+				break;
+			case TOMOYO_EXEC_ARGC:
+				if (!bprm)
+					goto out;
+				value = bprm->argc;
+				break;
+			case TOMOYO_EXEC_ENVC:
+				if (!bprm)
+					goto out;
+				value = bprm->envc;
+				break;
+			case TOMOYO_NUMBER_UNION:
+				/* Fetch values later. */
+				break;
+			default:
+				if (!obj)
+					goto out;
+				if (!obj->validate_done) {
+					tomoyo_get_attributes(obj);
+					obj->validate_done = true;
+				}
+				{
+					u8 stat_index;
+					struct tomoyo_mini_stat *stat;
+
+					switch (index) {
+					case TOMOYO_PATH1_UID:
+					case TOMOYO_PATH1_GID:
+					case TOMOYO_PATH1_INO:
+					case TOMOYO_PATH1_MAJOR:
+					case TOMOYO_PATH1_MINOR:
+					case TOMOYO_PATH1_TYPE:
+					case TOMOYO_PATH1_DEV_MAJOR:
+					case TOMOYO_PATH1_DEV_MINOR:
+					case TOMOYO_PATH1_PERM:
+						stat_index = TOMOYO_PATH1;
+						break;
+					case TOMOYO_PATH2_UID:
+					case TOMOYO_PATH2_GID:
+					case TOMOYO_PATH2_INO:
+					case TOMOYO_PATH2_MAJOR:
+					case TOMOYO_PATH2_MINOR:
+					case TOMOYO_PATH2_TYPE:
+					case TOMOYO_PATH2_DEV_MAJOR:
+					case TOMOYO_PATH2_DEV_MINOR:
+					case TOMOYO_PATH2_PERM:
+						stat_index = TOMOYO_PATH2;
+						break;
+					case TOMOYO_PATH1_PARENT_UID:
+					case TOMOYO_PATH1_PARENT_GID:
+					case TOMOYO_PATH1_PARENT_INO:
+					case TOMOYO_PATH1_PARENT_PERM:
+						stat_index =
+							TOMOYO_PATH1_PARENT;
+						break;
+					case TOMOYO_PATH2_PARENT_UID:
+					case TOMOYO_PATH2_PARENT_GID:
+					case TOMOYO_PATH2_PARENT_INO:
+					case TOMOYO_PATH2_PARENT_PERM:
+						stat_index =
+							TOMOYO_PATH2_PARENT;
+						break;
+					default:
+						goto out;
+					}
+					if (!obj->stat_valid[stat_index])
+						goto out;
+					stat = &obj->stat[stat_index];
+					switch (index) {
+					case TOMOYO_PATH1_UID:
+					case TOMOYO_PATH2_UID:
+					case TOMOYO_PATH1_PARENT_UID:
+					case TOMOYO_PATH2_PARENT_UID:
+						value = from_kuid(&init_user_ns, stat->uid);
+						break;
+					case TOMOYO_PATH1_GID:
+					case TOMOYO_PATH2_GID:
+					case TOMOYO_PATH1_PARENT_GID:
+					case TOMOYO_PATH2_PARENT_GID:
+						value = from_kgid(&init_user_ns, stat->gid);
+						break;
+					case TOMOYO_PATH1_INO:
+					case TOMOYO_PATH2_INO:
+					case TOMOYO_PATH1_PARENT_INO:
+					case TOMOYO_PATH2_PARENT_INO:
+						value = stat->ino;
+						break;
+					case TOMOYO_PATH1_MAJOR:
+					case TOMOYO_PATH2_MAJOR:
+						value = MAJOR(stat->dev);
+						break;
+					case TOMOYO_PATH1_MINOR:
+					case TOMOYO_PATH2_MINOR:
+						value = MINOR(stat->dev);
+						break;
+					case TOMOYO_PATH1_TYPE:
+					case TOMOYO_PATH2_TYPE:
+						value = stat->mode & S_IFMT;
+						break;
+					case TOMOYO_PATH1_DEV_MAJOR:
+					case TOMOYO_PATH2_DEV_MAJOR:
+						value = MAJOR(stat->rdev);
+						break;
+					case TOMOYO_PATH1_DEV_MINOR:
+					case TOMOYO_PATH2_DEV_MINOR:
+						value = MINOR(stat->rdev);
+						break;
+					case TOMOYO_PATH1_PERM:
+					case TOMOYO_PATH2_PERM:
+					case TOMOYO_PATH1_PARENT_PERM:
+					case TOMOYO_PATH2_PARENT_PERM:
+						value = stat->mode & S_IALLUGO;
+						break;
+					}
+				}
+				break;
+			}
+			max_v[j] = value;
+			min_v[j] = value;
+			switch (index) {
+			case TOMOYO_MODE_SETUID:
+			case TOMOYO_MODE_SETGID:
+			case TOMOYO_MODE_STICKY:
+			case TOMOYO_MODE_OWNER_READ:
+			case TOMOYO_MODE_OWNER_WRITE:
+			case TOMOYO_MODE_OWNER_EXECUTE:
+			case TOMOYO_MODE_GROUP_READ:
+			case TOMOYO_MODE_GROUP_WRITE:
+			case TOMOYO_MODE_GROUP_EXECUTE:
+			case TOMOYO_MODE_OTHERS_READ:
+			case TOMOYO_MODE_OTHERS_WRITE:
+			case TOMOYO_MODE_OTHERS_EXECUTE:
+				is_bitop[j] = true;
+			}
+		}
+		if (left == TOMOYO_NUMBER_UNION) {
+			/* Fetch values now. */
+			const struct tomoyo_number_union *ptr = numbers_p++;
+
+			min_v[0] = ptr->values[0];
+			max_v[0] = ptr->values[1];
+		}
+		if (right == TOMOYO_NUMBER_UNION) {
+			/* Fetch values now. */
+			const struct tomoyo_number_union *ptr = numbers_p++;
+
+			if (ptr->group) {
+				if (tomoyo_number_matches_group(min_v[0],
+								max_v[0],
+								ptr->group)
+				    == match)
+					continue;
+			} else {
+				if ((min_v[0] <= ptr->values[1] &&
+				     max_v[0] >= ptr->values[0]) == match)
+					continue;
+			}
+			goto out;
+		}
+		/*
+		 * Bit operation is valid only when counterpart value
+		 * represents permission.
+		 */
+		if (is_bitop[0] && is_bitop[1]) {
+			goto out;
+		} else if (is_bitop[0]) {
+			switch (right) {
+			case TOMOYO_PATH1_PERM:
+			case TOMOYO_PATH1_PARENT_PERM:
+			case TOMOYO_PATH2_PERM:
+			case TOMOYO_PATH2_PARENT_PERM:
+				if (!(max_v[0] & max_v[1]) == !match)
+					continue;
+			}
+			goto out;
+		} else if (is_bitop[1]) {
+			switch (left) {
+			case TOMOYO_PATH1_PERM:
+			case TOMOYO_PATH1_PARENT_PERM:
+			case TOMOYO_PATH2_PERM:
+			case TOMOYO_PATH2_PARENT_PERM:
+				if (!(max_v[0] & max_v[1]) == !match)
+					continue;
+			}
+			goto out;
+		}
+		/* Normal value range comparison. */
+		if ((min_v[0] <= max_v[1] && max_v[0] >= min_v[1]) == match)
+			continue;
+out:
+		return false;
+	}
+	/* Check argv[] and envp[] now. */
+	if (r->ee && (argc || envc))
+		return tomoyo_scan_bprm(r->ee, argc, argv, envc, envp);
+	return true;
+}
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
new file mode 100644
index 000000000..eeaad421f
--- /dev/null
+++ b/security/tomoyo/domain.c
@@ -0,0 +1,950 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/domain.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include "common.h"
+
+#include <linux/binfmts.h>
+#include <linux/slab.h>
+#include <linux/rculist.h>
+
+/* Variables definitions.*/
+
+/* The initial domain. */
+struct tomoyo_domain_info tomoyo_kernel_domain;
+
+/**
+ * tomoyo_update_policy - Update an entry for exception policy.
+ *
+ * @new_entry:       Pointer to "struct tomoyo_acl_info".
+ * @size:            Size of @new_entry in bytes.
+ * @param:           Pointer to "struct tomoyo_acl_param".
+ * @check_duplicate: Callback function to find duplicated entry.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
+			 struct tomoyo_acl_param *param,
+			 bool (*check_duplicate)(const struct tomoyo_acl_head
+						 *,
+						 const struct tomoyo_acl_head
+						 *))
+{
+	int error = param->is_delete ? -ENOENT : -ENOMEM;
+	struct tomoyo_acl_head *entry;
+	struct list_head *list = param->list;
+
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		return -ENOMEM;
+	list_for_each_entry_rcu(entry, list, list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
+			continue;
+		if (!check_duplicate(entry, new_entry))
+			continue;
+		entry->is_deleted = param->is_delete;
+		error = 0;
+		break;
+	}
+	if (error && !param->is_delete) {
+		entry = tomoyo_commit_ok(new_entry, size);
+		if (entry) {
+			list_add_tail_rcu(&entry->list, list);
+			error = 0;
+		}
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+	return error;
+}
+
+/**
+ * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a,
+					const struct tomoyo_acl_info *b)
+{
+	return a->type == b->type && a->cond == b->cond;
+}
+
+/**
+ * tomoyo_update_domain - Update an entry for domain policy.
+ *
+ * @new_entry:       Pointer to "struct tomoyo_acl_info".
+ * @size:            Size of @new_entry in bytes.
+ * @param:           Pointer to "struct tomoyo_acl_param".
+ * @check_duplicate: Callback function to find duplicated entry.
+ * @merge_duplicate: Callback function to merge duplicated entry.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
+			 struct tomoyo_acl_param *param,
+			 bool (*check_duplicate)(const struct tomoyo_acl_info
+						 *,
+						 const struct tomoyo_acl_info
+						 *),
+			 bool (*merge_duplicate)(struct tomoyo_acl_info *,
+						 struct tomoyo_acl_info *,
+						 const bool))
+{
+	const bool is_delete = param->is_delete;
+	int error = is_delete ? -ENOENT : -ENOMEM;
+	struct tomoyo_acl_info *entry;
+	struct list_head * const list = param->list;
+
+	if (param->data[0]) {
+		new_entry->cond = tomoyo_get_condition(param);
+		if (!new_entry->cond)
+			return -EINVAL;
+		/*
+		 * Domain transition preference is allowed for only
+		 * "file execute" entries.
+		 */
+		if (new_entry->cond->transit &&
+		    !(new_entry->type == TOMOYO_TYPE_PATH_ACL &&
+		      container_of(new_entry, struct tomoyo_path_acl, head)
+		      ->perm == 1 << TOMOYO_TYPE_EXECUTE))
+			goto out;
+	}
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		goto out;
+	list_for_each_entry_rcu(entry, list, list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
+			continue;
+		if (!tomoyo_same_acl_head(entry, new_entry) ||
+		    !check_duplicate(entry, new_entry))
+			continue;
+		if (merge_duplicate)
+			entry->is_deleted = merge_duplicate(entry, new_entry,
+							    is_delete);
+		else
+			entry->is_deleted = is_delete;
+		error = 0;
+		break;
+	}
+	if (error && !is_delete) {
+		entry = tomoyo_commit_ok(new_entry, size);
+		if (entry) {
+			list_add_tail_rcu(&entry->list, list);
+			error = 0;
+		}
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+out:
+	tomoyo_put_condition(new_entry->cond);
+	return error;
+}
+
+/**
+ * tomoyo_check_acl - Do permission check.
+ *
+ * @r:           Pointer to "struct tomoyo_request_info".
+ * @check_entry: Callback function to check type specific parameters.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+void tomoyo_check_acl(struct tomoyo_request_info *r,
+		      bool (*check_entry)(struct tomoyo_request_info *,
+					  const struct tomoyo_acl_info *))
+{
+	const struct tomoyo_domain_info *domain = r->domain;
+	struct tomoyo_acl_info *ptr;
+	const struct list_head *list = &domain->acl_info_list;
+	u16 i = 0;
+
+retry:
+	list_for_each_entry_rcu(ptr, list, list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		if (ptr->is_deleted || ptr->type != r->param_type)
+			continue;
+		if (!check_entry(r, ptr))
+			continue;
+		if (!tomoyo_condition(r, ptr->cond))
+			continue;
+		r->matched_acl = ptr;
+		r->granted = true;
+		return;
+	}
+	for (; i < TOMOYO_MAX_ACL_GROUPS; i++) {
+		if (!test_bit(i, domain->group))
+			continue;
+		list = &domain->ns->acl_group[i++];
+		goto retry;
+	}
+	r->granted = false;
+}
+
+/* The list for "struct tomoyo_domain_info". */
+LIST_HEAD(tomoyo_domain_list);
+
+/**
+ * tomoyo_last_word - Get last component of a domainname.
+ *
+ * @name: Domainname to check.
+ *
+ * Returns the last word of @domainname.
+ */
+static const char *tomoyo_last_word(const char *name)
+{
+	const char *cp = strrchr(name, ' ');
+
+	if (cp)
+		return cp + 1;
+	return name;
+}
+
+/**
+ * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_head".
+ * @b: Pointer to "struct tomoyo_acl_head".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a,
+					   const struct tomoyo_acl_head *b)
+{
+	const struct tomoyo_transition_control *p1 = container_of(a,
+								  typeof(*p1),
+								  head);
+	const struct tomoyo_transition_control *p2 = container_of(b,
+								  typeof(*p2),
+								  head);
+
+	return p1->type == p2->type && p1->is_last_name == p2->is_last_name
+		&& p1->domainname == p2->domainname
+		&& p1->program == p2->program;
+}
+
+/**
+ * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ * @type:  Type of this entry.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
+				    const u8 type)
+{
+	struct tomoyo_transition_control e = { .type = type };
+	int error = param->is_delete ? -ENOENT : -ENOMEM;
+	char *program = param->data;
+	char *domainname = strstr(program, " from ");
+
+	if (domainname) {
+		*domainname = '\0';
+		domainname += 6;
+	} else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP ||
+		   type == TOMOYO_TRANSITION_CONTROL_KEEP) {
+		domainname = program;
+		program = NULL;
+	}
+	if (program && strcmp(program, "any")) {
+		if (!tomoyo_correct_path(program))
+			return -EINVAL;
+		e.program = tomoyo_get_name(program);
+		if (!e.program)
+			goto out;
+	}
+	if (domainname && strcmp(domainname, "any")) {
+		if (!tomoyo_correct_domain(domainname)) {
+			if (!tomoyo_correct_path(domainname))
+				goto out;
+			e.is_last_name = true;
+		}
+		e.domainname = tomoyo_get_name(domainname);
+		if (!e.domainname)
+			goto out;
+	}
+	param->list = &param->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
+	error = tomoyo_update_policy(&e.head, sizeof(e), param,
+				     tomoyo_same_transition_control);
+out:
+	tomoyo_put_name(e.domainname);
+	tomoyo_put_name(e.program);
+	return error;
+}
+
+/**
+ * tomoyo_scan_transition - Try to find specific domain transition type.
+ *
+ * @list:       Pointer to "struct list_head".
+ * @domainname: The name of current domain.
+ * @program:    The name of requested program.
+ * @last_name:  The last component of @domainname.
+ * @type:       One of values in "enum tomoyo_transition_type".
+ *
+ * Returns true if found one, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static inline bool tomoyo_scan_transition
+(const struct list_head *list, const struct tomoyo_path_info *domainname,
+ const struct tomoyo_path_info *program, const char *last_name,
+ const enum tomoyo_transition_type type)
+{
+	const struct tomoyo_transition_control *ptr;
+
+	list_for_each_entry_rcu(ptr, list, head.list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		if (ptr->head.is_deleted || ptr->type != type)
+			continue;
+		if (ptr->domainname) {
+			if (!ptr->is_last_name) {
+				if (ptr->domainname != domainname)
+					continue;
+			} else {
+				/*
+				 * Use direct strcmp() since this is
+				 * unlikely used.
+				 */
+				if (strcmp(ptr->domainname->name, last_name))
+					continue;
+			}
+		}
+		if (ptr->program && tomoyo_pathcmp(ptr->program, program))
+			continue;
+		return true;
+	}
+	return false;
+}
+
+/**
+ * tomoyo_transition_type - Get domain transition type.
+ *
+ * @ns:         Pointer to "struct tomoyo_policy_namespace".
+ * @domainname: The name of current domain.
+ * @program:    The name of requested program.
+ *
+ * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes
+ * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if
+ * executing @program reinitializes domain transition within that namespace,
+ * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname ,
+ * others otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static enum tomoyo_transition_type tomoyo_transition_type
+(const struct tomoyo_policy_namespace *ns,
+ const struct tomoyo_path_info *domainname,
+ const struct tomoyo_path_info *program)
+{
+	const char *last_name = tomoyo_last_word(domainname->name);
+	enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET;
+
+	while (type < TOMOYO_MAX_TRANSITION_TYPE) {
+		const struct list_head * const list =
+			&ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
+
+		if (!tomoyo_scan_transition(list, domainname, program,
+					    last_name, type)) {
+			type++;
+			continue;
+		}
+		if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET &&
+		    type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE)
+			break;
+		/*
+		 * Do not check for reset_domain if no_reset_domain matched.
+		 * Do not check for initialize_domain if no_initialize_domain
+		 * matched.
+		 */
+		type++;
+		type++;
+	}
+	return type;
+}
+
+/**
+ * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_head".
+ * @b: Pointer to "struct tomoyo_acl_head".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a,
+				   const struct tomoyo_acl_head *b)
+{
+	const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1),
+							  head);
+	const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2),
+							  head);
+
+	return p1->original_name == p2->original_name &&
+		p1->aggregated_name == p2->aggregated_name;
+}
+
+/**
+ * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+int tomoyo_write_aggregator(struct tomoyo_acl_param *param)
+{
+	struct tomoyo_aggregator e = { };
+	int error = param->is_delete ? -ENOENT : -ENOMEM;
+	const char *original_name = tomoyo_read_token(param);
+	const char *aggregated_name = tomoyo_read_token(param);
+
+	if (!tomoyo_correct_word(original_name) ||
+	    !tomoyo_correct_path(aggregated_name))
+		return -EINVAL;
+	e.original_name = tomoyo_get_name(original_name);
+	e.aggregated_name = tomoyo_get_name(aggregated_name);
+	if (!e.original_name || !e.aggregated_name ||
+	    e.aggregated_name->is_patterned) /* No patterns allowed. */
+		goto out;
+	param->list = &param->ns->policy_list[TOMOYO_ID_AGGREGATOR];
+	error = tomoyo_update_policy(&e.head, sizeof(e), param,
+				     tomoyo_same_aggregator);
+out:
+	tomoyo_put_name(e.original_name);
+	tomoyo_put_name(e.aggregated_name);
+	return error;
+}
+
+/**
+ * tomoyo_find_namespace - Find specified namespace.
+ *
+ * @name: Name of namespace to find.
+ * @len:  Length of @name.
+ *
+ * Returns pointer to "struct tomoyo_policy_namespace" if found,
+ * NULL otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static struct tomoyo_policy_namespace *tomoyo_find_namespace
+(const char *name, const unsigned int len)
+{
+	struct tomoyo_policy_namespace *ns;
+
+	list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
+		if (strncmp(name, ns->name, len) ||
+		    (name[len] && name[len] != ' '))
+			continue;
+		return ns;
+	}
+	return NULL;
+}
+
+/**
+ * tomoyo_assign_namespace - Create a new namespace.
+ *
+ * @domainname: Name of namespace to create.
+ *
+ * Returns pointer to "struct tomoyo_policy_namespace" on success,
+ * NULL otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname)
+{
+	struct tomoyo_policy_namespace *ptr;
+	struct tomoyo_policy_namespace *entry;
+	const char *cp = domainname;
+	unsigned int len = 0;
+
+	while (*cp && *cp++ != ' ')
+		len++;
+	ptr = tomoyo_find_namespace(domainname, len);
+	if (ptr)
+		return ptr;
+	if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname))
+		return NULL;
+	entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS | __GFP_NOWARN);
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		goto out;
+	ptr = tomoyo_find_namespace(domainname, len);
+	if (!ptr && tomoyo_memory_ok(entry)) {
+		char *name = (char *) (entry + 1);
+
+		ptr = entry;
+		memmove(name, domainname, len);
+		name[len] = '\0';
+		entry->name = name;
+		tomoyo_init_policy_namespace(entry);
+		entry = NULL;
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+out:
+	kfree(entry);
+	return ptr;
+}
+
+/**
+ * tomoyo_namespace_jump - Check for namespace jump.
+ *
+ * @domainname: Name of domain.
+ *
+ * Returns true if namespace differs, false otherwise.
+ */
+static bool tomoyo_namespace_jump(const char *domainname)
+{
+	const char *namespace = tomoyo_current_namespace()->name;
+	const int len = strlen(namespace);
+
+	return strncmp(domainname, namespace, len) ||
+		(domainname[len] && domainname[len] != ' ');
+}
+
+/**
+ * tomoyo_assign_domain - Create a domain or a namespace.
+ *
+ * @domainname: The name of domain.
+ * @transit:    True if transit to domain found or created.
+ *
+ * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
+						const bool transit)
+{
+	struct tomoyo_domain_info e = { };
+	struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname);
+	bool created = false;
+
+	if (entry) {
+		if (transit) {
+			/*
+			 * Since namespace is created at runtime, profiles may
+			 * not be created by the moment the process transits to
+			 * that domain. Do not perform domain transition if
+			 * profile for that domain is not yet created.
+			 */
+			if (tomoyo_policy_loaded &&
+			    !entry->ns->profile_ptr[entry->profile])
+				return NULL;
+		}
+		return entry;
+	}
+	/* Requested domain does not exist. */
+	/* Don't create requested domain if domainname is invalid. */
+	if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 ||
+	    !tomoyo_correct_domain(domainname))
+		return NULL;
+	/*
+	 * Since definition of profiles and acl_groups may differ across
+	 * namespaces, do not inherit "use_profile" and "use_group" settings
+	 * by automatically creating requested domain upon domain transition.
+	 */
+	if (transit && tomoyo_namespace_jump(domainname))
+		return NULL;
+	e.ns = tomoyo_assign_namespace(domainname);
+	if (!e.ns)
+		return NULL;
+	/*
+	 * "use_profile" and "use_group" settings for automatically created
+	 * domains are inherited from current domain. These are 0 for manually
+	 * created domains.
+	 */
+	if (transit) {
+		const struct tomoyo_domain_info *domain = tomoyo_domain();
+
+		e.profile = domain->profile;
+		memcpy(e.group, domain->group, sizeof(e.group));
+	}
+	e.domainname = tomoyo_get_name(domainname);
+	if (!e.domainname)
+		return NULL;
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		goto out;
+	entry = tomoyo_find_domain(domainname);
+	if (!entry) {
+		entry = tomoyo_commit_ok(&e, sizeof(e));
+		if (entry) {
+			INIT_LIST_HEAD(&entry->acl_info_list);
+			list_add_tail_rcu(&entry->list, &tomoyo_domain_list);
+			created = true;
+		}
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+out:
+	tomoyo_put_name(e.domainname);
+	if (entry && transit) {
+		if (created) {
+			struct tomoyo_request_info r;
+			int i;
+
+			tomoyo_init_request_info(&r, entry,
+						 TOMOYO_MAC_FILE_EXECUTE);
+			r.granted = false;
+			tomoyo_write_log(&r, "use_profile %u\n",
+					 entry->profile);
+			for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++)
+				if (test_bit(i, entry->group))
+					tomoyo_write_log(&r, "use_group %u\n",
+							 i);
+			tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
+		}
+	}
+	return entry;
+}
+
+/**
+ * tomoyo_environ - Check permission for environment variable names.
+ *
+ * @ee: Pointer to "struct tomoyo_execve".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_environ(struct tomoyo_execve *ee)
+	__must_hold_shared(&tomoyo_ss)
+{
+	struct tomoyo_request_info *r = &ee->r;
+	struct linux_binprm *bprm = ee->bprm;
+	/* env_page.data is allocated by tomoyo_dump_page(). */
+	struct tomoyo_page_dump env_page = { };
+	char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */
+	int arg_len = 0;
+	unsigned long pos = bprm->p;
+	int offset = pos % PAGE_SIZE;
+	int argv_count = bprm->argc;
+	int envp_count = bprm->envc;
+	int error = -ENOMEM;
+
+	ee->r.type = TOMOYO_MAC_ENVIRON;
+	ee->r.profile = r->domain->profile;
+	ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile,
+				     TOMOYO_MAC_ENVIRON);
+	if (!r->mode || !envp_count)
+		return 0;
+	arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
+	if (!arg_ptr)
+		goto out;
+	while (error == -ENOMEM) {
+		if (!tomoyo_dump_page(bprm, pos, &env_page))
+			goto out;
+		pos += PAGE_SIZE - offset;
+		/* Read. */
+		while (argv_count && offset < PAGE_SIZE) {
+			if (!env_page.data[offset++])
+				argv_count--;
+		}
+		if (argv_count) {
+			offset = 0;
+			continue;
+		}
+		while (offset < PAGE_SIZE) {
+			const unsigned char c = env_page.data[offset++];
+
+			if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
+				if (c == '=') {
+					arg_ptr[arg_len++] = '\0';
+				} else if (c == '\\') {
+					arg_ptr[arg_len++] = '\\';
+					arg_ptr[arg_len++] = '\\';
+				} else if (c > ' ' && c < 127) {
+					arg_ptr[arg_len++] = c;
+				} else {
+					arg_ptr[arg_len++] = '\\';
+					arg_ptr[arg_len++] = (c >> 6) + '0';
+					arg_ptr[arg_len++]
+						= ((c >> 3) & 7) + '0';
+					arg_ptr[arg_len++] = (c & 7) + '0';
+				}
+			} else {
+				arg_ptr[arg_len] = '\0';
+			}
+			if (c)
+				continue;
+			if (tomoyo_env_perm(r, arg_ptr)) {
+				error = -EPERM;
+				break;
+			}
+			if (!--envp_count) {
+				error = 0;
+				break;
+			}
+			arg_len = 0;
+		}
+		offset = 0;
+	}
+out:
+	if (r->mode != TOMOYO_CONFIG_ENFORCING)
+		error = 0;
+	kfree(env_page.data);
+	kfree(arg_ptr);
+	return error;
+}
+
+/**
+ * tomoyo_find_next_domain - Find a domain.
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+int tomoyo_find_next_domain(struct linux_binprm *bprm)
+{
+	struct tomoyo_domain_info *old_domain = tomoyo_domain();
+	struct tomoyo_domain_info *domain = NULL;
+	const char *original_name = bprm->filename;
+	int retval = -ENOMEM;
+	bool reject_on_transition_failure = false;
+	const struct tomoyo_path_info *candidate;
+	struct tomoyo_path_info exename;
+	struct tomoyo_execve *ee = kzalloc_obj(*ee, GFP_NOFS);
+
+	if (!ee)
+		return -ENOMEM;
+	ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
+	if (!ee->tmp) {
+		kfree(ee);
+		return -ENOMEM;
+	}
+	/* ee->dump->data is allocated by tomoyo_dump_page(). */
+	tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE);
+	ee->r.ee = ee;
+	ee->bprm = bprm;
+	ee->r.obj = &ee->obj;
+	ee->obj.path1 = bprm->file->f_path;
+	/*
+	 * Get symlink's pathname of program, but fallback to realpath if
+	 * symlink's pathname does not exist or symlink's pathname refers
+	 * to proc filesystem (e.g. /dev/fd/<num> or /proc/self/fd/<num> ).
+	 */
+	exename.name = tomoyo_realpath_nofollow(original_name);
+	if (exename.name && !strncmp(exename.name, "proc:/", 6)) {
+		kfree(exename.name);
+		exename.name = NULL;
+	}
+	if (!exename.name) {
+		exename.name = tomoyo_realpath_from_path(&bprm->file->f_path);
+		if (!exename.name)
+			goto out;
+	}
+	tomoyo_fill_path_info(&exename);
+retry:
+	/* Check 'aggregator' directive. */
+	{
+		struct tomoyo_aggregator *ptr;
+		struct list_head *list =
+			&old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR];
+
+		/* Check 'aggregator' directive. */
+		candidate = &exename;
+		list_for_each_entry_rcu(ptr, list, head.list,
+					srcu_read_lock_held(&tomoyo_ss)) {
+			if (ptr->head.is_deleted ||
+			    !tomoyo_path_matches_pattern(&exename,
+							 ptr->original_name))
+				continue;
+			candidate = ptr->aggregated_name;
+			break;
+		}
+	}
+
+	/* Check execute permission. */
+	retval = tomoyo_execute_permission(&ee->r, candidate);
+	if (retval == TOMOYO_RETRY_REQUEST)
+		goto retry;
+	if (retval < 0)
+		goto out;
+	/*
+	 * To be able to specify domainnames with wildcards, use the
+	 * pathname specified in the policy (which may contain
+	 * wildcard) rather than the pathname passed to execve()
+	 * (which never contains wildcard).
+	 */
+	if (ee->r.param.path.matched_path)
+		candidate = ee->r.param.path.matched_path;
+
+	/*
+	 * Check for domain transition preference if "file execute" matched.
+	 * If preference is given, make execve() fail if domain transition
+	 * has failed, for domain transition preference should be used with
+	 * destination domain defined.
+	 */
+	if (ee->transition) {
+		const char *domainname = ee->transition->name;
+
+		reject_on_transition_failure = true;
+		if (!strcmp(domainname, "keep"))
+			goto force_keep_domain;
+		if (!strcmp(domainname, "child"))
+			goto force_child_domain;
+		if (!strcmp(domainname, "reset"))
+			goto force_reset_domain;
+		if (!strcmp(domainname, "initialize"))
+			goto force_initialize_domain;
+		if (!strcmp(domainname, "parent")) {
+			char *cp;
+
+			strscpy(ee->tmp, old_domain->domainname->name, TOMOYO_EXEC_TMPSIZE);
+			cp = strrchr(ee->tmp, ' ');
+			if (cp)
+				*cp = '\0';
+		} else if (*domainname == '<')
+			strscpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE);
+		else
+			snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
+				 old_domain->domainname->name, domainname);
+		goto force_jump_domain;
+	}
+	/*
+	 * No domain transition preference specified.
+	 * Calculate domain to transit to.
+	 */
+	switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname,
+				       candidate)) {
+	case TOMOYO_TRANSITION_CONTROL_RESET:
+force_reset_domain:
+		/* Transit to the root of specified namespace. */
+		snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>",
+			 candidate->name);
+		/*
+		 * Make execve() fail if domain transition across namespaces
+		 * has failed.
+		 */
+		reject_on_transition_failure = true;
+		break;
+	case TOMOYO_TRANSITION_CONTROL_INITIALIZE:
+force_initialize_domain:
+		/* Transit to the child of current namespace's root. */
+		snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
+			 old_domain->ns->name, candidate->name);
+		break;
+	case TOMOYO_TRANSITION_CONTROL_KEEP:
+force_keep_domain:
+		/* Keep current domain. */
+		domain = old_domain;
+		break;
+	default:
+		if (old_domain == &tomoyo_kernel_domain &&
+		    !tomoyo_policy_loaded) {
+			/*
+			 * Needn't to transit from kernel domain before
+			 * starting /sbin/init. But transit from kernel domain
+			 * if executing initializers because they might start
+			 * before /sbin/init.
+			 */
+			domain = old_domain;
+			break;
+		}
+force_child_domain:
+		/* Normal domain transition. */
+		snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
+			 old_domain->domainname->name, candidate->name);
+		break;
+	}
+force_jump_domain:
+	if (!domain)
+		domain = tomoyo_assign_domain(ee->tmp, true);
+	if (domain)
+		retval = 0;
+	else if (reject_on_transition_failure) {
+		pr_warn("ERROR: Domain '%s' not ready.\n", ee->tmp);
+		retval = -ENOMEM;
+	} else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING)
+		retval = -ENOMEM;
+	else {
+		retval = 0;
+		if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) {
+			old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true;
+			ee->r.granted = false;
+			tomoyo_write_log(&ee->r, "%s", tomoyo_dif
+					 [TOMOYO_DIF_TRANSITION_FAILED]);
+			pr_warn("ERROR: Domain '%s' not defined.\n", ee->tmp);
+		}
+	}
+ out:
+	if (!domain)
+		domain = old_domain;
+	/* Update reference count on "struct tomoyo_domain_info". */
+	{
+		struct tomoyo_task *s = tomoyo_task(current);
+
+		s->old_domain_info = s->domain_info;
+		s->domain_info = domain;
+		atomic_inc(&domain->users);
+	}
+	kfree(exename.name);
+	if (!retval) {
+		ee->r.domain = domain;
+		retval = tomoyo_environ(ee);
+	}
+	kfree(ee->tmp);
+	kfree(ee->dump.data);
+	kfree(ee);
+	return retval;
+}
+
+/**
+ * tomoyo_dump_page - Dump a page to buffer.
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ * @pos:  Location to dump.
+ * @dump: Pointer to "struct tomoyo_page_dump".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
+		      struct tomoyo_page_dump *dump)
+{
+	struct page *page;
+#ifdef CONFIG_MMU
+	int ret;
+#endif
+
+	/* dump->data is released by tomoyo_find_next_domain(). */
+	if (!dump->data) {
+		dump->data = kzalloc(PAGE_SIZE, GFP_NOFS);
+		if (!dump->data)
+			return false;
+	}
+	/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */
+#ifdef CONFIG_MMU
+	/*
+	 * This is called at execve() time in order to dig around
+	 * in the argv/environment of the new process
+	 * (represented by bprm).
+	 */
+	mmap_read_lock(bprm->mm);
+	ret = get_user_pages_remote(bprm->mm, pos, 1,
+				    FOLL_FORCE, &page, NULL);
+	mmap_read_unlock(bprm->mm);
+	if (ret <= 0)
+		return false;
+#else
+	page = bprm->page[pos / PAGE_SIZE];
+#endif
+	if (page != dump->page) {
+		const unsigned int offset = pos % PAGE_SIZE;
+		char *kaddr = kmap_local_page(page);
+
+		dump->page = page;
+		memcpy(dump->data + offset, kaddr + offset,
+		       PAGE_SIZE - offset);
+		kunmap_local(kaddr);
+	}
+	/* Same with put_arg_page(page) in fs/exec.c */
+#ifdef CONFIG_MMU
+	put_page(page);
+#endif
+	return true;
+}
diff --git a/security/tomoyo/environ.c b/security/tomoyo/environ.c
new file mode 100644
index 000000000..bcb05910f
--- /dev/null
+++ b/security/tomoyo/environ.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/environ.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include "common.h"
+
+/**
+ * tomoyo_check_env_acl - Check permission for environment variable's name.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
+static bool tomoyo_check_env_acl(struct tomoyo_request_info *r,
+				 const struct tomoyo_acl_info *ptr)
+{
+	const struct tomoyo_env_acl *acl =
+		container_of(ptr, typeof(*acl), head);
+
+	return tomoyo_path_matches_pattern(r->param.environ.name, acl->env);
+}
+
+/**
+ * tomoyo_audit_env_log - Audit environment variable name log.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_audit_env_log(struct tomoyo_request_info *r)
+	__must_hold_shared(&tomoyo_ss)
+{
+	return tomoyo_supervisor(r, "misc env %s\n",
+				 r->param.environ.name->name);
+}
+
+/**
+ * tomoyo_env_perm - Check permission for environment variable's name.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @env: The name of environment variable.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+int tomoyo_env_perm(struct tomoyo_request_info *r, const char *env)
+{
+	struct tomoyo_path_info environ;
+	int error;
+
+	if (!env || !*env)
+		return 0;
+	environ.name = env;
+	tomoyo_fill_path_info(&environ);
+	r->param_type = TOMOYO_TYPE_ENV_ACL;
+	r->param.environ.name = &environ;
+	do {
+		tomoyo_check_acl(r, tomoyo_check_env_acl);
+		error = tomoyo_audit_env_log(r);
+	} while (error == TOMOYO_RETRY_REQUEST);
+	return error;
+}
+
+/**
+ * tomoyo_same_env_acl - Check for duplicated "struct tomoyo_env_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_env_acl(const struct tomoyo_acl_info *a,
+				const struct tomoyo_acl_info *b)
+{
+	const struct tomoyo_env_acl *p1 = container_of(a, typeof(*p1), head);
+	const struct tomoyo_env_acl *p2 = container_of(b, typeof(*p2), head);
+
+	return p1->env == p2->env;
+}
+
+/**
+ * tomoyo_write_env - Write "struct tomoyo_env_acl" list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_env(struct tomoyo_acl_param *param)
+{
+	struct tomoyo_env_acl e = { .head.type = TOMOYO_TYPE_ENV_ACL };
+	int error = -ENOMEM;
+	const char *data = tomoyo_read_token(param);
+
+	if (!tomoyo_correct_word(data) || strchr(data, '='))
+		return -EINVAL;
+	e.env = tomoyo_get_name(data);
+	if (!e.env)
+		return error;
+	error = tomoyo_update_domain(&e.head, sizeof(e), param,
+				  tomoyo_same_env_acl, NULL);
+	tomoyo_put_name(e.env);
+	return error;
+}
+
+/**
+ * tomoyo_write_misc - Update environment variable list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_write_misc(struct tomoyo_acl_param *param)
+{
+	if (tomoyo_str_starts(&param->data, "env "))
+		return tomoyo_write_env(param);
+	return -EINVAL;
+}
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
new file mode 100644
index 000000000..e9b67dbb3
--- /dev/null
+++ b/security/tomoyo/file.c
@@ -0,0 +1,1050 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/file.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include "common.h"
+#include <linux/slab.h>
+
+/*
+ * Mapping table from "enum tomoyo_path_acl_index" to "enum tomoyo_mac_index".
+ */
+static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
+	[TOMOYO_TYPE_EXECUTE]    = TOMOYO_MAC_FILE_EXECUTE,
+	[TOMOYO_TYPE_READ]       = TOMOYO_MAC_FILE_OPEN,
+	[TOMOYO_TYPE_WRITE]      = TOMOYO_MAC_FILE_OPEN,
+	[TOMOYO_TYPE_APPEND]     = TOMOYO_MAC_FILE_OPEN,
+	[TOMOYO_TYPE_UNLINK]     = TOMOYO_MAC_FILE_UNLINK,
+	[TOMOYO_TYPE_GETATTR]    = TOMOYO_MAC_FILE_GETATTR,
+	[TOMOYO_TYPE_RMDIR]      = TOMOYO_MAC_FILE_RMDIR,
+	[TOMOYO_TYPE_TRUNCATE]   = TOMOYO_MAC_FILE_TRUNCATE,
+	[TOMOYO_TYPE_SYMLINK]    = TOMOYO_MAC_FILE_SYMLINK,
+	[TOMOYO_TYPE_CHROOT]     = TOMOYO_MAC_FILE_CHROOT,
+	[TOMOYO_TYPE_UMOUNT]     = TOMOYO_MAC_FILE_UMOUNT,
+};
+
+/*
+ * Mapping table from "enum tomoyo_mkdev_acl_index" to "enum tomoyo_mac_index".
+ */
+const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = {
+	[TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK,
+	[TOMOYO_TYPE_MKCHAR]  = TOMOYO_MAC_FILE_MKCHAR,
+};
+
+/*
+ * Mapping table from "enum tomoyo_path2_acl_index" to "enum tomoyo_mac_index".
+ */
+const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = {
+	[TOMOYO_TYPE_LINK]       = TOMOYO_MAC_FILE_LINK,
+	[TOMOYO_TYPE_RENAME]     = TOMOYO_MAC_FILE_RENAME,
+	[TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT,
+};
+
+/*
+ * Mapping table from "enum tomoyo_path_number_acl_index" to
+ * "enum tomoyo_mac_index".
+ */
+const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
+	[TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE,
+	[TOMOYO_TYPE_MKDIR]  = TOMOYO_MAC_FILE_MKDIR,
+	[TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO,
+	[TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK,
+	[TOMOYO_TYPE_IOCTL]  = TOMOYO_MAC_FILE_IOCTL,
+	[TOMOYO_TYPE_CHMOD]  = TOMOYO_MAC_FILE_CHMOD,
+	[TOMOYO_TYPE_CHOWN]  = TOMOYO_MAC_FILE_CHOWN,
+	[TOMOYO_TYPE_CHGRP]  = TOMOYO_MAC_FILE_CHGRP,
+};
+
+/**
+ * tomoyo_put_name_union - Drop reference on "struct tomoyo_name_union".
+ *
+ * @ptr: Pointer to "struct tomoyo_name_union".
+ *
+ * Returns nothing.
+ */
+void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
+{
+	tomoyo_put_group(ptr->group);
+	tomoyo_put_name(ptr->filename);
+}
+
+/**
+ * tomoyo_compare_name_union - Check whether a name matches "struct tomoyo_name_union" or not.
+ *
+ * @name: Pointer to "struct tomoyo_path_info".
+ * @ptr:  Pointer to "struct tomoyo_name_union".
+ *
+ * Returns "struct tomoyo_path_info" if @name matches @ptr, NULL otherwise.
+ */
+const struct tomoyo_path_info *
+tomoyo_compare_name_union(const struct tomoyo_path_info *name,
+			  const struct tomoyo_name_union *ptr)
+{
+	if (ptr->group)
+		return tomoyo_path_matches_group(name, ptr->group);
+	if (tomoyo_path_matches_pattern(name, ptr->filename))
+		return ptr->filename;
+	return NULL;
+}
+
+/**
+ * tomoyo_put_number_union - Drop reference on "struct tomoyo_number_union".
+ *
+ * @ptr: Pointer to "struct tomoyo_number_union".
+ *
+ * Returns nothing.
+ */
+void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
+{
+	tomoyo_put_group(ptr->group);
+}
+
+/**
+ * tomoyo_compare_number_union - Check whether a value matches "struct tomoyo_number_union" or not.
+ *
+ * @value: Number to check.
+ * @ptr:   Pointer to "struct tomoyo_number_union".
+ *
+ * Returns true if @value matches @ptr, false otherwise.
+ */
+bool tomoyo_compare_number_union(const unsigned long value,
+				 const struct tomoyo_number_union *ptr)
+{
+	if (ptr->group)
+		return tomoyo_number_matches_group(value, value, ptr->group);
+	return value >= ptr->values[0] && value <= ptr->values[1];
+}
+
+/**
+ * tomoyo_add_slash - Add trailing '/' if needed.
+ *
+ * @buf: Pointer to "struct tomoyo_path_info".
+ *
+ * Returns nothing.
+ *
+ * @buf must be generated by tomoyo_encode() because this function does not
+ * allocate memory for adding '/'.
+ */
+static void tomoyo_add_slash(struct tomoyo_path_info *buf)
+{
+	if (buf->is_dir)
+		return;
+	/*
+	 * This is OK because tomoyo_encode() reserves space for appending "/".
+	 */
+	strcat((char *) buf->name, "/");
+	tomoyo_fill_path_info(buf);
+}
+
+/**
+ * tomoyo_get_realpath - Get realpath.
+ *
+ * @buf:  Pointer to "struct tomoyo_path_info".
+ * @path: Pointer to "struct path".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, const struct path *path)
+{
+	buf->name = tomoyo_realpath_from_path(path);
+	if (buf->name) {
+		tomoyo_fill_path_info(buf);
+		return true;
+	}
+	return false;
+}
+
+/**
+ * tomoyo_audit_path_log - Audit path request log.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_audit_path_log(struct tomoyo_request_info *r)
+	__must_hold_shared(&tomoyo_ss)
+{
+	return tomoyo_supervisor(r, "file %s %s\n", tomoyo_path_keyword
+				 [r->param.path.operation],
+				 r->param.path.filename->name);
+}
+
+/**
+ * tomoyo_audit_path2_log - Audit path/path request log.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_audit_path2_log(struct tomoyo_request_info *r)
+	__must_hold_shared(&tomoyo_ss)
+{
+	return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
+				 [tomoyo_pp2mac[r->param.path2.operation]],
+				 r->param.path2.filename1->name,
+				 r->param.path2.filename2->name);
+}
+
+/**
+ * tomoyo_audit_mkdev_log - Audit path/number/number/number request log.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r)
+	__must_hold_shared(&tomoyo_ss)
+{
+	return tomoyo_supervisor(r, "file %s %s 0%o %u %u\n",
+				 tomoyo_mac_keywords
+				 [tomoyo_pnnn2mac[r->param.mkdev.operation]],
+				 r->param.mkdev.filename->name,
+				 r->param.mkdev.mode, r->param.mkdev.major,
+				 r->param.mkdev.minor);
+}
+
+/**
+ * tomoyo_audit_path_number_log - Audit path/number request log.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r)
+	__must_hold_shared(&tomoyo_ss)
+{
+	const u8 type = r->param.path_number.operation;
+	u8 radix;
+	char buffer[64];
+
+	switch (type) {
+	case TOMOYO_TYPE_CREATE:
+	case TOMOYO_TYPE_MKDIR:
+	case TOMOYO_TYPE_MKFIFO:
+	case TOMOYO_TYPE_MKSOCK:
+	case TOMOYO_TYPE_CHMOD:
+		radix = TOMOYO_VALUE_TYPE_OCTAL;
+		break;
+	case TOMOYO_TYPE_IOCTL:
+		radix = TOMOYO_VALUE_TYPE_HEXADECIMAL;
+		break;
+	default:
+		radix = TOMOYO_VALUE_TYPE_DECIMAL;
+		break;
+	}
+	tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number,
+			   radix);
+	return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
+				 [tomoyo_pn2mac[type]],
+				 r->param.path_number.filename->name, buffer);
+}
+
+/**
+ * tomoyo_check_path_acl - Check permission for path operation.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ *
+ * To be able to use wildcard for domain transition, this function sets
+ * matching entry on success. Since the caller holds tomoyo_read_lock(),
+ * it is safe to set matching entry.
+ */
+static bool tomoyo_check_path_acl(struct tomoyo_request_info *r,
+				  const struct tomoyo_acl_info *ptr)
+{
+	const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl),
+							 head);
+
+	if (acl->perm & (1 << r->param.path.operation)) {
+		r->param.path.matched_path =
+			tomoyo_compare_name_union(r->param.path.filename,
+						  &acl->name);
+		return r->param.path.matched_path != NULL;
+	}
+	return false;
+}
+
+/**
+ * tomoyo_check_path_number_acl - Check permission for path number operation.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
+static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r,
+					 const struct tomoyo_acl_info *ptr)
+{
+	const struct tomoyo_path_number_acl *acl =
+		container_of(ptr, typeof(*acl), head);
+
+	return (acl->perm & (1 << r->param.path_number.operation)) &&
+		tomoyo_compare_number_union(r->param.path_number.number,
+					    &acl->number) &&
+		tomoyo_compare_name_union(r->param.path_number.filename,
+					  &acl->name);
+}
+
+/**
+ * tomoyo_check_path2_acl - Check permission for path path operation.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
+static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r,
+				   const struct tomoyo_acl_info *ptr)
+{
+	const struct tomoyo_path2_acl *acl =
+		container_of(ptr, typeof(*acl), head);
+
+	return (acl->perm & (1 << r->param.path2.operation)) &&
+		tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1)
+		&& tomoyo_compare_name_union(r->param.path2.filename2,
+					     &acl->name2);
+}
+
+/**
+ * tomoyo_check_mkdev_acl - Check permission for path number number number operation.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
+static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r,
+				   const struct tomoyo_acl_info *ptr)
+{
+	const struct tomoyo_mkdev_acl *acl =
+		container_of(ptr, typeof(*acl), head);
+
+	return (acl->perm & (1 << r->param.mkdev.operation)) &&
+		tomoyo_compare_number_union(r->param.mkdev.mode,
+					    &acl->mode) &&
+		tomoyo_compare_number_union(r->param.mkdev.major,
+					    &acl->major) &&
+		tomoyo_compare_number_union(r->param.mkdev.minor,
+					    &acl->minor) &&
+		tomoyo_compare_name_union(r->param.mkdev.filename,
+					  &acl->name);
+}
+
+/**
+ * tomoyo_same_path_acl - Check for duplicated "struct tomoyo_path_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b except permission bits, false otherwise.
+ */
+static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a,
+				 const struct tomoyo_acl_info *b)
+{
+	const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head);
+	const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head);
+
+	return tomoyo_same_name_union(&p1->name, &p2->name);
+}
+
+/**
+ * tomoyo_merge_path_acl - Merge duplicated "struct tomoyo_path_acl" entry.
+ *
+ * @a:         Pointer to "struct tomoyo_acl_info".
+ * @b:         Pointer to "struct tomoyo_acl_info".
+ * @is_delete: True for @a &= ~@b, false for @a |= @b.
+ *
+ * Returns true if @a is empty, false otherwise.
+ */
+static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a,
+				  struct tomoyo_acl_info *b,
+				  const bool is_delete)
+{
+	u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head)
+		->perm;
+	u16 perm = READ_ONCE(*a_perm);
+	const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm;
+
+	if (is_delete)
+		perm &= ~b_perm;
+	else
+		perm |= b_perm;
+	WRITE_ONCE(*a_perm, perm);
+	return !perm;
+}
+
+/**
+ * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list.
+ *
+ * @perm:  Permission.
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_update_path_acl(const u16 perm,
+				  struct tomoyo_acl_param *param)
+{
+	struct tomoyo_path_acl e = {
+		.head.type = TOMOYO_TYPE_PATH_ACL,
+		.perm = perm
+	};
+	int error;
+
+	if (!tomoyo_parse_name_union(param, &e.name))
+		error = -EINVAL;
+	else
+		error = tomoyo_update_domain(&e.head, sizeof(e), param,
+					     tomoyo_same_path_acl,
+					     tomoyo_merge_path_acl);
+	tomoyo_put_name_union(&e.name);
+	return error;
+}
+
+/**
+ * tomoyo_same_mkdev_acl - Check for duplicated "struct tomoyo_mkdev_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b except permission bits, false otherwise.
+ */
+static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a,
+					 const struct tomoyo_acl_info *b)
+{
+	const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), head);
+	const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), head);
+
+	return tomoyo_same_name_union(&p1->name, &p2->name) &&
+		tomoyo_same_number_union(&p1->mode, &p2->mode) &&
+		tomoyo_same_number_union(&p1->major, &p2->major) &&
+		tomoyo_same_number_union(&p1->minor, &p2->minor);
+}
+
+/**
+ * tomoyo_merge_mkdev_acl - Merge duplicated "struct tomoyo_mkdev_acl" entry.
+ *
+ * @a:         Pointer to "struct tomoyo_acl_info".
+ * @b:         Pointer to "struct tomoyo_acl_info".
+ * @is_delete: True for @a &= ~@b, false for @a |= @b.
+ *
+ * Returns true if @a is empty, false otherwise.
+ */
+static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a,
+				   struct tomoyo_acl_info *b,
+				   const bool is_delete)
+{
+	u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl,
+					 head)->perm;
+	u8 perm = READ_ONCE(*a_perm);
+	const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head)
+		->perm;
+
+	if (is_delete)
+		perm &= ~b_perm;
+	else
+		perm |= b_perm;
+	WRITE_ONCE(*a_perm, perm);
+	return !perm;
+}
+
+/**
+ * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list.
+ *
+ * @perm:  Permission.
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_update_mkdev_acl(const u8 perm,
+				   struct tomoyo_acl_param *param)
+{
+	struct tomoyo_mkdev_acl e = {
+		.head.type = TOMOYO_TYPE_MKDEV_ACL,
+		.perm = perm
+	};
+	int error;
+
+	if (!tomoyo_parse_name_union(param, &e.name) ||
+	    !tomoyo_parse_number_union(param, &e.mode) ||
+	    !tomoyo_parse_number_union(param, &e.major) ||
+	    !tomoyo_parse_number_union(param, &e.minor))
+		error = -EINVAL;
+	else
+		error = tomoyo_update_domain(&e.head, sizeof(e), param,
+					     tomoyo_same_mkdev_acl,
+					     tomoyo_merge_mkdev_acl);
+	tomoyo_put_name_union(&e.name);
+	tomoyo_put_number_union(&e.mode);
+	tomoyo_put_number_union(&e.major);
+	tomoyo_put_number_union(&e.minor);
+	return error;
+}
+
+/**
+ * tomoyo_same_path2_acl - Check for duplicated "struct tomoyo_path2_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b except permission bits, false otherwise.
+ */
+static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a,
+				  const struct tomoyo_acl_info *b)
+{
+	const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head);
+	const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head);
+
+	return tomoyo_same_name_union(&p1->name1, &p2->name1) &&
+		tomoyo_same_name_union(&p1->name2, &p2->name2);
+}
+
+/**
+ * tomoyo_merge_path2_acl - Merge duplicated "struct tomoyo_path2_acl" entry.
+ *
+ * @a:         Pointer to "struct tomoyo_acl_info".
+ * @b:         Pointer to "struct tomoyo_acl_info".
+ * @is_delete: True for @a &= ~@b, false for @a |= @b.
+ *
+ * Returns true if @a is empty, false otherwise.
+ */
+static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a,
+				   struct tomoyo_acl_info *b,
+				   const bool is_delete)
+{
+	u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head)
+		->perm;
+	u8 perm = READ_ONCE(*a_perm);
+	const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm;
+
+	if (is_delete)
+		perm &= ~b_perm;
+	else
+		perm |= b_perm;
+	WRITE_ONCE(*a_perm, perm);
+	return !perm;
+}
+
+/**
+ * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list.
+ *
+ * @perm:  Permission.
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_update_path2_acl(const u8 perm,
+				   struct tomoyo_acl_param *param)
+{
+	struct tomoyo_path2_acl e = {
+		.head.type = TOMOYO_TYPE_PATH2_ACL,
+		.perm = perm
+	};
+	int error;
+
+	if (!tomoyo_parse_name_union(param, &e.name1) ||
+	    !tomoyo_parse_name_union(param, &e.name2))
+		error = -EINVAL;
+	else
+		error = tomoyo_update_domain(&e.head, sizeof(e), param,
+					     tomoyo_same_path2_acl,
+					     tomoyo_merge_path2_acl);
+	tomoyo_put_name_union(&e.name1);
+	tomoyo_put_name_union(&e.name2);
+	return error;
+}
+
+/**
+ * tomoyo_path_permission - Check permission for single path operation.
+ *
+ * @r:         Pointer to "struct tomoyo_request_info".
+ * @operation: Type of operation.
+ * @filename:  Filename to check.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
+				  const struct tomoyo_path_info *filename)
+	__must_hold_shared(&tomoyo_ss)
+{
+	int error;
+
+	r->type = tomoyo_p2mac[operation];
+	r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
+	if (r->mode == TOMOYO_CONFIG_DISABLED)
+		return 0;
+	r->param_type = TOMOYO_TYPE_PATH_ACL;
+	r->param.path.filename = filename;
+	r->param.path.operation = operation;
+	do {
+		tomoyo_check_acl(r, tomoyo_check_path_acl);
+		error = tomoyo_audit_path_log(r);
+	} while (error == TOMOYO_RETRY_REQUEST);
+	return error;
+}
+
+/**
+ * tomoyo_execute_permission - Check permission for execute operation.
+ *
+ * @r:         Pointer to "struct tomoyo_request_info".
+ * @filename:  Filename to check.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+int tomoyo_execute_permission(struct tomoyo_request_info *r,
+			      const struct tomoyo_path_info *filename)
+{
+	/*
+	 * Unlike other permission checks, this check is done regardless of
+	 * profile mode settings in order to check for domain transition
+	 * preference.
+	 */
+	r->type = TOMOYO_MAC_FILE_EXECUTE;
+	r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
+	r->param_type = TOMOYO_TYPE_PATH_ACL;
+	r->param.path.filename = filename;
+	r->param.path.operation = TOMOYO_TYPE_EXECUTE;
+	tomoyo_check_acl(r, tomoyo_check_path_acl);
+	r->ee->transition = r->matched_acl && r->matched_acl->cond ?
+		r->matched_acl->cond->transit : NULL;
+	if (r->mode != TOMOYO_CONFIG_DISABLED)
+		return tomoyo_audit_path_log(r);
+	return 0;
+}
+
+/**
+ * tomoyo_same_path_number_acl - Check for duplicated "struct tomoyo_path_number_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b except permission bits, false otherwise.
+ */
+static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a,
+					const struct tomoyo_acl_info *b)
+{
+	const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1),
+							       head);
+	const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2),
+							       head);
+
+	return tomoyo_same_name_union(&p1->name, &p2->name) &&
+		tomoyo_same_number_union(&p1->number, &p2->number);
+}
+
+/**
+ * tomoyo_merge_path_number_acl - Merge duplicated "struct tomoyo_path_number_acl" entry.
+ *
+ * @a:         Pointer to "struct tomoyo_acl_info".
+ * @b:         Pointer to "struct tomoyo_acl_info".
+ * @is_delete: True for @a &= ~@b, false for @a |= @b.
+ *
+ * Returns true if @a is empty, false otherwise.
+ */
+static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a,
+					 struct tomoyo_acl_info *b,
+					 const bool is_delete)
+{
+	u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl,
+					  head)->perm;
+	u8 perm = READ_ONCE(*a_perm);
+	const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head)
+		->perm;
+
+	if (is_delete)
+		perm &= ~b_perm;
+	else
+		perm |= b_perm;
+	WRITE_ONCE(*a_perm, perm);
+	return !perm;
+}
+
+/**
+ * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL.
+ *
+ * @perm:  Permission.
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_update_path_number_acl(const u8 perm,
+					 struct tomoyo_acl_param *param)
+{
+	struct tomoyo_path_number_acl e = {
+		.head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
+		.perm = perm
+	};
+	int error;
+
+	if (!tomoyo_parse_name_union(param, &e.name) ||
+	    !tomoyo_parse_number_union(param, &e.number))
+		error = -EINVAL;
+	else
+		error = tomoyo_update_domain(&e.head, sizeof(e), param,
+					     tomoyo_same_path_number_acl,
+					     tomoyo_merge_path_number_acl);
+	tomoyo_put_name_union(&e.name);
+	tomoyo_put_number_union(&e.number);
+	return error;
+}
+
+/**
+ * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp".
+ *
+ * @type:   Type of operation.
+ * @path:   Pointer to "struct path".
+ * @number: Number.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_path_number_perm(const u8 type, const struct path *path,
+			    unsigned long number)
+{
+	struct tomoyo_request_info r;
+	struct tomoyo_obj_info obj = {
+		.path1 = { .mnt = path->mnt, .dentry = path->dentry },
+	};
+	int error = -ENOMEM;
+	struct tomoyo_path_info buf;
+	int idx;
+
+	if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type])
+	    == TOMOYO_CONFIG_DISABLED)
+		return 0;
+	idx = tomoyo_read_lock();
+	if (!tomoyo_get_realpath(&buf, path))
+		goto out;
+	r.obj = &obj;
+	if (type == TOMOYO_TYPE_MKDIR)
+		tomoyo_add_slash(&buf);
+	r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL;
+	r.param.path_number.operation = type;
+	r.param.path_number.filename = &buf;
+	r.param.path_number.number = number;
+	do {
+		tomoyo_check_acl(&r, tomoyo_check_path_number_acl);
+		error = tomoyo_audit_path_number_log(&r);
+	} while (error == TOMOYO_RETRY_REQUEST);
+	kfree(buf.name);
+ out:
+	tomoyo_read_unlock(idx);
+	if (r.mode != TOMOYO_CONFIG_ENFORCING)
+		error = 0;
+	return error;
+}
+
+/**
+ * tomoyo_check_open_permission - Check permission for "read" and "write".
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @path:   Pointer to "struct path".
+ * @flag:   Flags for open().
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
+				 const struct path *path, const int flag)
+{
+	const u8 acc_mode = ACC_MODE(flag);
+	int error = 0;
+	struct tomoyo_path_info buf;
+	struct tomoyo_request_info r;
+	struct tomoyo_obj_info obj = {
+		.path1 = { .mnt = path->mnt, .dentry = path->dentry },
+	};
+	int idx;
+
+	buf.name = NULL;
+	r.mode = TOMOYO_CONFIG_DISABLED;
+	idx = tomoyo_read_lock();
+	if (acc_mode &&
+	    tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN)
+	    != TOMOYO_CONFIG_DISABLED) {
+		if (!tomoyo_get_realpath(&buf, path)) {
+			error = -ENOMEM;
+			goto out;
+		}
+		r.obj = &obj;
+		if (acc_mode & MAY_READ)
+			error = tomoyo_path_permission(&r, TOMOYO_TYPE_READ,
+						       &buf);
+		if (!error && (acc_mode & MAY_WRITE))
+			error = tomoyo_path_permission(&r, (flag & O_APPEND) ?
+						       TOMOYO_TYPE_APPEND :
+						       TOMOYO_TYPE_WRITE,
+						       &buf);
+	}
+ out:
+	kfree(buf.name);
+	tomoyo_read_unlock(idx);
+	if (r.mode != TOMOYO_CONFIG_ENFORCING)
+		error = 0;
+	return error;
+}
+
+/**
+ * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "append", "chroot" and "unmount".
+ *
+ * @operation: Type of operation.
+ * @path:      Pointer to "struct path".
+ * @target:    Symlink's target if @operation is TOMOYO_TYPE_SYMLINK,
+ *             NULL otherwise.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_path_perm(const u8 operation, const struct path *path, const char *target)
+{
+	struct tomoyo_request_info r;
+	struct tomoyo_obj_info obj = {
+		.path1 = { .mnt = path->mnt, .dentry = path->dentry },
+	};
+	int error;
+	struct tomoyo_path_info buf;
+	bool is_enforce;
+	struct tomoyo_path_info symlink_target;
+	int idx;
+
+	if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
+	    == TOMOYO_CONFIG_DISABLED)
+		return 0;
+	is_enforce = (r.mode == TOMOYO_CONFIG_ENFORCING);
+	error = -ENOMEM;
+	buf.name = NULL;
+	idx = tomoyo_read_lock();
+	if (!tomoyo_get_realpath(&buf, path))
+		goto out;
+	r.obj = &obj;
+	switch (operation) {
+	case TOMOYO_TYPE_RMDIR:
+	case TOMOYO_TYPE_CHROOT:
+		tomoyo_add_slash(&buf);
+		break;
+	case TOMOYO_TYPE_SYMLINK:
+		symlink_target.name = tomoyo_encode(target);
+		if (!symlink_target.name)
+			goto out;
+		tomoyo_fill_path_info(&symlink_target);
+		obj.symlink_target = &symlink_target;
+		break;
+	}
+	error = tomoyo_path_permission(&r, operation, &buf);
+	if (operation == TOMOYO_TYPE_SYMLINK)
+		kfree(symlink_target.name);
+ out:
+	kfree(buf.name);
+	tomoyo_read_unlock(idx);
+	if (!is_enforce)
+		error = 0;
+	return error;
+}
+
+/**
+ * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar".
+ *
+ * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK)
+ * @path:      Pointer to "struct path".
+ * @mode:      Create mode.
+ * @dev:       Device number.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_mkdev_perm(const u8 operation, const struct path *path,
+		      const unsigned int mode, unsigned int dev)
+{
+	struct tomoyo_request_info r;
+	struct tomoyo_obj_info obj = {
+		.path1 = { .mnt = path->mnt, .dentry = path->dentry },
+	};
+	int error = -ENOMEM;
+	struct tomoyo_path_info buf;
+	int idx;
+
+	if (tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation])
+	    == TOMOYO_CONFIG_DISABLED)
+		return 0;
+	idx = tomoyo_read_lock();
+	error = -ENOMEM;
+	if (tomoyo_get_realpath(&buf, path)) {
+		r.obj = &obj;
+		dev = new_decode_dev(dev);
+		r.param_type = TOMOYO_TYPE_MKDEV_ACL;
+		r.param.mkdev.filename = &buf;
+		r.param.mkdev.operation = operation;
+		r.param.mkdev.mode = mode;
+		r.param.mkdev.major = MAJOR(dev);
+		r.param.mkdev.minor = MINOR(dev);
+		tomoyo_check_acl(&r, tomoyo_check_mkdev_acl);
+		error = tomoyo_audit_mkdev_log(&r);
+		kfree(buf.name);
+	}
+	tomoyo_read_unlock(idx);
+	if (r.mode != TOMOYO_CONFIG_ENFORCING)
+		error = 0;
+	return error;
+}
+
+/**
+ * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root".
+ *
+ * @operation: Type of operation.
+ * @path1:      Pointer to "struct path".
+ * @path2:      Pointer to "struct path".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_path2_perm(const u8 operation, const struct path *path1,
+		      const struct path *path2)
+{
+	int error = -ENOMEM;
+	struct tomoyo_path_info buf1;
+	struct tomoyo_path_info buf2;
+	struct tomoyo_request_info r;
+	struct tomoyo_obj_info obj = {
+		.path1 = { .mnt = path1->mnt, .dentry = path1->dentry },
+		.path2 = { .mnt = path2->mnt, .dentry = path2->dentry }
+	};
+	int idx;
+
+	if (tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
+	    == TOMOYO_CONFIG_DISABLED)
+		return 0;
+	buf1.name = NULL;
+	buf2.name = NULL;
+	idx = tomoyo_read_lock();
+	if (!tomoyo_get_realpath(&buf1, path1) ||
+	    !tomoyo_get_realpath(&buf2, path2))
+		goto out;
+	switch (operation) {
+	case TOMOYO_TYPE_RENAME:
+	case TOMOYO_TYPE_LINK:
+		if (!d_is_dir(path1->dentry))
+			break;
+		fallthrough;
+	case TOMOYO_TYPE_PIVOT_ROOT:
+		tomoyo_add_slash(&buf1);
+		tomoyo_add_slash(&buf2);
+		break;
+	}
+	r.obj = &obj;
+	r.param_type = TOMOYO_TYPE_PATH2_ACL;
+	r.param.path2.operation = operation;
+	r.param.path2.filename1 = &buf1;
+	r.param.path2.filename2 = &buf2;
+	do {
+		tomoyo_check_acl(&r, tomoyo_check_path2_acl);
+		error = tomoyo_audit_path2_log(&r);
+	} while (error == TOMOYO_RETRY_REQUEST);
+ out:
+	kfree(buf1.name);
+	kfree(buf2.name);
+	tomoyo_read_unlock(idx);
+	if (r.mode != TOMOYO_CONFIG_ENFORCING)
+		error = 0;
+	return error;
+}
+
+/**
+ * tomoyo_same_mount_acl - Check for duplicated "struct tomoyo_mount_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_mount_acl(const struct tomoyo_acl_info *a,
+				  const struct tomoyo_acl_info *b)
+{
+	const struct tomoyo_mount_acl *p1 = container_of(a, typeof(*p1), head);
+	const struct tomoyo_mount_acl *p2 = container_of(b, typeof(*p2), head);
+
+	return tomoyo_same_name_union(&p1->dev_name, &p2->dev_name) &&
+		tomoyo_same_name_union(&p1->dir_name, &p2->dir_name) &&
+		tomoyo_same_name_union(&p1->fs_type, &p2->fs_type) &&
+		tomoyo_same_number_union(&p1->flags, &p2->flags);
+}
+
+/**
+ * tomoyo_update_mount_acl - Write "struct tomoyo_mount_acl" list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_update_mount_acl(struct tomoyo_acl_param *param)
+{
+	struct tomoyo_mount_acl e = { .head.type = TOMOYO_TYPE_MOUNT_ACL };
+	int error;
+
+	if (!tomoyo_parse_name_union(param, &e.dev_name) ||
+	    !tomoyo_parse_name_union(param, &e.dir_name) ||
+	    !tomoyo_parse_name_union(param, &e.fs_type) ||
+	    !tomoyo_parse_number_union(param, &e.flags))
+		error = -EINVAL;
+	else
+		error = tomoyo_update_domain(&e.head, sizeof(e), param,
+					     tomoyo_same_mount_acl, NULL);
+	tomoyo_put_name_union(&e.dev_name);
+	tomoyo_put_name_union(&e.dir_name);
+	tomoyo_put_name_union(&e.fs_type);
+	tomoyo_put_number_union(&e.flags);
+	return error;
+}
+
+/**
+ * tomoyo_write_file - Update file related list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+int tomoyo_write_file(struct tomoyo_acl_param *param)
+{
+	u16 perm = 0;
+	u8 type;
+	const char *operation = tomoyo_read_token(param);
+
+	for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++)
+		if (tomoyo_permstr(operation, tomoyo_path_keyword[type]))
+			perm |= 1 << type;
+	if (perm)
+		return tomoyo_update_path_acl(perm, param);
+	for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++)
+		if (tomoyo_permstr(operation,
+				   tomoyo_mac_keywords[tomoyo_pp2mac[type]]))
+			perm |= 1 << type;
+	if (perm)
+		return tomoyo_update_path2_acl(perm, param);
+	for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++)
+		if (tomoyo_permstr(operation,
+				   tomoyo_mac_keywords[tomoyo_pn2mac[type]]))
+			perm |= 1 << type;
+	if (perm)
+		return tomoyo_update_path_number_acl(perm, param);
+	for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++)
+		if (tomoyo_permstr(operation,
+				   tomoyo_mac_keywords[tomoyo_pnnn2mac[type]]))
+			perm |= 1 << type;
+	if (perm)
+		return tomoyo_update_mkdev_acl(perm, param);
+	if (tomoyo_permstr(operation,
+			   tomoyo_mac_keywords[TOMOYO_MAC_FILE_MOUNT]))
+		return tomoyo_update_mount_acl(param);
+	return -EINVAL;
+}
diff --git a/security/tomoyo/gc.c b/security/tomoyo/gc.c
new file mode 100644
index 000000000..8e2008863
--- /dev/null
+++ b/security/tomoyo/gc.c
@@ -0,0 +1,682 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/gc.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include "common.h"
+#include <linux/kthread.h>
+#include <linux/slab.h>
+
+/**
+ * tomoyo_memory_free - Free memory for elements.
+ *
+ * @ptr:  Pointer to allocated memory.
+ *
+ * Returns nothing.
+ *
+ * Caller holds tomoyo_policy_lock mutex.
+ */
+static inline void tomoyo_memory_free(void *ptr)
+{
+	tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= ksize(ptr);
+	kfree(ptr);
+}
+/* Lock for protecting tomoyo_io_buffer_list. */
+static DEFINE_SPINLOCK(tomoyo_io_buffer_list_lock);
+/* The list for "struct tomoyo_io_buffer". */
+static __guarded_by(&tomoyo_io_buffer_list_lock) LIST_HEAD(tomoyo_io_buffer_list);
+
+/**
+ * tomoyo_struct_used_by_io_buffer - Check whether the list element is used by /sys/kernel/security/tomoyo/ users or not.
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns true if @element is used by /sys/kernel/security/tomoyo/ users,
+ * false otherwise.
+ */
+static bool tomoyo_struct_used_by_io_buffer(const struct list_head *element)
+{
+	struct tomoyo_io_buffer *head;
+	bool in_use = false;
+
+	spin_lock(&tomoyo_io_buffer_list_lock);
+	list_for_each_entry(head, &tomoyo_io_buffer_list, list) {
+		head->users++;
+		spin_unlock(&tomoyo_io_buffer_list_lock);
+		mutex_lock(&head->io_sem);
+		if (head->r.domain == element || head->r.group == element ||
+		    head->r.acl == element || &head->w.domain->list == element)
+			in_use = true;
+		mutex_unlock(&head->io_sem);
+		spin_lock(&tomoyo_io_buffer_list_lock);
+		head->users--;
+		if (in_use)
+			break;
+	}
+	spin_unlock(&tomoyo_io_buffer_list_lock);
+	return in_use;
+}
+
+/**
+ * tomoyo_name_used_by_io_buffer - Check whether the string is used by /sys/kernel/security/tomoyo/ users or not.
+ *
+ * @string: String to check.
+ *
+ * Returns true if @string is used by /sys/kernel/security/tomoyo/ users,
+ * false otherwise.
+ */
+static bool tomoyo_name_used_by_io_buffer(const char *string)
+{
+	struct tomoyo_io_buffer *head;
+	const size_t size = strlen(string) + 1;
+	bool in_use = false;
+
+	spin_lock(&tomoyo_io_buffer_list_lock);
+	list_for_each_entry(head, &tomoyo_io_buffer_list, list) {
+		int i;
+
+		head->users++;
+		spin_unlock(&tomoyo_io_buffer_list_lock);
+		mutex_lock(&head->io_sem);
+		for (i = 0; i < TOMOYO_MAX_IO_READ_QUEUE; i++) {
+			const char *w = head->r.w[i];
+
+			if (w < string || w > string + size)
+				continue;
+			in_use = true;
+			break;
+		}
+		mutex_unlock(&head->io_sem);
+		spin_lock(&tomoyo_io_buffer_list_lock);
+		head->users--;
+		if (in_use)
+			break;
+	}
+	spin_unlock(&tomoyo_io_buffer_list_lock);
+	return in_use;
+}
+
+/**
+ * tomoyo_del_transition_control - Delete members in "struct tomoyo_transition_control".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_del_transition_control(struct list_head *element)
+{
+	struct tomoyo_transition_control *ptr =
+		container_of(element, typeof(*ptr), head.list);
+
+	tomoyo_put_name(ptr->domainname);
+	tomoyo_put_name(ptr->program);
+}
+
+/**
+ * tomoyo_del_aggregator - Delete members in "struct tomoyo_aggregator".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_del_aggregator(struct list_head *element)
+{
+	struct tomoyo_aggregator *ptr =
+		container_of(element, typeof(*ptr), head.list);
+
+	tomoyo_put_name(ptr->original_name);
+	tomoyo_put_name(ptr->aggregated_name);
+}
+
+/**
+ * tomoyo_del_manager - Delete members in "struct tomoyo_manager".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_del_manager(struct list_head *element)
+{
+	struct tomoyo_manager *ptr =
+		container_of(element, typeof(*ptr), head.list);
+
+	tomoyo_put_name(ptr->manager);
+}
+
+/**
+ * tomoyo_del_acl - Delete members in "struct tomoyo_acl_info".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_del_acl(struct list_head *element)
+{
+	struct tomoyo_acl_info *acl =
+		container_of(element, typeof(*acl), list);
+
+	tomoyo_put_condition(acl->cond);
+	switch (acl->type) {
+	case TOMOYO_TYPE_PATH_ACL:
+		{
+			struct tomoyo_path_acl *entry
+				= container_of(acl, typeof(*entry), head);
+			tomoyo_put_name_union(&entry->name);
+		}
+		break;
+	case TOMOYO_TYPE_PATH2_ACL:
+		{
+			struct tomoyo_path2_acl *entry
+				= container_of(acl, typeof(*entry), head);
+			tomoyo_put_name_union(&entry->name1);
+			tomoyo_put_name_union(&entry->name2);
+		}
+		break;
+	case TOMOYO_TYPE_PATH_NUMBER_ACL:
+		{
+			struct tomoyo_path_number_acl *entry
+				= container_of(acl, typeof(*entry), head);
+			tomoyo_put_name_union(&entry->name);
+			tomoyo_put_number_union(&entry->number);
+		}
+		break;
+	case TOMOYO_TYPE_MKDEV_ACL:
+		{
+			struct tomoyo_mkdev_acl *entry
+				= container_of(acl, typeof(*entry), head);
+			tomoyo_put_name_union(&entry->name);
+			tomoyo_put_number_union(&entry->mode);
+			tomoyo_put_number_union(&entry->major);
+			tomoyo_put_number_union(&entry->minor);
+		}
+		break;
+	case TOMOYO_TYPE_MOUNT_ACL:
+		{
+			struct tomoyo_mount_acl *entry
+				= container_of(acl, typeof(*entry), head);
+			tomoyo_put_name_union(&entry->dev_name);
+			tomoyo_put_name_union(&entry->dir_name);
+			tomoyo_put_name_union(&entry->fs_type);
+			tomoyo_put_number_union(&entry->flags);
+		}
+		break;
+	case TOMOYO_TYPE_ENV_ACL:
+		{
+			struct tomoyo_env_acl *entry =
+				container_of(acl, typeof(*entry), head);
+
+			tomoyo_put_name(entry->env);
+		}
+		break;
+	case TOMOYO_TYPE_INET_ACL:
+		{
+			struct tomoyo_inet_acl *entry =
+				container_of(acl, typeof(*entry), head);
+
+			tomoyo_put_group(entry->address.group);
+			tomoyo_put_number_union(&entry->port);
+		}
+		break;
+	case TOMOYO_TYPE_UNIX_ACL:
+		{
+			struct tomoyo_unix_acl *entry =
+				container_of(acl, typeof(*entry), head);
+
+			tomoyo_put_name_union(&entry->name);
+		}
+		break;
+	case TOMOYO_TYPE_MANUAL_TASK_ACL:
+		{
+			struct tomoyo_task_acl *entry =
+				container_of(acl, typeof(*entry), head);
+
+			tomoyo_put_name(entry->domainname);
+		}
+		break;
+	}
+}
+
+/**
+ * tomoyo_del_domain - Delete members in "struct tomoyo_domain_info".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ *
+ * Caller holds tomoyo_policy_lock mutex.
+ */
+static inline void tomoyo_del_domain(struct list_head *element)
+{
+	struct tomoyo_domain_info *domain =
+		container_of(element, typeof(*domain), list);
+	struct tomoyo_acl_info *acl;
+	struct tomoyo_acl_info *tmp;
+
+	/*
+	 * Since this domain is referenced from neither
+	 * "struct tomoyo_io_buffer" nor "struct cred"->security, we can delete
+	 * elements without checking for is_deleted flag.
+	 */
+	list_for_each_entry_safe(acl, tmp, &domain->acl_info_list, list) {
+		tomoyo_del_acl(&acl->list);
+		tomoyo_memory_free(acl);
+	}
+	tomoyo_put_name(domain->domainname);
+}
+
+/**
+ * tomoyo_del_condition - Delete members in "struct tomoyo_condition".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+void tomoyo_del_condition(struct list_head *element)
+{
+	struct tomoyo_condition *cond = container_of(element, typeof(*cond),
+						     head.list);
+	const u16 condc = cond->condc;
+	const u16 numbers_count = cond->numbers_count;
+	const u16 names_count = cond->names_count;
+	const u16 argc = cond->argc;
+	const u16 envc = cond->envc;
+	unsigned int i;
+	const struct tomoyo_condition_element *condp
+		= (const struct tomoyo_condition_element *) (cond + 1);
+	struct tomoyo_number_union *numbers_p
+		= (struct tomoyo_number_union *) (condp + condc);
+	struct tomoyo_name_union *names_p
+		= (struct tomoyo_name_union *) (numbers_p + numbers_count);
+	const struct tomoyo_argv *argv
+		= (const struct tomoyo_argv *) (names_p + names_count);
+	const struct tomoyo_envp *envp
+		= (const struct tomoyo_envp *) (argv + argc);
+
+	for (i = 0; i < numbers_count; i++)
+		tomoyo_put_number_union(numbers_p++);
+	for (i = 0; i < names_count; i++)
+		tomoyo_put_name_union(names_p++);
+	for (i = 0; i < argc; argv++, i++)
+		tomoyo_put_name(argv->value);
+	for (i = 0; i < envc; envp++, i++) {
+		tomoyo_put_name(envp->name);
+		tomoyo_put_name(envp->value);
+	}
+}
+
+/**
+ * tomoyo_del_name - Delete members in "struct tomoyo_name".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_del_name(struct list_head *element)
+{
+	/* Nothing to do. */
+}
+
+/**
+ * tomoyo_del_path_group - Delete members in "struct tomoyo_path_group".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_del_path_group(struct list_head *element)
+{
+	struct tomoyo_path_group *member =
+		container_of(element, typeof(*member), head.list);
+
+	tomoyo_put_name(member->member_name);
+}
+
+/**
+ * tomoyo_del_group - Delete "struct tomoyo_group".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_del_group(struct list_head *element)
+{
+	struct tomoyo_group *group =
+		container_of(element, typeof(*group), head.list);
+
+	tomoyo_put_name(group->group_name);
+}
+
+/**
+ * tomoyo_del_address_group - Delete members in "struct tomoyo_address_group".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_del_address_group(struct list_head *element)
+{
+	/* Nothing to do. */
+}
+
+/**
+ * tomoyo_del_number_group - Delete members in "struct tomoyo_number_group".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_del_number_group(struct list_head *element)
+{
+	/* Nothing to do. */
+}
+
+/**
+ * tomoyo_try_to_gc - Try to kfree() an entry.
+ *
+ * @type:    One of values in "enum tomoyo_policy_id".
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ *
+ * Caller holds tomoyo_policy_lock mutex.
+ */
+static void tomoyo_try_to_gc(const enum tomoyo_policy_id type,
+			     struct list_head *element)
+	__must_hold(&tomoyo_policy_lock)
+{
+	/*
+	 * __list_del_entry() guarantees that the list element became no longer
+	 * reachable from the list which the element was originally on (e.g.
+	 * tomoyo_domain_list). Also, synchronize_srcu() guarantees that the
+	 * list element became no longer referenced by syscall users.
+	 */
+	__list_del_entry(element);
+	mutex_unlock(&tomoyo_policy_lock);
+	synchronize_srcu(&tomoyo_ss);
+	/*
+	 * However, there are two users which may still be using the list
+	 * element. We need to defer until both users forget this element.
+	 *
+	 * Don't kfree() until "struct tomoyo_io_buffer"->r.{domain,group,acl}
+	 * and "struct tomoyo_io_buffer"->w.domain forget this element.
+	 */
+	if (tomoyo_struct_used_by_io_buffer(element))
+		goto reinject;
+	switch (type) {
+	case TOMOYO_ID_TRANSITION_CONTROL:
+		tomoyo_del_transition_control(element);
+		break;
+	case TOMOYO_ID_MANAGER:
+		tomoyo_del_manager(element);
+		break;
+	case TOMOYO_ID_AGGREGATOR:
+		tomoyo_del_aggregator(element);
+		break;
+	case TOMOYO_ID_GROUP:
+		tomoyo_del_group(element);
+		break;
+	case TOMOYO_ID_PATH_GROUP:
+		tomoyo_del_path_group(element);
+		break;
+	case TOMOYO_ID_ADDRESS_GROUP:
+		tomoyo_del_address_group(element);
+		break;
+	case TOMOYO_ID_NUMBER_GROUP:
+		tomoyo_del_number_group(element);
+		break;
+	case TOMOYO_ID_CONDITION:
+		tomoyo_del_condition(element);
+		break;
+	case TOMOYO_ID_NAME:
+		/*
+		 * Don't kfree() until all "struct tomoyo_io_buffer"->r.w[]
+		 * forget this element.
+		 */
+		if (tomoyo_name_used_by_io_buffer
+		    (container_of(element, typeof(struct tomoyo_name),
+				  head.list)->entry.name))
+			goto reinject;
+		tomoyo_del_name(element);
+		break;
+	case TOMOYO_ID_ACL:
+		tomoyo_del_acl(element);
+		break;
+	case TOMOYO_ID_DOMAIN:
+		/*
+		 * Don't kfree() until all "struct cred"->security forget this
+		 * element.
+		 */
+		if (atomic_read(&container_of
+				(element, typeof(struct tomoyo_domain_info),
+				 list)->users))
+			goto reinject;
+		break;
+	case TOMOYO_MAX_POLICY:
+		break;
+	}
+	mutex_lock(&tomoyo_policy_lock);
+	if (type == TOMOYO_ID_DOMAIN)
+		tomoyo_del_domain(element);
+	tomoyo_memory_free(element);
+	return;
+reinject:
+	/*
+	 * We can safely reinject this element here because
+	 * (1) Appending list elements and removing list elements are protected
+	 *     by tomoyo_policy_lock mutex.
+	 * (2) Only this function removes list elements and this function is
+	 *     exclusively executed by tomoyo_gc_mutex mutex.
+	 * are true.
+	 */
+	mutex_lock(&tomoyo_policy_lock);
+	list_add_rcu(element, element->prev);
+}
+
+/**
+ * tomoyo_collect_member - Delete elements with "struct tomoyo_acl_head".
+ *
+ * @id:          One of values in "enum tomoyo_policy_id".
+ * @member_list: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_collect_member(const enum tomoyo_policy_id id,
+				  struct list_head *member_list)
+	__must_hold(&tomoyo_policy_lock)
+{
+	struct tomoyo_acl_head *member;
+	struct tomoyo_acl_head *tmp;
+
+	list_for_each_entry_safe(member, tmp, member_list, list) {
+		if (!member->is_deleted)
+			continue;
+		member->is_deleted = TOMOYO_GC_IN_PROGRESS;
+		tomoyo_try_to_gc(id, &member->list);
+	}
+}
+
+/**
+ * tomoyo_collect_acl - Delete elements in "struct tomoyo_domain_info".
+ *
+ * @list: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_collect_acl(struct list_head *list)
+	__must_hold(&tomoyo_policy_lock)
+{
+	struct tomoyo_acl_info *acl;
+	struct tomoyo_acl_info *tmp;
+
+	list_for_each_entry_safe(acl, tmp, list, list) {
+		if (!acl->is_deleted)
+			continue;
+		acl->is_deleted = TOMOYO_GC_IN_PROGRESS;
+		tomoyo_try_to_gc(TOMOYO_ID_ACL, &acl->list);
+	}
+}
+
+/**
+ * tomoyo_collect_entry - Try to kfree() deleted elements.
+ *
+ * Returns nothing.
+ */
+static void tomoyo_collect_entry(void)
+{
+	int i;
+	enum tomoyo_policy_id id;
+	struct tomoyo_policy_namespace *ns;
+
+	mutex_lock(&tomoyo_policy_lock);
+	{
+		struct tomoyo_domain_info *domain;
+		struct tomoyo_domain_info *tmp;
+
+		list_for_each_entry_safe(domain, tmp, &tomoyo_domain_list,
+					 list) {
+			tomoyo_collect_acl(&domain->acl_info_list);
+			if (!domain->is_deleted || atomic_read(&domain->users))
+				continue;
+			tomoyo_try_to_gc(TOMOYO_ID_DOMAIN, &domain->list);
+		}
+	}
+	list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
+		for (id = 0; id < TOMOYO_MAX_POLICY; id++)
+			tomoyo_collect_member(id, &ns->policy_list[id]);
+		for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++)
+			tomoyo_collect_acl(&ns->acl_group[i]);
+	}
+	{
+		struct tomoyo_shared_acl_head *ptr;
+		struct tomoyo_shared_acl_head *tmp;
+
+		list_for_each_entry_safe(ptr, tmp, &tomoyo_condition_list,
+					 list) {
+			if (atomic_read(&ptr->users) > 0)
+				continue;
+			atomic_set(&ptr->users, TOMOYO_GC_IN_PROGRESS);
+			tomoyo_try_to_gc(TOMOYO_ID_CONDITION, &ptr->list);
+		}
+	}
+	list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
+		for (i = 0; i < TOMOYO_MAX_GROUP; i++) {
+			struct list_head *list = &ns->group_list[i];
+			struct tomoyo_group *group;
+			struct tomoyo_group *tmp;
+
+			switch (i) {
+			case 0:
+				id = TOMOYO_ID_PATH_GROUP;
+				break;
+			case 1:
+				id = TOMOYO_ID_NUMBER_GROUP;
+				break;
+			default:
+				id = TOMOYO_ID_ADDRESS_GROUP;
+				break;
+			}
+			list_for_each_entry_safe(group, tmp, list, head.list) {
+				tomoyo_collect_member(id, &group->member_list);
+				if (!list_empty(&group->member_list) ||
+				    atomic_read(&group->head.users) > 0)
+					continue;
+				atomic_set(&group->head.users,
+					   TOMOYO_GC_IN_PROGRESS);
+				tomoyo_try_to_gc(TOMOYO_ID_GROUP,
+						 &group->head.list);
+			}
+		}
+	}
+	for (i = 0; i < TOMOYO_MAX_HASH; i++) {
+		struct list_head *list = &tomoyo_name_list[i];
+		struct tomoyo_shared_acl_head *ptr;
+		struct tomoyo_shared_acl_head *tmp;
+
+		list_for_each_entry_safe(ptr, tmp, list, list) {
+			if (atomic_read(&ptr->users) > 0)
+				continue;
+			atomic_set(&ptr->users, TOMOYO_GC_IN_PROGRESS);
+			tomoyo_try_to_gc(TOMOYO_ID_NAME, &ptr->list);
+		}
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+}
+
+/**
+ * tomoyo_gc_thread - Garbage collector thread function.
+ *
+ * @unused: Unused.
+ *
+ * Returns 0.
+ */
+static int tomoyo_gc_thread(void *unused)
+{
+	/* Garbage collector thread is exclusive. */
+	static DEFINE_MUTEX(tomoyo_gc_mutex);
+
+	if (!mutex_trylock(&tomoyo_gc_mutex))
+		goto out;
+	tomoyo_collect_entry();
+	{
+		struct tomoyo_io_buffer *head;
+		struct tomoyo_io_buffer *tmp;
+
+		spin_lock(&tomoyo_io_buffer_list_lock);
+		list_for_each_entry_safe(head, tmp, &tomoyo_io_buffer_list,
+					 list) {
+			if (head->users)
+				continue;
+			list_del(&head->list);
+			/* Safe destruction because no users are left. */
+			context_unsafe(
+				kfree(head->read_buf);
+				kfree(head->write_buf);
+			);
+			kfree(head);
+		}
+		spin_unlock(&tomoyo_io_buffer_list_lock);
+	}
+	mutex_unlock(&tomoyo_gc_mutex);
+out:
+	/* This acts as do_exit(0). */
+	return 0;
+}
+
+/**
+ * tomoyo_notify_gc - Register/unregister /sys/kernel/security/tomoyo/ users.
+ *
+ * @head:        Pointer to "struct tomoyo_io_buffer".
+ * @is_register: True if register, false if unregister.
+ *
+ * Returns nothing.
+ */
+void tomoyo_notify_gc(struct tomoyo_io_buffer *head, const bool is_register)
+{
+	bool is_write = false;
+
+	spin_lock(&tomoyo_io_buffer_list_lock);
+	if (is_register) {
+		head->users = 1;
+		list_add(&head->list, &tomoyo_io_buffer_list);
+	} else {
+		/*
+		 * tomoyo_write_control() can concurrently update write_buf from
+		 * a non-NULL to new non-NULL pointer with io_sem held.
+		 */
+		is_write = data_race(head->write_buf != NULL);
+		if (!--head->users) {
+			list_del(&head->list);
+			/* Safe destruction because no users are left. */
+			context_unsafe(
+				kfree(head->read_buf);
+				kfree(head->write_buf);
+			);
+			kfree(head);
+		}
+	}
+	spin_unlock(&tomoyo_io_buffer_list_lock);
+	if (is_write)
+		kthread_run(tomoyo_gc_thread, NULL, "GC for TOMOYO");
+}
diff --git a/security/tomoyo/group.c b/security/tomoyo/group.c
new file mode 100644
index 000000000..1cecdd797
--- /dev/null
+++ b/security/tomoyo/group.c
@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/group.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include <linux/slab.h>
+#include <linux/rculist.h>
+
+#include "common.h"
+
+/**
+ * tomoyo_same_path_group - Check for duplicated "struct tomoyo_path_group" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_head".
+ * @b: Pointer to "struct tomoyo_acl_head".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
+				   const struct tomoyo_acl_head *b)
+{
+	return container_of(a, struct tomoyo_path_group, head)->member_name ==
+		container_of(b, struct tomoyo_path_group, head)->member_name;
+}
+
+/**
+ * tomoyo_same_number_group - Check for duplicated "struct tomoyo_number_group" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_head".
+ * @b: Pointer to "struct tomoyo_acl_head".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
+				     const struct tomoyo_acl_head *b)
+{
+	return !memcmp(&container_of(a, struct tomoyo_number_group, head)
+		       ->number,
+		       &container_of(b, struct tomoyo_number_group, head)
+		       ->number,
+		       sizeof(container_of(a, struct tomoyo_number_group, head)
+			      ->number));
+}
+
+/**
+ * tomoyo_same_address_group - Check for duplicated "struct tomoyo_address_group" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_head".
+ * @b: Pointer to "struct tomoyo_acl_head".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_address_group(const struct tomoyo_acl_head *a,
+				      const struct tomoyo_acl_head *b)
+{
+	const struct tomoyo_address_group *p1 = container_of(a, typeof(*p1),
+							     head);
+	const struct tomoyo_address_group *p2 = container_of(b, typeof(*p2),
+							     head);
+
+	return tomoyo_same_ipaddr_union(&p1->address, &p2->address);
+}
+
+/**
+ * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ * @type:  Type of this group.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type)
+{
+	struct tomoyo_group *group = tomoyo_get_group(param, type);
+	int error = -EINVAL;
+
+	if (!group)
+		return -ENOMEM;
+	param->list = &group->member_list;
+	if (type == TOMOYO_PATH_GROUP) {
+		struct tomoyo_path_group e = { };
+
+		e.member_name = tomoyo_get_name(tomoyo_read_token(param));
+		if (!e.member_name) {
+			error = -ENOMEM;
+			goto out;
+		}
+		error = tomoyo_update_policy(&e.head, sizeof(e), param,
+					  tomoyo_same_path_group);
+		tomoyo_put_name(e.member_name);
+	} else if (type == TOMOYO_NUMBER_GROUP) {
+		struct tomoyo_number_group e = { };
+
+		if (param->data[0] == '@' ||
+		    !tomoyo_parse_number_union(param, &e.number))
+			goto out;
+		error = tomoyo_update_policy(&e.head, sizeof(e), param,
+					  tomoyo_same_number_group);
+		/*
+		 * tomoyo_put_number_union() is not needed because
+		 * param->data[0] != '@'.
+		 */
+	} else {
+		struct tomoyo_address_group e = { };
+
+		if (param->data[0] == '@' ||
+		    !tomoyo_parse_ipaddr_union(param, &e.address))
+			goto out;
+		error = tomoyo_update_policy(&e.head, sizeof(e), param,
+					     tomoyo_same_address_group);
+	}
+out:
+	tomoyo_put_group(group);
+	return error;
+}
+
+/**
+ * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
+ *
+ * @pathname: The name of pathname.
+ * @group:    Pointer to "struct tomoyo_path_group".
+ *
+ * Returns matched member's pathname if @pathname matches pathnames in @group,
+ * NULL otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+const struct tomoyo_path_info *
+tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
+			  const struct tomoyo_group *group)
+{
+	struct tomoyo_path_group *member;
+
+	list_for_each_entry_rcu(member, &group->member_list, head.list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		if (member->head.is_deleted)
+			continue;
+		if (!tomoyo_path_matches_pattern(pathname, member->member_name))
+			continue;
+		return member->member_name;
+	}
+	return NULL;
+}
+
+/**
+ * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
+ *
+ * @min:   Min number.
+ * @max:   Max number.
+ * @group: Pointer to "struct tomoyo_number_group".
+ *
+ * Returns true if @min and @max partially overlaps @group, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+bool tomoyo_number_matches_group(const unsigned long min,
+				 const unsigned long max,
+				 const struct tomoyo_group *group)
+{
+	struct tomoyo_number_group *member;
+	bool matched = false;
+
+	list_for_each_entry_rcu(member, &group->member_list, head.list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		if (member->head.is_deleted)
+			continue;
+		if (min > member->number.values[1] ||
+		    max < member->number.values[0])
+			continue;
+		matched = true;
+		break;
+	}
+	return matched;
+}
+
+/**
+ * tomoyo_address_matches_group - Check whether the given address matches members of the given address group.
+ *
+ * @is_ipv6: True if @address is an IPv6 address.
+ * @address: An IPv4 or IPv6 address.
+ * @group:   Pointer to "struct tomoyo_address_group".
+ *
+ * Returns true if @address matches addresses in @group group, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+bool tomoyo_address_matches_group(const bool is_ipv6, const __be32 *address,
+				  const struct tomoyo_group *group)
+{
+	struct tomoyo_address_group *member;
+	bool matched = false;
+	const u8 size = is_ipv6 ? 16 : 4;
+
+	list_for_each_entry_rcu(member, &group->member_list, head.list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		if (member->head.is_deleted)
+			continue;
+		if (member->address.is_ipv6 != is_ipv6)
+			continue;
+		if (memcmp(&member->address.ip[0], address, size) > 0 ||
+		    memcmp(address, &member->address.ip[1], size) > 0)
+			continue;
+		matched = true;
+		break;
+	}
+	return matched;
+}
diff --git a/security/tomoyo/load_policy.c b/security/tomoyo/load_policy.c
new file mode 100644
index 000000000..363b65be8
--- /dev/null
+++ b/security/tomoyo/load_policy.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/load_policy.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include "common.h"
+
+#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
+
+/*
+ * Path to the policy loader. (default = CONFIG_SECURITY_TOMOYO_POLICY_LOADER)
+ */
+static const char *tomoyo_loader;
+
+/**
+ * tomoyo_loader_setup - Set policy loader.
+ *
+ * @str: Program to use as a policy loader (e.g. /sbin/tomoyo-init ).
+ *
+ * Returns 0.
+ */
+static int __init tomoyo_loader_setup(char *str)
+{
+	tomoyo_loader = str;
+	return 1;
+}
+
+__setup("TOMOYO_loader=", tomoyo_loader_setup);
+
+/**
+ * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
+ *
+ * Returns true if /sbin/tomoyo-init exists, false otherwise.
+ */
+static bool tomoyo_policy_loader_exists(void)
+{
+	struct path path;
+
+	if (!tomoyo_loader)
+		tomoyo_loader = CONFIG_SECURITY_TOMOYO_POLICY_LOADER;
+	if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
+		pr_info("Not activating Mandatory Access Control as %s does not exist.\n",
+			tomoyo_loader);
+		return false;
+	}
+	path_put(&path);
+	return true;
+}
+
+/*
+ * Path to the trigger. (default = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER)
+ */
+static const char *tomoyo_trigger;
+
+/**
+ * tomoyo_trigger_setup - Set trigger for activation.
+ *
+ * @str: Program to use as an activation trigger (e.g. /sbin/init ).
+ *
+ * Returns 0.
+ */
+static int __init tomoyo_trigger_setup(char *str)
+{
+	tomoyo_trigger = str;
+	return 1;
+}
+
+__setup("TOMOYO_trigger=", tomoyo_trigger_setup);
+
+/**
+ * tomoyo_load_policy - Run external policy loader to load policy.
+ *
+ * @filename: The program about to start.
+ *
+ * This function checks whether @filename is /sbin/init , and if so
+ * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
+ * and then continues invocation of /sbin/init.
+ * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
+ * writes to /sys/kernel/security/tomoyo/ interfaces.
+ *
+ * Returns nothing.
+ */
+void tomoyo_load_policy(const char *filename)
+{
+	static bool done;
+	char *argv[2];
+	char *envp[3];
+
+	if (tomoyo_policy_loaded || done)
+		return;
+	if (!tomoyo_trigger)
+		tomoyo_trigger = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER;
+	if (strcmp(filename, tomoyo_trigger))
+		return;
+	if (!tomoyo_policy_loader_exists())
+		return;
+	done = true;
+	pr_info("Calling %s to load policy. Please wait.\n", tomoyo_loader);
+	argv[0] = (char *) tomoyo_loader;
+	argv[1] = NULL;
+	envp[0] = "HOME=/";
+	envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+	envp[2] = NULL;
+	call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
+	tomoyo_check_profile();
+}
+
+#endif
diff --git a/security/tomoyo/memory.c b/security/tomoyo/memory.c
new file mode 100644
index 000000000..1b570bde7
--- /dev/null
+++ b/security/tomoyo/memory.c
@@ -0,0 +1,207 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/memory.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include <linux/hash.h>
+#include <linux/slab.h>
+#include "common.h"
+
+/**
+ * tomoyo_warn_oom - Print out of memory warning message.
+ *
+ * @function: Function's name.
+ */
+void tomoyo_warn_oom(const char *function)
+{
+	/* Reduce error messages. */
+	static pid_t tomoyo_last_pid;
+	const pid_t pid = current->pid;
+
+	if (tomoyo_last_pid != pid) {
+		pr_warn("ERROR: Out of memory at %s.\n", function);
+		tomoyo_last_pid = pid;
+	}
+	if (!tomoyo_policy_loaded)
+		panic("MAC Initialization failed.\n");
+}
+
+/* Memoy currently used by policy/audit log/query. */
+unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];
+/* Memory quota for "policy"/"audit log"/"query". */
+unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT];
+
+/**
+ * tomoyo_memory_ok - Check memory quota.
+ *
+ * @ptr: Pointer to allocated memory.
+ *
+ * Returns true on success, false otherwise.
+ *
+ * Returns true if @ptr is not NULL and quota not exceeded, false otherwise.
+ *
+ * Caller holds tomoyo_policy_lock mutex.
+ */
+bool tomoyo_memory_ok(void *ptr)
+{
+	if (ptr) {
+		const size_t s = ksize(ptr);
+
+		tomoyo_memory_used[TOMOYO_MEMORY_POLICY] += s;
+		if (!tomoyo_memory_quota[TOMOYO_MEMORY_POLICY] ||
+		    tomoyo_memory_used[TOMOYO_MEMORY_POLICY] <=
+		    tomoyo_memory_quota[TOMOYO_MEMORY_POLICY])
+			return true;
+		tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s;
+	}
+	tomoyo_warn_oom(__func__);
+	return false;
+}
+
+/**
+ * tomoyo_commit_ok - Check memory quota.
+ *
+ * @data:   Data to copy from.
+ * @size:   Size in byte.
+ *
+ * Returns pointer to allocated memory on success, NULL otherwise.
+ * @data is zero-cleared on success.
+ *
+ * Caller holds tomoyo_policy_lock mutex.
+ */
+void *tomoyo_commit_ok(void *data, const unsigned int size)
+{
+	void *ptr = kzalloc(size, GFP_NOFS | __GFP_NOWARN);
+
+	if (tomoyo_memory_ok(ptr)) {
+		memmove(ptr, data, size);
+		memset(data, 0, size);
+		return ptr;
+	}
+	kfree(ptr);
+	return NULL;
+}
+
+/**
+ * tomoyo_get_group - Allocate memory for "struct tomoyo_path_group"/"struct tomoyo_number_group".
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ * @idx:   Index number.
+ *
+ * Returns pointer to "struct tomoyo_group" on success, NULL otherwise.
+ */
+struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param,
+				      const u8 idx)
+{
+	struct tomoyo_group e = { };
+	struct tomoyo_group *group = NULL;
+	struct list_head *list;
+	const char *group_name = tomoyo_read_token(param);
+	bool found = false;
+
+	if (!tomoyo_correct_word(group_name) || idx >= TOMOYO_MAX_GROUP)
+		return NULL;
+	e.group_name = tomoyo_get_name(group_name);
+	if (!e.group_name)
+		return NULL;
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		goto out;
+	list = &param->ns->group_list[idx];
+	list_for_each_entry(group, list, head.list) {
+		if (e.group_name != group->group_name ||
+		    atomic_read(&group->head.users) == TOMOYO_GC_IN_PROGRESS)
+			continue;
+		atomic_inc(&group->head.users);
+		found = true;
+		break;
+	}
+	if (!found) {
+		struct tomoyo_group *entry = tomoyo_commit_ok(&e, sizeof(e));
+
+		if (entry) {
+			INIT_LIST_HEAD(&entry->member_list);
+			atomic_set(&entry->head.users, 1);
+			list_add_tail_rcu(&entry->head.list, list);
+			group = entry;
+			found = true;
+		}
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+out:
+	tomoyo_put_name(e.group_name);
+	return found ? group : NULL;
+}
+
+/*
+ * tomoyo_name_list is used for holding string data used by TOMOYO.
+ * Since same string data is likely used for multiple times (e.g.
+ * "/lib/libc-2.5.so"), TOMOYO shares string data in the form of
+ * "const struct tomoyo_path_info *".
+ */
+struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
+
+/**
+ * tomoyo_get_name - Allocate permanent memory for string data.
+ *
+ * @name: The string to store into the permernent memory.
+ *
+ * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
+ */
+const struct tomoyo_path_info *tomoyo_get_name(const char *name)
+{
+	struct tomoyo_name *ptr;
+	unsigned int hash;
+	int len;
+	struct list_head *head;
+
+	if (!name)
+		return NULL;
+	len = strlen(name) + 1;
+	hash = full_name_hash(NULL, (const unsigned char *) name, len - 1);
+	head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)];
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		return NULL;
+	list_for_each_entry(ptr, head, head.list) {
+		if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name) ||
+		    atomic_read(&ptr->head.users) == TOMOYO_GC_IN_PROGRESS)
+			continue;
+		atomic_inc(&ptr->head.users);
+		goto out;
+	}
+	ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS | __GFP_NOWARN);
+	if (tomoyo_memory_ok(ptr)) {
+		ptr->entry.name = ((char *) ptr) + sizeof(*ptr);
+		memmove((char *) ptr->entry.name, name, len);
+		atomic_set(&ptr->head.users, 1);
+		tomoyo_fill_path_info(&ptr->entry);
+		list_add_tail(&ptr->head.list, head);
+	} else {
+		kfree(ptr);
+		ptr = NULL;
+	}
+out:
+	mutex_unlock(&tomoyo_policy_lock);
+	return ptr ? &ptr->entry : NULL;
+}
+
+/* Initial namespace.*/
+struct tomoyo_policy_namespace tomoyo_kernel_namespace;
+
+/**
+ * tomoyo_mm_init - Initialize mm related code.
+ */
+void __init tomoyo_mm_init(void)
+{
+	int idx;
+
+	for (idx = 0; idx < TOMOYO_MAX_HASH; idx++)
+		INIT_LIST_HEAD(&tomoyo_name_list[idx]);
+	tomoyo_kernel_namespace.name = "<kernel>";
+	tomoyo_init_policy_namespace(&tomoyo_kernel_namespace);
+	tomoyo_kernel_domain.ns = &tomoyo_kernel_namespace;
+	INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list);
+	tomoyo_kernel_domain.domainname = tomoyo_get_name("<kernel>");
+	list_add_tail_rcu(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
+}
diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c
new file mode 100644
index 000000000..322dfd188
--- /dev/null
+++ b/security/tomoyo/mount.c
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/mount.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include <linux/slab.h>
+#include <uapi/linux/mount.h>
+#include "common.h"
+
+/* String table for special mount operations. */
+static const char * const tomoyo_mounts[TOMOYO_MAX_SPECIAL_MOUNT] = {
+	[TOMOYO_MOUNT_BIND]            = "--bind",
+	[TOMOYO_MOUNT_MOVE]            = "--move",
+	[TOMOYO_MOUNT_REMOUNT]         = "--remount",
+	[TOMOYO_MOUNT_MAKE_UNBINDABLE] = "--make-unbindable",
+	[TOMOYO_MOUNT_MAKE_PRIVATE]    = "--make-private",
+	[TOMOYO_MOUNT_MAKE_SLAVE]      = "--make-slave",
+	[TOMOYO_MOUNT_MAKE_SHARED]     = "--make-shared",
+};
+
+/**
+ * tomoyo_audit_mount_log - Audit mount log.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_audit_mount_log(struct tomoyo_request_info *r)
+	__must_hold_shared(&tomoyo_ss)
+{
+	return tomoyo_supervisor(r, "file mount %s %s %s 0x%lX\n",
+				 r->param.mount.dev->name,
+				 r->param.mount.dir->name,
+				 r->param.mount.type->name,
+				 r->param.mount.flags);
+}
+
+/**
+ * tomoyo_check_mount_acl - Check permission for path path path number operation.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
+static bool tomoyo_check_mount_acl(struct tomoyo_request_info *r,
+				   const struct tomoyo_acl_info *ptr)
+{
+	const struct tomoyo_mount_acl *acl =
+		container_of(ptr, typeof(*acl), head);
+
+	return tomoyo_compare_number_union(r->param.mount.flags,
+					   &acl->flags) &&
+		tomoyo_compare_name_union(r->param.mount.type,
+					  &acl->fs_type) &&
+		tomoyo_compare_name_union(r->param.mount.dir,
+					  &acl->dir_name) &&
+		(!r->param.mount.need_dev ||
+		 tomoyo_compare_name_union(r->param.mount.dev,
+					   &acl->dev_name));
+}
+
+/**
+ * tomoyo_mount_acl - Check permission for mount() operation.
+ *
+ * @r:        Pointer to "struct tomoyo_request_info".
+ * @dev_name: Name of device file. Maybe NULL.
+ * @dir:      Pointer to "struct path".
+ * @type:     Name of filesystem type.
+ * @flags:    Mount options.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_mount_acl(struct tomoyo_request_info *r,
+			    const char *dev_name,
+			    const struct path *dir, const char *type,
+			    unsigned long flags)
+	__must_hold_shared(&tomoyo_ss)
+{
+	struct tomoyo_obj_info obj = { };
+	struct path path;
+	struct file_system_type *fstype = NULL;
+	const char *requested_type = NULL;
+	const char *requested_dir_name = NULL;
+	const char *requested_dev_name = NULL;
+	struct tomoyo_path_info rtype;
+	struct tomoyo_path_info rdev;
+	struct tomoyo_path_info rdir;
+	int need_dev = 0;
+	int error = -ENOMEM;
+
+	r->obj = &obj;
+
+	/* Get fstype. */
+	requested_type = tomoyo_encode(type);
+	if (!requested_type)
+		goto out;
+	rtype.name = requested_type;
+	tomoyo_fill_path_info(&rtype);
+
+	/* Get mount point. */
+	obj.path2 = *dir;
+	requested_dir_name = tomoyo_realpath_from_path(dir);
+	if (!requested_dir_name) {
+		error = -ENOMEM;
+		goto out;
+	}
+	rdir.name = requested_dir_name;
+	tomoyo_fill_path_info(&rdir);
+
+	/* Compare fs name. */
+	if (type == tomoyo_mounts[TOMOYO_MOUNT_REMOUNT]) {
+		/* dev_name is ignored. */
+	} else if (type == tomoyo_mounts[TOMOYO_MOUNT_MAKE_UNBINDABLE] ||
+		   type == tomoyo_mounts[TOMOYO_MOUNT_MAKE_PRIVATE] ||
+		   type == tomoyo_mounts[TOMOYO_MOUNT_MAKE_SLAVE] ||
+		   type == tomoyo_mounts[TOMOYO_MOUNT_MAKE_SHARED]) {
+		/* dev_name is ignored. */
+	} else if (type == tomoyo_mounts[TOMOYO_MOUNT_BIND] ||
+		   type == tomoyo_mounts[TOMOYO_MOUNT_MOVE]) {
+		need_dev = -1; /* dev_name is a directory */
+	} else {
+		fstype = get_fs_type(type);
+		if (!fstype) {
+			error = -ENODEV;
+			goto out;
+		}
+		if (fstype->fs_flags & FS_REQUIRES_DEV)
+			/* dev_name is a block device file. */
+			need_dev = 1;
+	}
+	if (need_dev) {
+		/* Get mount point or device file. */
+		if (!dev_name || kern_path(dev_name, LOOKUP_FOLLOW, &path)) {
+			error = -ENOENT;
+			goto out;
+		}
+		obj.path1 = path;
+		requested_dev_name = tomoyo_realpath_from_path(&path);
+		if (!requested_dev_name) {
+			error = -ENOENT;
+			goto out;
+		}
+	} else {
+		/* Map dev_name to "<NULL>" if no dev_name given. */
+		if (!dev_name)
+			dev_name = "<NULL>";
+		requested_dev_name = tomoyo_encode(dev_name);
+		if (!requested_dev_name) {
+			error = -ENOMEM;
+			goto out;
+		}
+	}
+	rdev.name = requested_dev_name;
+	tomoyo_fill_path_info(&rdev);
+	r->param_type = TOMOYO_TYPE_MOUNT_ACL;
+	r->param.mount.need_dev = need_dev;
+	r->param.mount.dev = &rdev;
+	r->param.mount.dir = &rdir;
+	r->param.mount.type = &rtype;
+	r->param.mount.flags = flags;
+	do {
+		tomoyo_check_acl(r, tomoyo_check_mount_acl);
+		error = tomoyo_audit_mount_log(r);
+	} while (error == TOMOYO_RETRY_REQUEST);
+ out:
+	kfree(requested_dev_name);
+	kfree(requested_dir_name);
+	if (fstype)
+		put_filesystem(fstype);
+	kfree(requested_type);
+	/* Drop refcount obtained by kern_path(). */
+	if (obj.path1.dentry)
+		path_put(&obj.path1);
+	return error;
+}
+
+/**
+ * tomoyo_mount_permission - Check permission for mount() operation.
+ *
+ * @dev_name:  Name of device file. Maybe NULL.
+ * @path:      Pointer to "struct path".
+ * @type:      Name of filesystem type. Maybe NULL.
+ * @flags:     Mount options.
+ * @data_page: Optional data. Maybe NULL.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_mount_permission(const char *dev_name, const struct path *path,
+			    const char *type, unsigned long flags,
+			    void *data_page)
+{
+	struct tomoyo_request_info r;
+	int error;
+	int idx;
+
+	if (tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_MOUNT)
+	    == TOMOYO_CONFIG_DISABLED)
+		return 0;
+	if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
+		flags &= ~MS_MGC_MSK;
+	if (flags & MS_REMOUNT) {
+		type = tomoyo_mounts[TOMOYO_MOUNT_REMOUNT];
+		flags &= ~MS_REMOUNT;
+	} else if (flags & MS_BIND) {
+		type = tomoyo_mounts[TOMOYO_MOUNT_BIND];
+		flags &= ~MS_BIND;
+	} else if (flags & MS_SHARED) {
+		if (flags & (MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
+			return -EINVAL;
+		type = tomoyo_mounts[TOMOYO_MOUNT_MAKE_SHARED];
+		flags &= ~MS_SHARED;
+	} else if (flags & MS_PRIVATE) {
+		if (flags & (MS_SHARED | MS_SLAVE | MS_UNBINDABLE))
+			return -EINVAL;
+		type = tomoyo_mounts[TOMOYO_MOUNT_MAKE_PRIVATE];
+		flags &= ~MS_PRIVATE;
+	} else if (flags & MS_SLAVE) {
+		if (flags & (MS_SHARED | MS_PRIVATE | MS_UNBINDABLE))
+			return -EINVAL;
+		type = tomoyo_mounts[TOMOYO_MOUNT_MAKE_SLAVE];
+		flags &= ~MS_SLAVE;
+	} else if (flags & MS_UNBINDABLE) {
+		if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE))
+			return -EINVAL;
+		type = tomoyo_mounts[TOMOYO_MOUNT_MAKE_UNBINDABLE];
+		flags &= ~MS_UNBINDABLE;
+	} else if (flags & MS_MOVE) {
+		type = tomoyo_mounts[TOMOYO_MOUNT_MOVE];
+		flags &= ~MS_MOVE;
+	}
+	if (!type)
+		type = "<NULL>";
+	idx = tomoyo_read_lock();
+	error = tomoyo_mount_acl(&r, dev_name, path, type, flags);
+	tomoyo_read_unlock(idx);
+	return error;
+}
diff --git a/security/tomoyo/network.c b/security/tomoyo/network.c
new file mode 100644
index 000000000..cfc2a019d
--- /dev/null
+++ b/security/tomoyo/network.c
@@ -0,0 +1,780 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/network.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include "common.h"
+#include <linux/slab.h>
+
+/* Structure for holding inet domain socket's address. */
+struct tomoyo_inet_addr_info {
+	__be16 port;           /* In network byte order. */
+	const __be32 *address; /* In network byte order. */
+	bool is_ipv6;
+};
+
+/* Structure for holding unix domain socket's address. */
+struct tomoyo_unix_addr_info {
+	u8 *addr; /* This may not be '\0' terminated string. */
+	unsigned int addr_len;
+};
+
+/* Structure for holding socket address. */
+struct tomoyo_addr_info {
+	u8 protocol;
+	u8 operation;
+	struct tomoyo_inet_addr_info inet;
+	struct tomoyo_unix_addr_info unix0;
+};
+
+/* String table for socket's protocols. */
+const char * const tomoyo_proto_keyword[TOMOYO_SOCK_MAX] = {
+	[SOCK_STREAM]    = "stream",
+	[SOCK_DGRAM]     = "dgram",
+	[SOCK_RAW]       = "raw",
+	[SOCK_SEQPACKET] = "seqpacket",
+	[0] = " ", /* Dummy for avoiding NULL pointer dereference. */
+	[4] = " ", /* Dummy for avoiding NULL pointer dereference. */
+};
+
+/**
+ * tomoyo_parse_ipaddr_union - Parse an IP address.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ * @ptr:   Pointer to "struct tomoyo_ipaddr_union".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_parse_ipaddr_union(struct tomoyo_acl_param *param,
+			       struct tomoyo_ipaddr_union *ptr)
+{
+	u8 * const min = ptr->ip[0].in6_u.u6_addr8;
+	u8 * const max = ptr->ip[1].in6_u.u6_addr8;
+	char *address = tomoyo_read_token(param);
+	const char *end;
+
+	if (!strchr(address, ':') &&
+	    in4_pton(address, -1, min, '-', &end) > 0) {
+		ptr->is_ipv6 = false;
+		if (!*end)
+			ptr->ip[1].s6_addr32[0] = ptr->ip[0].s6_addr32[0];
+		else if (*end++ != '-' ||
+			 in4_pton(end, -1, max, '\0', &end) <= 0 || *end)
+			return false;
+		return true;
+	}
+	if (in6_pton(address, -1, min, '-', &end) > 0) {
+		ptr->is_ipv6 = true;
+		if (!*end)
+			memmove(max, min, sizeof(u16) * 8);
+		else if (*end++ != '-' ||
+			 in6_pton(end, -1, max, '\0', &end) <= 0 || *end)
+			return false;
+		return true;
+	}
+	return false;
+}
+
+/**
+ * tomoyo_print_ipv4 - Print an IPv4 address.
+ *
+ * @buffer:     Buffer to write to.
+ * @buffer_len: Size of @buffer.
+ * @min_ip:     Pointer to __be32.
+ * @max_ip:     Pointer to __be32.
+ *
+ * Returns nothing.
+ */
+static void tomoyo_print_ipv4(char *buffer, const unsigned int buffer_len,
+			      const __be32 *min_ip, const __be32 *max_ip)
+{
+	snprintf(buffer, buffer_len, "%pI4%c%pI4", min_ip,
+		 *min_ip == *max_ip ? '\0' : '-', max_ip);
+}
+
+/**
+ * tomoyo_print_ipv6 - Print an IPv6 address.
+ *
+ * @buffer:     Buffer to write to.
+ * @buffer_len: Size of @buffer.
+ * @min_ip:     Pointer to "struct in6_addr".
+ * @max_ip:     Pointer to "struct in6_addr".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_print_ipv6(char *buffer, const unsigned int buffer_len,
+			      const struct in6_addr *min_ip,
+			      const struct in6_addr *max_ip)
+{
+	snprintf(buffer, buffer_len, "%pI6c%c%pI6c", min_ip,
+		 !memcmp(min_ip, max_ip, 16) ? '\0' : '-', max_ip);
+}
+
+/**
+ * tomoyo_print_ip - Print an IP address.
+ *
+ * @buf:  Buffer to write to.
+ * @size: Size of @buf.
+ * @ptr:  Pointer to "struct ipaddr_union".
+ *
+ * Returns nothing.
+ */
+void tomoyo_print_ip(char *buf, const unsigned int size,
+		     const struct tomoyo_ipaddr_union *ptr)
+{
+	if (ptr->is_ipv6)
+		tomoyo_print_ipv6(buf, size, &ptr->ip[0], &ptr->ip[1]);
+	else
+		tomoyo_print_ipv4(buf, size, &ptr->ip[0].s6_addr32[0],
+				  &ptr->ip[1].s6_addr32[0]);
+}
+
+/*
+ * Mapping table from "enum tomoyo_network_acl_index" to
+ * "enum tomoyo_mac_index" for inet domain socket.
+ */
+static const u8 tomoyo_inet2mac
+[TOMOYO_SOCK_MAX][TOMOYO_MAX_NETWORK_OPERATION] = {
+	[SOCK_STREAM] = {
+		[TOMOYO_NETWORK_BIND]    = TOMOYO_MAC_NETWORK_INET_STREAM_BIND,
+		[TOMOYO_NETWORK_LISTEN]  =
+		TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN,
+		[TOMOYO_NETWORK_CONNECT] =
+		TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT,
+	},
+	[SOCK_DGRAM] = {
+		[TOMOYO_NETWORK_BIND]    = TOMOYO_MAC_NETWORK_INET_DGRAM_BIND,
+		[TOMOYO_NETWORK_SEND]    = TOMOYO_MAC_NETWORK_INET_DGRAM_SEND,
+	},
+	[SOCK_RAW]    = {
+		[TOMOYO_NETWORK_BIND]    = TOMOYO_MAC_NETWORK_INET_RAW_BIND,
+		[TOMOYO_NETWORK_SEND]    = TOMOYO_MAC_NETWORK_INET_RAW_SEND,
+	},
+};
+
+/*
+ * Mapping table from "enum tomoyo_network_acl_index" to
+ * "enum tomoyo_mac_index" for unix domain socket.
+ */
+static const u8 tomoyo_unix2mac
+[TOMOYO_SOCK_MAX][TOMOYO_MAX_NETWORK_OPERATION] = {
+	[SOCK_STREAM] = {
+		[TOMOYO_NETWORK_BIND]    = TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND,
+		[TOMOYO_NETWORK_LISTEN]  =
+		TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN,
+		[TOMOYO_NETWORK_CONNECT] =
+		TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT,
+	},
+	[SOCK_DGRAM] = {
+		[TOMOYO_NETWORK_BIND]    = TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND,
+		[TOMOYO_NETWORK_SEND]    = TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND,
+	},
+	[SOCK_SEQPACKET] = {
+		[TOMOYO_NETWORK_BIND]    =
+		TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND,
+		[TOMOYO_NETWORK_LISTEN]  =
+		TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN,
+		[TOMOYO_NETWORK_CONNECT] =
+		TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT,
+	},
+};
+
+/**
+ * tomoyo_same_inet_acl - Check for duplicated "struct tomoyo_inet_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b except permission bits, false otherwise.
+ */
+static bool tomoyo_same_inet_acl(const struct tomoyo_acl_info *a,
+				 const struct tomoyo_acl_info *b)
+{
+	const struct tomoyo_inet_acl *p1 = container_of(a, typeof(*p1), head);
+	const struct tomoyo_inet_acl *p2 = container_of(b, typeof(*p2), head);
+
+	return p1->protocol == p2->protocol &&
+		tomoyo_same_ipaddr_union(&p1->address, &p2->address) &&
+		tomoyo_same_number_union(&p1->port, &p2->port);
+}
+
+/**
+ * tomoyo_same_unix_acl - Check for duplicated "struct tomoyo_unix_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b except permission bits, false otherwise.
+ */
+static bool tomoyo_same_unix_acl(const struct tomoyo_acl_info *a,
+				 const struct tomoyo_acl_info *b)
+{
+	const struct tomoyo_unix_acl *p1 = container_of(a, typeof(*p1), head);
+	const struct tomoyo_unix_acl *p2 = container_of(b, typeof(*p2), head);
+
+	return p1->protocol == p2->protocol &&
+		tomoyo_same_name_union(&p1->name, &p2->name);
+}
+
+/**
+ * tomoyo_merge_inet_acl - Merge duplicated "struct tomoyo_inet_acl" entry.
+ *
+ * @a:         Pointer to "struct tomoyo_acl_info".
+ * @b:         Pointer to "struct tomoyo_acl_info".
+ * @is_delete: True for @a &= ~@b, false for @a |= @b.
+ *
+ * Returns true if @a is empty, false otherwise.
+ */
+static bool tomoyo_merge_inet_acl(struct tomoyo_acl_info *a,
+				  struct tomoyo_acl_info *b,
+				  const bool is_delete)
+{
+	u8 * const a_perm =
+		&container_of(a, struct tomoyo_inet_acl, head)->perm;
+	u8 perm = READ_ONCE(*a_perm);
+	const u8 b_perm = container_of(b, struct tomoyo_inet_acl, head)->perm;
+
+	if (is_delete)
+		perm &= ~b_perm;
+	else
+		perm |= b_perm;
+	WRITE_ONCE(*a_perm, perm);
+	return !perm;
+}
+
+/**
+ * tomoyo_merge_unix_acl - Merge duplicated "struct tomoyo_unix_acl" entry.
+ *
+ * @a:         Pointer to "struct tomoyo_acl_info".
+ * @b:         Pointer to "struct tomoyo_acl_info".
+ * @is_delete: True for @a &= ~@b, false for @a |= @b.
+ *
+ * Returns true if @a is empty, false otherwise.
+ */
+static bool tomoyo_merge_unix_acl(struct tomoyo_acl_info *a,
+				  struct tomoyo_acl_info *b,
+				  const bool is_delete)
+{
+	u8 * const a_perm =
+		&container_of(a, struct tomoyo_unix_acl, head)->perm;
+	u8 perm = READ_ONCE(*a_perm);
+	const u8 b_perm = container_of(b, struct tomoyo_unix_acl, head)->perm;
+
+	if (is_delete)
+		perm &= ~b_perm;
+	else
+		perm |= b_perm;
+	WRITE_ONCE(*a_perm, perm);
+	return !perm;
+}
+
+/**
+ * tomoyo_write_inet_network - Write "struct tomoyo_inet_acl" list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+int tomoyo_write_inet_network(struct tomoyo_acl_param *param)
+{
+	struct tomoyo_inet_acl e = { .head.type = TOMOYO_TYPE_INET_ACL };
+	int error = -EINVAL;
+	u8 type;
+	const char *protocol = tomoyo_read_token(param);
+	const char *operation = tomoyo_read_token(param);
+
+	for (e.protocol = 0; e.protocol < TOMOYO_SOCK_MAX; e.protocol++)
+		if (!strcmp(protocol, tomoyo_proto_keyword[e.protocol]))
+			break;
+	for (type = 0; type < TOMOYO_MAX_NETWORK_OPERATION; type++)
+		if (tomoyo_permstr(operation, tomoyo_socket_keyword[type]))
+			e.perm |= 1 << type;
+	if (e.protocol == TOMOYO_SOCK_MAX || !e.perm)
+		return -EINVAL;
+	if (param->data[0] == '@') {
+		param->data++;
+		e.address.group =
+			tomoyo_get_group(param, TOMOYO_ADDRESS_GROUP);
+		if (!e.address.group)
+			return -ENOMEM;
+	} else {
+		if (!tomoyo_parse_ipaddr_union(param, &e.address))
+			goto out;
+	}
+	if (!tomoyo_parse_number_union(param, &e.port) ||
+	    e.port.values[1] > 65535)
+		goto out;
+	error = tomoyo_update_domain(&e.head, sizeof(e), param,
+				     tomoyo_same_inet_acl,
+				     tomoyo_merge_inet_acl);
+out:
+	tomoyo_put_group(e.address.group);
+	tomoyo_put_number_union(&e.port);
+	return error;
+}
+
+/**
+ * tomoyo_write_unix_network - Write "struct tomoyo_unix_acl" list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_write_unix_network(struct tomoyo_acl_param *param)
+{
+	struct tomoyo_unix_acl e = { .head.type = TOMOYO_TYPE_UNIX_ACL };
+	int error;
+	u8 type;
+	const char *protocol = tomoyo_read_token(param);
+	const char *operation = tomoyo_read_token(param);
+
+	for (e.protocol = 0; e.protocol < TOMOYO_SOCK_MAX; e.protocol++)
+		if (!strcmp(protocol, tomoyo_proto_keyword[e.protocol]))
+			break;
+	for (type = 0; type < TOMOYO_MAX_NETWORK_OPERATION; type++)
+		if (tomoyo_permstr(operation, tomoyo_socket_keyword[type]))
+			e.perm |= 1 << type;
+	if (e.protocol == TOMOYO_SOCK_MAX || !e.perm)
+		return -EINVAL;
+	if (!tomoyo_parse_name_union(param, &e.name))
+		return -EINVAL;
+	error = tomoyo_update_domain(&e.head, sizeof(e), param,
+				     tomoyo_same_unix_acl,
+				     tomoyo_merge_unix_acl);
+	tomoyo_put_name_union(&e.name);
+	return error;
+}
+
+/**
+ * tomoyo_audit_net_log - Audit network log.
+ *
+ * @r:         Pointer to "struct tomoyo_request_info".
+ * @family:    Name of socket family ("inet" or "unix").
+ * @protocol:  Name of protocol in @family.
+ * @operation: Name of socket operation.
+ * @address:   Name of address.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_audit_net_log(struct tomoyo_request_info *r,
+				const char *family, const u8 protocol,
+				const u8 operation, const char *address)
+	__must_hold_shared(&tomoyo_ss)
+{
+	return tomoyo_supervisor(r, "network %s %s %s %s\n", family,
+				 tomoyo_proto_keyword[protocol],
+				 tomoyo_socket_keyword[operation], address);
+}
+
+/**
+ * tomoyo_audit_inet_log - Audit INET network log.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_audit_inet_log(struct tomoyo_request_info *r)
+	__must_hold_shared(&tomoyo_ss)
+{
+	char buf[128];
+	int len;
+	const __be32 *address = r->param.inet_network.address;
+
+	if (r->param.inet_network.is_ipv6)
+		tomoyo_print_ipv6(buf, sizeof(buf), (const struct in6_addr *)
+				  address, (const struct in6_addr *) address);
+	else
+		tomoyo_print_ipv4(buf, sizeof(buf), address, address);
+	len = strlen(buf);
+	snprintf(buf + len, sizeof(buf) - len, " %u",
+		 r->param.inet_network.port);
+	return tomoyo_audit_net_log(r, "inet", r->param.inet_network.protocol,
+				    r->param.inet_network.operation, buf);
+}
+
+/**
+ * tomoyo_audit_unix_log - Audit UNIX network log.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_audit_unix_log(struct tomoyo_request_info *r)
+	__must_hold_shared(&tomoyo_ss)
+{
+	return tomoyo_audit_net_log(r, "unix", r->param.unix_network.protocol,
+				    r->param.unix_network.operation,
+				    r->param.unix_network.address->name);
+}
+
+/**
+ * tomoyo_check_inet_acl - Check permission for inet domain socket operation.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
+static bool tomoyo_check_inet_acl(struct tomoyo_request_info *r,
+				  const struct tomoyo_acl_info *ptr)
+{
+	const struct tomoyo_inet_acl *acl =
+		container_of(ptr, typeof(*acl), head);
+	const u8 size = r->param.inet_network.is_ipv6 ? 16 : 4;
+
+	if (!(acl->perm & (1 << r->param.inet_network.operation)) ||
+	    !tomoyo_compare_number_union(r->param.inet_network.port,
+					 &acl->port))
+		return false;
+	if (acl->address.group)
+		return tomoyo_address_matches_group
+			(r->param.inet_network.is_ipv6,
+			 r->param.inet_network.address, acl->address.group);
+	return acl->address.is_ipv6 == r->param.inet_network.is_ipv6 &&
+		memcmp(&acl->address.ip[0],
+		       r->param.inet_network.address, size) <= 0 &&
+		memcmp(r->param.inet_network.address,
+		       &acl->address.ip[1], size) <= 0;
+}
+
+/**
+ * tomoyo_check_unix_acl - Check permission for unix domain socket operation.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
+static bool tomoyo_check_unix_acl(struct tomoyo_request_info *r,
+				  const struct tomoyo_acl_info *ptr)
+{
+	const struct tomoyo_unix_acl *acl =
+		container_of(ptr, typeof(*acl), head);
+
+	return (acl->perm & (1 << r->param.unix_network.operation)) &&
+		tomoyo_compare_name_union(r->param.unix_network.address,
+					  &acl->name);
+}
+
+/**
+ * tomoyo_inet_entry - Check permission for INET network operation.
+ *
+ * @address: Pointer to "struct tomoyo_addr_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_inet_entry(const struct tomoyo_addr_info *address)
+{
+	const int idx = tomoyo_read_lock();
+	struct tomoyo_request_info r;
+	int error = 0;
+	const u8 type = tomoyo_inet2mac[address->protocol][address->operation];
+
+	if (type && tomoyo_init_request_info(&r, NULL, type)
+	    != TOMOYO_CONFIG_DISABLED) {
+		r.param_type = TOMOYO_TYPE_INET_ACL;
+		r.param.inet_network.protocol = address->protocol;
+		r.param.inet_network.operation = address->operation;
+		r.param.inet_network.is_ipv6 = address->inet.is_ipv6;
+		r.param.inet_network.address = address->inet.address;
+		r.param.inet_network.port = ntohs(address->inet.port);
+		do {
+			tomoyo_check_acl(&r, tomoyo_check_inet_acl);
+			error = tomoyo_audit_inet_log(&r);
+		} while (error == TOMOYO_RETRY_REQUEST);
+	}
+	tomoyo_read_unlock(idx);
+	return error;
+}
+
+/**
+ * tomoyo_check_inet_address - Check permission for inet domain socket's operation.
+ *
+ * @addr:     Pointer to "struct sockaddr".
+ * @addr_len: Size of @addr.
+ * @port:     Port number.
+ * @address:  Pointer to "struct tomoyo_addr_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_check_inet_address(const struct sockaddr *addr,
+				     const unsigned int addr_len,
+				     const u16 port,
+				     struct tomoyo_addr_info *address)
+{
+	struct tomoyo_inet_addr_info *i = &address->inet;
+
+	if (addr_len < offsetofend(struct sockaddr, sa_family))
+		return 0;
+	switch (addr->sa_family) {
+	case AF_INET6:
+		if (addr_len < SIN6_LEN_RFC2133)
+			goto skip;
+		i->is_ipv6 = true;
+		i->address = (__be32 *)
+			((struct sockaddr_in6 *) addr)->sin6_addr.s6_addr;
+		i->port = ((struct sockaddr_in6 *) addr)->sin6_port;
+		break;
+	case AF_INET:
+		if (addr_len < sizeof(struct sockaddr_in))
+			goto skip;
+		i->is_ipv6 = false;
+		i->address = (__be32 *)
+			&((struct sockaddr_in *) addr)->sin_addr;
+		i->port = ((struct sockaddr_in *) addr)->sin_port;
+		break;
+	default:
+		goto skip;
+	}
+	if (address->protocol == SOCK_RAW)
+		i->port = htons(port);
+	return tomoyo_inet_entry(address);
+skip:
+	return 0;
+}
+
+/**
+ * tomoyo_unix_entry - Check permission for UNIX network operation.
+ *
+ * @address: Pointer to "struct tomoyo_addr_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_unix_entry(const struct tomoyo_addr_info *address)
+{
+	const int idx = tomoyo_read_lock();
+	struct tomoyo_request_info r;
+	int error = 0;
+	const u8 type = tomoyo_unix2mac[address->protocol][address->operation];
+
+	if (type && tomoyo_init_request_info(&r, NULL, type)
+	    != TOMOYO_CONFIG_DISABLED) {
+		char *buf = address->unix0.addr;
+		int len = address->unix0.addr_len - sizeof(sa_family_t);
+
+		if (len <= 0) {
+			buf = "anonymous";
+			len = 9;
+		} else if (buf[0]) {
+			len = strnlen(buf, len);
+		}
+		buf = tomoyo_encode2(buf, len);
+		if (buf) {
+			struct tomoyo_path_info addr;
+
+			addr.name = buf;
+			tomoyo_fill_path_info(&addr);
+			r.param_type = TOMOYO_TYPE_UNIX_ACL;
+			r.param.unix_network.protocol = address->protocol;
+			r.param.unix_network.operation = address->operation;
+			r.param.unix_network.address = &addr;
+			do {
+				tomoyo_check_acl(&r, tomoyo_check_unix_acl);
+				error = tomoyo_audit_unix_log(&r);
+			} while (error == TOMOYO_RETRY_REQUEST);
+			kfree(buf);
+		} else
+			error = -ENOMEM;
+	}
+	tomoyo_read_unlock(idx);
+	return error;
+}
+
+/**
+ * tomoyo_check_unix_address - Check permission for unix domain socket's operation.
+ *
+ * @addr:     Pointer to "struct sockaddr".
+ * @addr_len: Size of @addr.
+ * @address:  Pointer to "struct tomoyo_addr_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_check_unix_address(struct sockaddr *addr,
+				     const unsigned int addr_len,
+				     struct tomoyo_addr_info *address)
+{
+	struct tomoyo_unix_addr_info *u = &address->unix0;
+
+	if (addr_len < offsetofend(struct sockaddr, sa_family))
+		return 0;
+	if (addr->sa_family != AF_UNIX)
+		return 0;
+	u->addr = ((struct sockaddr_un *) addr)->sun_path;
+	u->addr_len = addr_len;
+	return tomoyo_unix_entry(address);
+}
+
+/**
+ * tomoyo_kernel_service - Check whether I'm kernel service or not.
+ *
+ * Returns true if I'm kernel service, false otherwise.
+ */
+static bool tomoyo_kernel_service(void)
+{
+	/* Nothing to do if I am a kernel service. */
+	return current->flags & PF_KTHREAD;
+}
+
+/**
+ * tomoyo_sock_family - Get socket's family.
+ *
+ * @sk: Pointer to "struct sock".
+ *
+ * Returns one of PF_INET, PF_INET6, PF_UNIX or 0.
+ */
+static u8 tomoyo_sock_family(struct sock *sk)
+{
+	u8 family;
+
+	if (tomoyo_kernel_service())
+		return 0;
+	family = sk->sk_family;
+	switch (family) {
+	case PF_INET:
+	case PF_INET6:
+	case PF_UNIX:
+		return family;
+	default:
+		return 0;
+	}
+}
+
+/**
+ * tomoyo_socket_listen_permission - Check permission for listening a socket.
+ *
+ * @sock: Pointer to "struct socket".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_socket_listen_permission(struct socket *sock)
+{
+	struct tomoyo_addr_info address;
+	const u8 family = tomoyo_sock_family(sock->sk);
+	const unsigned int type = sock->type;
+	struct sockaddr_storage addr;
+	int addr_len;
+
+	if (!family || (type != SOCK_STREAM && type != SOCK_SEQPACKET))
+		return 0;
+	{
+		const int error = sock->ops->getname(sock, (struct sockaddr *)
+						     &addr, 0);
+
+		if (error < 0)
+			return error;
+		addr_len = error;
+	}
+	address.protocol = type;
+	address.operation = TOMOYO_NETWORK_LISTEN;
+	if (family == PF_UNIX)
+		return tomoyo_check_unix_address((struct sockaddr *) &addr,
+						 addr_len, &address);
+	return tomoyo_check_inet_address((struct sockaddr *) &addr, addr_len,
+					 0, &address);
+}
+
+/**
+ * tomoyo_socket_connect_permission - Check permission for setting the remote address of a socket.
+ *
+ * @sock:     Pointer to "struct socket".
+ * @addr:     Pointer to "struct sockaddr".
+ * @addr_len: Size of @addr.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_socket_connect_permission(struct socket *sock,
+				     struct sockaddr *addr, int addr_len)
+{
+	struct tomoyo_addr_info address;
+	const u8 family = tomoyo_sock_family(sock->sk);
+	const unsigned int type = sock->type;
+
+	if (!family)
+		return 0;
+	address.protocol = type;
+	switch (type) {
+	case SOCK_DGRAM:
+	case SOCK_RAW:
+		address.operation = TOMOYO_NETWORK_SEND;
+		break;
+	case SOCK_STREAM:
+	case SOCK_SEQPACKET:
+		address.operation = TOMOYO_NETWORK_CONNECT;
+		break;
+	default:
+		return 0;
+	}
+	if (family == PF_UNIX)
+		return tomoyo_check_unix_address(addr, addr_len, &address);
+	return tomoyo_check_inet_address(addr, addr_len, sock->sk->sk_protocol,
+					 &address);
+}
+
+/**
+ * tomoyo_socket_bind_permission - Check permission for setting the local address of a socket.
+ *
+ * @sock:     Pointer to "struct socket".
+ * @addr:     Pointer to "struct sockaddr".
+ * @addr_len: Size of @addr.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_socket_bind_permission(struct socket *sock, struct sockaddr *addr,
+				  int addr_len)
+{
+	struct tomoyo_addr_info address;
+	const u8 family = tomoyo_sock_family(sock->sk);
+	const unsigned int type = sock->type;
+
+	if (!family)
+		return 0;
+	switch (type) {
+	case SOCK_STREAM:
+	case SOCK_DGRAM:
+	case SOCK_RAW:
+	case SOCK_SEQPACKET:
+		address.protocol = type;
+		address.operation = TOMOYO_NETWORK_BIND;
+		break;
+	default:
+		return 0;
+	}
+	if (family == PF_UNIX)
+		return tomoyo_check_unix_address(addr, addr_len, &address);
+	return tomoyo_check_inet_address(addr, addr_len, sock->sk->sk_protocol,
+					 &address);
+}
+
+/**
+ * tomoyo_socket_sendmsg_permission - Check permission for sending a datagram.
+ *
+ * @sock: Pointer to "struct socket".
+ * @msg:  Pointer to "struct msghdr".
+ * @size: Unused.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_socket_sendmsg_permission(struct socket *sock, struct msghdr *msg,
+				     int size)
+{
+	struct tomoyo_addr_info address;
+	const u8 family = tomoyo_sock_family(sock->sk);
+	const unsigned int type = sock->type;
+
+	if (!msg->msg_name || !family ||
+	    (type != SOCK_DGRAM && type != SOCK_RAW))
+		return 0;
+	address.protocol = type;
+	address.operation = TOMOYO_NETWORK_SEND;
+	if (family == PF_UNIX)
+		return tomoyo_check_unix_address((struct sockaddr *)
+						 msg->msg_name,
+						 msg->msg_namelen, &address);
+	return tomoyo_check_inet_address((struct sockaddr *) msg->msg_name,
+					 msg->msg_namelen,
+					 sock->sk->sk_protocol, &address);
+}
diff --git a/security/tomoyo/policy/exception_policy.conf.default b/security/tomoyo/policy/exception_policy.conf.default
new file mode 100644
index 000000000..2678df496
--- /dev/null
+++ b/security/tomoyo/policy/exception_policy.conf.default
@@ -0,0 +1,2 @@
+initialize_domain /sbin/modprobe from any
+initialize_domain /sbin/hotplug from any
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
new file mode 100644
index 000000000..1c483ee7f
--- /dev/null
+++ b/security/tomoyo/realpath.c
@@ -0,0 +1,310 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/realpath.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include "common.h"
+#include <linux/magic.h>
+#include <linux/proc_fs.h>
+
+/**
+ * tomoyo_encode2 - Encode binary string to ascii string.
+ *
+ * @str:     String in binary format.
+ * @str_len: Size of @str in byte.
+ *
+ * Returns pointer to @str in ascii format on success, NULL otherwise.
+ *
+ * This function uses kzalloc(), so caller must kfree() if this function
+ * didn't return NULL.
+ */
+char *tomoyo_encode2(const char *str, int str_len)
+{
+	int i;
+	int len = 0;
+	const char *p = str;
+	char *cp;
+	char *cp0;
+
+	if (!p)
+		return NULL;
+	for (i = 0; i < str_len; i++) {
+		const unsigned char c = p[i];
+
+		if (c == '\\')
+			len += 2;
+		else if (c > ' ' && c < 127)
+			len++;
+		else
+			len += 4;
+	}
+	len++;
+	/* Reserve space for appending "/". */
+	cp = kzalloc(len + 10, GFP_NOFS);
+	if (!cp)
+		return NULL;
+	cp0 = cp;
+	p = str;
+	for (i = 0; i < str_len; i++) {
+		const unsigned char c = p[i];
+
+		if (c == '\\') {
+			*cp++ = '\\';
+			*cp++ = '\\';
+		} else if (c > ' ' && c < 127) {
+			*cp++ = c;
+		} else {
+			*cp++ = '\\';
+			*cp++ = (c >> 6) + '0';
+			*cp++ = ((c >> 3) & 7) + '0';
+			*cp++ = (c & 7) + '0';
+		}
+	}
+	return cp0;
+}
+
+/**
+ * tomoyo_encode - Encode binary string to ascii string.
+ *
+ * @str: String in binary format.
+ *
+ * Returns pointer to @str in ascii format on success, NULL otherwise.
+ *
+ * This function uses kzalloc(), so caller must kfree() if this function
+ * didn't return NULL.
+ */
+char *tomoyo_encode(const char *str)
+{
+	return str ? tomoyo_encode2(str, strlen(str)) : NULL;
+}
+
+/**
+ * tomoyo_get_absolute_path - Get the path of a dentry but ignores chroot'ed root.
+ *
+ * @path:   Pointer to "struct path".
+ * @buffer: Pointer to buffer to return value in.
+ * @buflen: Sizeof @buffer.
+ *
+ * Returns the buffer on success, an error code otherwise.
+ *
+ * If dentry is a directory, trailing '/' is appended.
+ */
+static char *tomoyo_get_absolute_path(const struct path *path, char * const buffer,
+				      const int buflen)
+{
+	char *pos = ERR_PTR(-ENOMEM);
+
+	if (buflen >= 256) {
+		/* go to whatever namespace root we are under */
+		pos = d_absolute_path(path, buffer, buflen - 1);
+		if (!IS_ERR(pos) && *pos == '/' && pos[1]) {
+			struct inode *inode = d_backing_inode(path->dentry);
+
+			if (inode && S_ISDIR(inode->i_mode)) {
+				buffer[buflen - 2] = '/';
+				buffer[buflen - 1] = '\0';
+			}
+		}
+	}
+	return pos;
+}
+
+/**
+ * tomoyo_get_dentry_path - Get the path of a dentry.
+ *
+ * @dentry: Pointer to "struct dentry".
+ * @buffer: Pointer to buffer to return value in.
+ * @buflen: Sizeof @buffer.
+ *
+ * Returns the buffer on success, an error code otherwise.
+ *
+ * If dentry is a directory, trailing '/' is appended.
+ */
+static char *tomoyo_get_dentry_path(struct dentry *dentry, char * const buffer,
+				    const int buflen)
+{
+	char *pos = ERR_PTR(-ENOMEM);
+
+	if (buflen >= 256) {
+		pos = dentry_path_raw(dentry, buffer, buflen - 1);
+		if (!IS_ERR(pos) && *pos == '/' && pos[1]) {
+			struct inode *inode = d_backing_inode(dentry);
+
+			if (inode && S_ISDIR(inode->i_mode)) {
+				buffer[buflen - 2] = '/';
+				buffer[buflen - 1] = '\0';
+			}
+		}
+	}
+	return pos;
+}
+
+/**
+ * tomoyo_get_local_path - Get the path of a dentry.
+ *
+ * @dentry: Pointer to "struct dentry".
+ * @buffer: Pointer to buffer to return value in.
+ * @buflen: Sizeof @buffer.
+ *
+ * Returns the buffer on success, an error code otherwise.
+ */
+static char *tomoyo_get_local_path(struct dentry *dentry, char * const buffer,
+				   const int buflen)
+{
+	struct super_block *sb = dentry->d_sb;
+	char *pos = tomoyo_get_dentry_path(dentry, buffer, buflen);
+
+	if (IS_ERR(pos))
+		return pos;
+	/* Convert from $PID to self if $PID is current thread. */
+	if (sb->s_magic == PROC_SUPER_MAGIC && *pos == '/') {
+		char *ep;
+		const pid_t pid = (pid_t) simple_strtoul(pos + 1, &ep, 10);
+		struct pid_namespace *proc_pidns = proc_pid_ns(sb);
+
+		if (*ep == '/' && pid && pid ==
+		    task_tgid_nr_ns(current, proc_pidns)) {
+			pos = ep - 5;
+			if (pos < buffer)
+				goto out;
+			memmove(pos, "/self", 5);
+		}
+		goto prepend_filesystem_name;
+	}
+	/* Use filesystem name for unnamed devices. */
+	if (!MAJOR(sb->s_dev))
+		goto prepend_filesystem_name;
+	{
+		struct inode *inode = d_backing_inode(sb->s_root);
+
+		/*
+		 * Use filesystem name if filesystem does not support rename()
+		 * operation.
+		 */
+		if (!inode->i_op->rename)
+			goto prepend_filesystem_name;
+	}
+	/* Prepend device name. */
+	{
+		char name[64];
+		int name_len;
+		const dev_t dev = sb->s_dev;
+
+		name[sizeof(name) - 1] = '\0';
+		snprintf(name, sizeof(name) - 1, "dev(%u,%u):", MAJOR(dev),
+			 MINOR(dev));
+		name_len = strlen(name);
+		pos -= name_len;
+		if (pos < buffer)
+			goto out;
+		memmove(pos, name, name_len);
+		return pos;
+	}
+	/* Prepend filesystem name. */
+prepend_filesystem_name:
+	{
+		const char *name = sb->s_type->name;
+		const int name_len = strlen(name);
+
+		pos -= name_len + 1;
+		if (pos < buffer)
+			goto out;
+		memmove(pos, name, name_len);
+		pos[name_len] = ':';
+	}
+	return pos;
+out:
+	return ERR_PTR(-ENOMEM);
+}
+
+/**
+ * tomoyo_realpath_from_path - Returns realpath(3) of the given pathname but ignores chroot'ed root.
+ *
+ * @path: Pointer to "struct path".
+ *
+ * Returns the realpath of the given @path on success, NULL otherwise.
+ *
+ * If dentry is a directory, trailing '/' is appended.
+ * Characters out of 0x20 < c < 0x7F range are converted to
+ * \ooo style octal string.
+ * Character \ is converted to \\ string.
+ *
+ * These functions use kzalloc(), so the caller must call kfree()
+ * if these functions didn't return NULL.
+ */
+char *tomoyo_realpath_from_path(const struct path *path)
+{
+	char *buf = NULL;
+	char *name = NULL;
+	unsigned int buf_len = PAGE_SIZE / 2;
+	struct dentry *dentry = path->dentry;
+	struct super_block *sb = dentry->d_sb;
+
+	while (1) {
+		char *pos;
+		struct inode *inode;
+
+		buf_len <<= 1;
+		kfree(buf);
+		buf = kmalloc(buf_len, GFP_NOFS);
+		if (!buf)
+			break;
+		/* To make sure that pos is '\0' terminated. */
+		buf[buf_len - 1] = '\0';
+		/* For "pipe:[\$]" and "socket:[\$]". */
+		if (dentry->d_op && dentry->d_op->d_dname) {
+			pos = dentry->d_op->d_dname(dentry, buf, buf_len - 1);
+			goto encode;
+		}
+		inode = d_backing_inode(sb->s_root);
+		/*
+		 * Get local name for filesystems without rename() operation
+		 */
+		if ((!inode->i_op->rename &&
+		     !(sb->s_type->fs_flags & FS_REQUIRES_DEV)))
+			pos = tomoyo_get_local_path(path->dentry, buf,
+						    buf_len - 1);
+		/* Get absolute name for the rest. */
+		else {
+			pos = tomoyo_get_absolute_path(path, buf, buf_len - 1);
+			/*
+			 * Fall back to local name if absolute name is not
+			 * available.
+			 */
+			if (pos == ERR_PTR(-EINVAL))
+				pos = tomoyo_get_local_path(path->dentry, buf,
+							    buf_len - 1);
+		}
+encode:
+		if (IS_ERR(pos))
+			continue;
+		name = tomoyo_encode(pos);
+		break;
+	}
+	kfree(buf);
+	if (!name)
+		tomoyo_warn_oom(__func__);
+	return name;
+}
+
+/**
+ * tomoyo_realpath_nofollow - Get realpath of a pathname.
+ *
+ * @pathname: The pathname to solve.
+ *
+ * Returns the realpath of @pathname on success, NULL otherwise.
+ */
+char *tomoyo_realpath_nofollow(const char *pathname)
+{
+	struct path path;
+
+	if (pathname && kern_path(pathname, 0, &path) == 0) {
+		char *buf = tomoyo_realpath_from_path(&path);
+
+		path_put(&path);
+		return buf;
+	}
+	return NULL;
+}
diff --git a/security/tomoyo/securityfs_if.c b/security/tomoyo/securityfs_if.c
new file mode 100644
index 000000000..33933645f
--- /dev/null
+++ b/security/tomoyo/securityfs_if.c
@@ -0,0 +1,271 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/securityfs_if.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include <linux/security.h>
+#include "common.h"
+
+/**
+ * tomoyo_check_task_acl - Check permission for task operation.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
+static bool tomoyo_check_task_acl(struct tomoyo_request_info *r,
+				  const struct tomoyo_acl_info *ptr)
+{
+	const struct tomoyo_task_acl *acl = container_of(ptr, typeof(*acl),
+							 head);
+
+	return !tomoyo_pathcmp(r->param.task.domainname, acl->domainname);
+}
+
+/**
+ * tomoyo_write_self - write() for /sys/kernel/security/tomoyo/self_domain interface.
+ *
+ * @file:  Pointer to "struct file".
+ * @buf:   Domainname to transit to.
+ * @count: Size of @buf.
+ * @ppos:  Unused.
+ *
+ * Returns @count on success, negative value otherwise.
+ *
+ * If domain transition was permitted but the domain transition failed, this
+ * function returns error rather than terminating current thread with SIGKILL.
+ */
+static ssize_t tomoyo_write_self(struct file *file, const char __user *buf,
+			      size_t count, loff_t *ppos)
+{
+	char *data;
+	int error;
+
+	if (!count || count >= TOMOYO_EXEC_TMPSIZE - 10)
+		return -ENOMEM;
+	data = memdup_user_nul(buf, count);
+	if (IS_ERR(data))
+		return PTR_ERR(data);
+	tomoyo_normalize_line(data);
+	if (tomoyo_correct_domain(data)) {
+		const int idx = tomoyo_read_lock();
+		struct tomoyo_path_info name;
+		struct tomoyo_request_info r;
+
+		name.name = data;
+		tomoyo_fill_path_info(&name);
+		/* Check "task manual_domain_transition" permission. */
+		tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE);
+		r.param_type = TOMOYO_TYPE_MANUAL_TASK_ACL;
+		r.param.task.domainname = &name;
+		tomoyo_check_acl(&r, tomoyo_check_task_acl);
+		if (!r.granted)
+			error = -EPERM;
+		else {
+			struct tomoyo_domain_info *new_domain =
+				tomoyo_assign_domain(data, true);
+			if (!new_domain) {
+				error = -ENOENT;
+			} else {
+				struct tomoyo_task *s = tomoyo_task(current);
+				struct tomoyo_domain_info *old_domain =
+					s->domain_info;
+
+				s->domain_info = new_domain;
+				atomic_inc(&new_domain->users);
+				atomic_dec(&old_domain->users);
+				error = 0;
+			}
+		}
+		tomoyo_read_unlock(idx);
+	} else
+		error = -EINVAL;
+	kfree(data);
+	return error ? error : count;
+}
+
+/**
+ * tomoyo_read_self - read() for /sys/kernel/security/tomoyo/self_domain interface.
+ *
+ * @file:  Pointer to "struct file".
+ * @buf:   Domainname which current thread belongs to.
+ * @count: Size of @buf.
+ * @ppos:  Bytes read by now.
+ *
+ * Returns read size on success, negative value otherwise.
+ */
+static ssize_t tomoyo_read_self(struct file *file, char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	const char *domain = tomoyo_domain()->domainname->name;
+	loff_t len = strlen(domain);
+	loff_t pos = *ppos;
+
+	if (pos >= len || !count)
+		return 0;
+	len -= pos;
+	if (count < len)
+		len = count;
+	if (copy_to_user(buf, domain + pos, len))
+		return -EFAULT;
+	*ppos += len;
+	return len;
+}
+
+/* Operations for /sys/kernel/security/tomoyo/self_domain interface. */
+static const struct file_operations tomoyo_self_operations = {
+	.write = tomoyo_write_self,
+	.read  = tomoyo_read_self,
+};
+
+/**
+ * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @inode: Pointer to "struct inode".
+ * @file:  Pointer to "struct file".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_open(struct inode *inode, struct file *file)
+{
+	const u8 key = (uintptr_t) file_inode(file)->i_private;
+
+	return tomoyo_open_control(key, file);
+}
+
+/**
+ * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @inode: Pointer to "struct inode".
+ * @file:  Pointer to "struct file".
+ *
+ */
+static int tomoyo_release(struct inode *inode, struct file *file)
+{
+	tomoyo_close_control(file->private_data);
+	return 0;
+}
+
+/**
+ * tomoyo_poll - poll() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @wait: Pointer to "poll_table". Maybe NULL.
+ *
+ * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
+ * EPOLLOUT | EPOLLWRNORM otherwise.
+ */
+static __poll_t tomoyo_poll(struct file *file, poll_table *wait)
+{
+	return tomoyo_poll_control(file, wait);
+}
+
+/**
+ * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file:  Pointer to "struct file".
+ * @buf:   Pointer to buffer.
+ * @count: Size of @buf.
+ * @ppos:  Unused.
+ *
+ * Returns bytes read on success, negative value otherwise.
+ */
+static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
+			   loff_t *ppos)
+{
+	return tomoyo_read_control(file->private_data, buf, count);
+}
+
+/**
+ * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file:  Pointer to "struct file".
+ * @buf:   Pointer to buffer.
+ * @count: Size of @buf.
+ * @ppos:  Unused.
+ *
+ * Returns @count on success, negative value otherwise.
+ */
+static ssize_t tomoyo_write(struct file *file, const char __user *buf,
+			    size_t count, loff_t *ppos)
+{
+	return tomoyo_write_control(file->private_data, buf, count);
+}
+
+/*
+ * tomoyo_operations is a "struct file_operations" which is used for handling
+ * /sys/kernel/security/tomoyo/ interface.
+ *
+ * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
+ * See tomoyo_io_buffer for internals.
+ */
+static const struct file_operations tomoyo_operations = {
+	.open    = tomoyo_open,
+	.release = tomoyo_release,
+	.poll    = tomoyo_poll,
+	.read    = tomoyo_read,
+	.write   = tomoyo_write,
+	.llseek  = noop_llseek,
+};
+
+/**
+ * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
+ *
+ * @name:   The name of the interface file.
+ * @mode:   The permission of the interface file.
+ * @parent: The parent directory.
+ * @key:    Type of interface.
+ *
+ * Returns nothing.
+ */
+static void __init tomoyo_create_entry(const char *name, const umode_t mode,
+				       struct dentry *parent, const u8 key)
+{
+	securityfs_create_file(name, mode, parent, (void *) (uintptr_t) key,
+			       &tomoyo_operations);
+}
+
+/**
+ * tomoyo_interface_init - Initialize /sys/kernel/security/tomoyo/ interface.
+ *
+ * Returns 0.
+ */
+int __init tomoyo_interface_init(void)
+{
+	struct tomoyo_domain_info *domain;
+	struct dentry *tomoyo_dir;
+
+	if (!tomoyo_enabled)
+		return 0;
+	domain = tomoyo_domain();
+	/* Don't create securityfs entries unless registered. */
+	if (domain != &tomoyo_kernel_domain)
+		return 0;
+
+	tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
+	tomoyo_create_entry("query",            0600, tomoyo_dir,
+			    TOMOYO_QUERY);
+	tomoyo_create_entry("domain_policy",    0600, tomoyo_dir,
+			    TOMOYO_DOMAINPOLICY);
+	tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
+			    TOMOYO_EXCEPTIONPOLICY);
+	tomoyo_create_entry("audit",            0400, tomoyo_dir,
+			    TOMOYO_AUDIT);
+	tomoyo_create_entry(".process_status",  0600, tomoyo_dir,
+			    TOMOYO_PROCESS_STATUS);
+	tomoyo_create_entry("stat",             0644, tomoyo_dir,
+			    TOMOYO_STAT);
+	tomoyo_create_entry("profile",          0600, tomoyo_dir,
+			    TOMOYO_PROFILE);
+	tomoyo_create_entry("manager",          0600, tomoyo_dir,
+			    TOMOYO_MANAGER);
+	tomoyo_create_entry("version",          0400, tomoyo_dir,
+			    TOMOYO_VERSION);
+	securityfs_create_file("self_domain", 0666, tomoyo_dir, NULL,
+			       &tomoyo_self_operations);
+	tomoyo_load_builtin_policy();
+	return 0;
+}
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
new file mode 100644
index 000000000..c66e02ed8
--- /dev/null
+++ b/security/tomoyo/tomoyo.c
@@ -0,0 +1,621 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/tomoyo.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include <linux/lsm_hooks.h>
+#include <uapi/linux/lsm.h>
+#include "common.h"
+
+/**
+ * tomoyo_domain - Get "struct tomoyo_domain_info" for current thread.
+ *
+ * Returns pointer to "struct tomoyo_domain_info" for current thread.
+ */
+struct tomoyo_domain_info *tomoyo_domain(void)
+{
+	struct tomoyo_task *s = tomoyo_task(current);
+
+	if (s->old_domain_info && !current->in_execve) {
+		atomic_dec(&s->old_domain_info->users);
+		s->old_domain_info = NULL;
+	}
+	return s->domain_info;
+}
+
+/**
+ * tomoyo_cred_prepare - Target for security_prepare_creds().
+ *
+ * @new: Pointer to "struct cred".
+ * @old: Pointer to "struct cred".
+ * @gfp: Memory allocation flags.
+ *
+ * Returns 0.
+ */
+static int tomoyo_cred_prepare(struct cred *new, const struct cred *old,
+			       gfp_t gfp)
+{
+	/* Restore old_domain_info saved by previous execve() request. */
+	struct tomoyo_task *s = tomoyo_task(current);
+
+	if (s->old_domain_info && !current->in_execve) {
+		atomic_dec(&s->domain_info->users);
+		s->domain_info = s->old_domain_info;
+		s->old_domain_info = NULL;
+	}
+	return 0;
+}
+
+/**
+ * tomoyo_bprm_committed_creds - Target for security_bprm_committed_creds().
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ */
+static void tomoyo_bprm_committed_creds(const struct linux_binprm *bprm)
+{
+	/* Clear old_domain_info saved by execve() request. */
+	struct tomoyo_task *s = tomoyo_task(current);
+
+	atomic_dec(&s->old_domain_info->users);
+	s->old_domain_info = NULL;
+}
+
+#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
+/**
+ * tomoyo_bprm_creds_for_exec - Target for security_bprm_creds_for_exec().
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ *
+ * Returns 0.
+ */
+static int tomoyo_bprm_creds_for_exec(struct linux_binprm *bprm)
+{
+	/*
+	 * Load policy if /sbin/tomoyo-init exists and /sbin/init is requested
+	 * for the first time.
+	 */
+	if (!tomoyo_policy_loaded)
+		tomoyo_load_policy(bprm->filename);
+	return 0;
+}
+#endif
+
+/**
+ * tomoyo_bprm_check_security - Target for security_bprm_check().
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
+{
+	struct tomoyo_task *s = tomoyo_task(current);
+
+	/*
+	 * Execute permission is checked against pathname passed to execve()
+	 * using current domain.
+	 */
+	if (!s->old_domain_info) {
+		const int idx = tomoyo_read_lock();
+		const int err = tomoyo_find_next_domain(bprm);
+
+		tomoyo_read_unlock(idx);
+		return err;
+	}
+	/*
+	 * Read permission is checked against interpreters using next domain.
+	 */
+	return tomoyo_check_open_permission(s->domain_info,
+					    &bprm->file->f_path, O_RDONLY);
+}
+
+/**
+ * tomoyo_inode_getattr - Target for security_inode_getattr().
+ *
+ * @path: Pointer to "struct path".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_inode_getattr(const struct path *path)
+{
+	return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, path, NULL);
+}
+
+/**
+ * tomoyo_path_truncate - Target for security_path_truncate().
+ *
+ * @path: Pointer to "struct path".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_truncate(const struct path *path)
+{
+	return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL);
+}
+
+/**
+ * tomoyo_file_truncate - Target for security_file_truncate().
+ *
+ * @file: Pointer to "struct file".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_file_truncate(struct file *file)
+{
+	return tomoyo_path_truncate(&file->f_path);
+}
+
+/**
+ * tomoyo_path_unlink - Target for security_path_unlink().
+ *
+ * @parent: Pointer to "struct path".
+ * @dentry: Pointer to "struct dentry".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_unlink(const struct path *parent, struct dentry *dentry)
+{
+	struct path path = { .mnt = parent->mnt, .dentry = dentry };
+
+	return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL);
+}
+
+/**
+ * tomoyo_path_mkdir - Target for security_path_mkdir().
+ *
+ * @parent: Pointer to "struct path".
+ * @dentry: Pointer to "struct dentry".
+ * @mode:   DAC permission mode.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_mkdir(const struct path *parent, struct dentry *dentry,
+			     umode_t mode)
+{
+	struct path path = { .mnt = parent->mnt, .dentry = dentry };
+
+	return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path,
+				       mode & S_IALLUGO);
+}
+
+/**
+ * tomoyo_path_rmdir - Target for security_path_rmdir().
+ *
+ * @parent: Pointer to "struct path".
+ * @dentry: Pointer to "struct dentry".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_rmdir(const struct path *parent, struct dentry *dentry)
+{
+	struct path path = { .mnt = parent->mnt, .dentry = dentry };
+
+	return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL);
+}
+
+/**
+ * tomoyo_path_symlink - Target for security_path_symlink().
+ *
+ * @parent:   Pointer to "struct path".
+ * @dentry:   Pointer to "struct dentry".
+ * @old_name: Symlink's content.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_symlink(const struct path *parent, struct dentry *dentry,
+			       const char *old_name)
+{
+	struct path path = { .mnt = parent->mnt, .dentry = dentry };
+
+	return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name);
+}
+
+/**
+ * tomoyo_path_mknod - Target for security_path_mknod().
+ *
+ * @parent: Pointer to "struct path".
+ * @dentry: Pointer to "struct dentry".
+ * @mode:   DAC permission mode.
+ * @dev:    Device attributes.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_mknod(const struct path *parent, struct dentry *dentry,
+			     umode_t mode, unsigned int dev)
+{
+	struct path path = { .mnt = parent->mnt, .dentry = dentry };
+	int type = TOMOYO_TYPE_CREATE;
+	const unsigned int perm = mode & S_IALLUGO;
+
+	switch (mode & S_IFMT) {
+	case S_IFCHR:
+		type = TOMOYO_TYPE_MKCHAR;
+		break;
+	case S_IFBLK:
+		type = TOMOYO_TYPE_MKBLOCK;
+		break;
+	default:
+		goto no_dev;
+	}
+	return tomoyo_mkdev_perm(type, &path, perm, dev);
+ no_dev:
+	switch (mode & S_IFMT) {
+	case S_IFIFO:
+		type = TOMOYO_TYPE_MKFIFO;
+		break;
+	case S_IFSOCK:
+		type = TOMOYO_TYPE_MKSOCK;
+		break;
+	}
+	return tomoyo_path_number_perm(type, &path, perm);
+}
+
+/**
+ * tomoyo_path_link - Target for security_path_link().
+ *
+ * @old_dentry: Pointer to "struct dentry".
+ * @new_dir:    Pointer to "struct path".
+ * @new_dentry: Pointer to "struct dentry".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_link(struct dentry *old_dentry, const struct path *new_dir,
+			    struct dentry *new_dentry)
+{
+	struct path path1 = { .mnt = new_dir->mnt, .dentry = old_dentry };
+	struct path path2 = { .mnt = new_dir->mnt, .dentry = new_dentry };
+
+	return tomoyo_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2);
+}
+
+/**
+ * tomoyo_path_rename - Target for security_path_rename().
+ *
+ * @old_parent: Pointer to "struct path".
+ * @old_dentry: Pointer to "struct dentry".
+ * @new_parent: Pointer to "struct path".
+ * @new_dentry: Pointer to "struct dentry".
+ * @flags: Rename options.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_rename(const struct path *old_parent,
+			      struct dentry *old_dentry,
+			      const struct path *new_parent,
+			      struct dentry *new_dentry,
+			      const unsigned int flags)
+{
+	struct path path1 = { .mnt = old_parent->mnt, .dentry = old_dentry };
+	struct path path2 = { .mnt = new_parent->mnt, .dentry = new_dentry };
+
+	if (flags & RENAME_EXCHANGE) {
+		const int err = tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path2,
+				&path1);
+
+		if (err)
+			return err;
+	}
+	return tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2);
+}
+
+/**
+ * tomoyo_file_fcntl - Target for security_file_fcntl().
+ *
+ * @file: Pointer to "struct file".
+ * @cmd:  Command for fcntl().
+ * @arg:  Argument for @cmd.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_file_fcntl(struct file *file, unsigned int cmd,
+			     unsigned long arg)
+{
+	if (!(cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND)))
+		return 0;
+	return tomoyo_check_open_permission(tomoyo_domain(), &file->f_path,
+					    O_WRONLY | (arg & O_APPEND));
+}
+
+/**
+ * tomoyo_file_open - Target for security_file_open().
+ *
+ * @f: Pointer to "struct file".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_file_open(struct file *f)
+{
+	/* Don't check read permission here if called from execve(). */
+	/* Illogically, FMODE_EXEC is in f_flags, not f_mode. */
+	if (f->f_flags & __FMODE_EXEC)
+		return 0;
+	return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path,
+					    f->f_flags);
+}
+
+/**
+ * tomoyo_file_ioctl - Target for security_file_ioctl().
+ *
+ * @file: Pointer to "struct file".
+ * @cmd:  Command for ioctl().
+ * @arg:  Argument for @cmd.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_file_ioctl(struct file *file, unsigned int cmd,
+			     unsigned long arg)
+{
+	return tomoyo_path_number_perm(TOMOYO_TYPE_IOCTL, &file->f_path, cmd);
+}
+
+/**
+ * tomoyo_path_chmod - Target for security_path_chmod().
+ *
+ * @path: Pointer to "struct path".
+ * @mode: DAC permission mode.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_chmod(const struct path *path, umode_t mode)
+{
+	return tomoyo_path_number_perm(TOMOYO_TYPE_CHMOD, path,
+				       mode & S_IALLUGO);
+}
+
+/**
+ * tomoyo_path_chown - Target for security_path_chown().
+ *
+ * @path: Pointer to "struct path".
+ * @uid:  Owner ID.
+ * @gid:  Group ID.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
+{
+	int error = 0;
+
+	if (uid_valid(uid))
+		error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path,
+						from_kuid(&init_user_ns, uid));
+	if (!error && gid_valid(gid))
+		error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path,
+						from_kgid(&init_user_ns, gid));
+	return error;
+}
+
+/**
+ * tomoyo_path_chroot - Target for security_path_chroot().
+ *
+ * @path: Pointer to "struct path".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_chroot(const struct path *path)
+{
+	return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL);
+}
+
+/**
+ * tomoyo_sb_mount - Target for security_sb_mount().
+ *
+ * @dev_name: Name of device file. Maybe NULL.
+ * @path:     Pointer to "struct path".
+ * @type:     Name of filesystem type. Maybe NULL.
+ * @flags:    Mount options.
+ * @data:     Optional data. Maybe NULL.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_sb_mount(const char *dev_name, const struct path *path,
+			   const char *type, unsigned long flags, void *data)
+{
+	return tomoyo_mount_permission(dev_name, path, type, flags, data);
+}
+
+/**
+ * tomoyo_sb_umount - Target for security_sb_umount().
+ *
+ * @mnt:   Pointer to "struct vfsmount".
+ * @flags: Unmount options.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
+{
+	struct path path = { .mnt = mnt, .dentry = mnt->mnt_root };
+
+	return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL);
+}
+
+/**
+ * tomoyo_sb_pivotroot - Target for security_sb_pivotroot().
+ *
+ * @old_path: Pointer to "struct path".
+ * @new_path: Pointer to "struct path".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_sb_pivotroot(const struct path *old_path, const struct path *new_path)
+{
+	return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path);
+}
+
+/**
+ * tomoyo_socket_listen - Check permission for listen().
+ *
+ * @sock:    Pointer to "struct socket".
+ * @backlog: Backlog parameter.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_socket_listen(struct socket *sock, int backlog)
+{
+	return tomoyo_socket_listen_permission(sock);
+}
+
+/**
+ * tomoyo_socket_connect - Check permission for connect().
+ *
+ * @sock:     Pointer to "struct socket".
+ * @addr:     Pointer to "struct sockaddr".
+ * @addr_len: Size of @addr.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_socket_connect(struct socket *sock, struct sockaddr *addr,
+				 int addr_len)
+{
+	return tomoyo_socket_connect_permission(sock, addr, addr_len);
+}
+
+/**
+ * tomoyo_socket_bind - Check permission for bind().
+ *
+ * @sock:     Pointer to "struct socket".
+ * @addr:     Pointer to "struct sockaddr".
+ * @addr_len: Size of @addr.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_socket_bind(struct socket *sock, struct sockaddr *addr,
+			      int addr_len)
+{
+	return tomoyo_socket_bind_permission(sock, addr, addr_len);
+}
+
+/**
+ * tomoyo_socket_sendmsg - Check permission for sendmsg().
+ *
+ * @sock: Pointer to "struct socket".
+ * @msg:  Pointer to "struct msghdr".
+ * @size: Size of message.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_socket_sendmsg(struct socket *sock, struct msghdr *msg,
+				 int size)
+{
+	return tomoyo_socket_sendmsg_permission(sock, msg, size);
+}
+
+struct lsm_blob_sizes tomoyo_blob_sizes __ro_after_init = {
+	.lbs_task = sizeof(struct tomoyo_task),
+};
+
+/**
+ * tomoyo_task_alloc - Target for security_task_alloc().
+ *
+ * @task:        Pointer to "struct task_struct".
+ * @clone_flags: clone() flags.
+ *
+ * Returns 0.
+ */
+static int tomoyo_task_alloc(struct task_struct *task,
+			     u64 clone_flags)
+{
+	struct tomoyo_task *old = tomoyo_task(current);
+	struct tomoyo_task *new = tomoyo_task(task);
+
+	new->domain_info = old->domain_info;
+	atomic_inc(&new->domain_info->users);
+	new->old_domain_info = NULL;
+	return 0;
+}
+
+/**
+ * tomoyo_task_free - Target for security_task_free().
+ *
+ * @task: Pointer to "struct task_struct".
+ */
+static void tomoyo_task_free(struct task_struct *task)
+{
+	struct tomoyo_task *s = tomoyo_task(task);
+
+	if (s->domain_info) {
+		atomic_dec(&s->domain_info->users);
+		s->domain_info = NULL;
+	}
+	if (s->old_domain_info) {
+		atomic_dec(&s->old_domain_info->users);
+		s->old_domain_info = NULL;
+	}
+}
+
+static const struct lsm_id tomoyo_lsmid = {
+	.name = "tomoyo",
+	.id = LSM_ID_TOMOYO,
+};
+
+/* tomoyo_hooks is used for registering TOMOYO. */
+static struct security_hook_list tomoyo_hooks[] __ro_after_init = {
+	LSM_HOOK_INIT(cred_prepare, tomoyo_cred_prepare),
+	LSM_HOOK_INIT(bprm_committed_creds, tomoyo_bprm_committed_creds),
+	LSM_HOOK_INIT(task_alloc, tomoyo_task_alloc),
+	LSM_HOOK_INIT(task_free, tomoyo_task_free),
+#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
+	LSM_HOOK_INIT(bprm_creds_for_exec, tomoyo_bprm_creds_for_exec),
+#endif
+	LSM_HOOK_INIT(bprm_check_security, tomoyo_bprm_check_security),
+	LSM_HOOK_INIT(file_fcntl, tomoyo_file_fcntl),
+	LSM_HOOK_INIT(file_open, tomoyo_file_open),
+	LSM_HOOK_INIT(file_truncate, tomoyo_file_truncate),
+	LSM_HOOK_INIT(path_truncate, tomoyo_path_truncate),
+	LSM_HOOK_INIT(path_unlink, tomoyo_path_unlink),
+	LSM_HOOK_INIT(path_mkdir, tomoyo_path_mkdir),
+	LSM_HOOK_INIT(path_rmdir, tomoyo_path_rmdir),
+	LSM_HOOK_INIT(path_symlink, tomoyo_path_symlink),
+	LSM_HOOK_INIT(path_mknod, tomoyo_path_mknod),
+	LSM_HOOK_INIT(path_link, tomoyo_path_link),
+	LSM_HOOK_INIT(path_rename, tomoyo_path_rename),
+	LSM_HOOK_INIT(inode_getattr, tomoyo_inode_getattr),
+	LSM_HOOK_INIT(file_ioctl, tomoyo_file_ioctl),
+	LSM_HOOK_INIT(file_ioctl_compat, tomoyo_file_ioctl),
+	LSM_HOOK_INIT(path_chmod, tomoyo_path_chmod),
+	LSM_HOOK_INIT(path_chown, tomoyo_path_chown),
+	LSM_HOOK_INIT(path_chroot, tomoyo_path_chroot),
+	LSM_HOOK_INIT(sb_mount, tomoyo_sb_mount),
+	LSM_HOOK_INIT(sb_umount, tomoyo_sb_umount),
+	LSM_HOOK_INIT(sb_pivotroot, tomoyo_sb_pivotroot),
+	LSM_HOOK_INIT(socket_bind, tomoyo_socket_bind),
+	LSM_HOOK_INIT(socket_connect, tomoyo_socket_connect),
+	LSM_HOOK_INIT(socket_listen, tomoyo_socket_listen),
+	LSM_HOOK_INIT(socket_sendmsg, tomoyo_socket_sendmsg),
+};
+
+/* Lock for GC. */
+DEFINE_SRCU(tomoyo_ss);
+
+int tomoyo_enabled __ro_after_init = 1;
+
+/**
+ * tomoyo_init - Register TOMOYO Linux as a LSM module.
+ *
+ * Returns 0.
+ */
+static int __init tomoyo_init(void)
+{
+	struct tomoyo_task *s = tomoyo_task(current);
+
+	/* register ourselves with the security framework */
+	security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks),
+			   &tomoyo_lsmid);
+	pr_info("TOMOYO Linux initialized\n");
+	s->domain_info = &tomoyo_kernel_domain;
+	atomic_inc(&tomoyo_kernel_domain.users);
+	s->old_domain_info = NULL;
+	tomoyo_mm_init();
+
+	return 0;
+}
+
+DEFINE_LSM(tomoyo) = {
+	.id = &tomoyo_lsmid,
+	.enabled = &tomoyo_enabled,
+	.flags = LSM_FLAG_LEGACY_MAJOR,
+	.blobs = &tomoyo_blob_sizes,
+	.init = tomoyo_init,
+	.initcall_fs = tomoyo_interface_init,
+};
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
new file mode 100644
index 000000000..6799b1122
--- /dev/null
+++ b/security/tomoyo/util.c
@@ -0,0 +1,1106 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/util.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include <linux/slab.h>
+#include <linux/rculist.h>
+
+#include "common.h"
+
+/* Lock for protecting policy. */
+DEFINE_MUTEX(tomoyo_policy_lock);
+
+/* Has /sbin/init started? */
+bool tomoyo_policy_loaded;
+
+/*
+ * Mapping table from "enum tomoyo_mac_index" to
+ * "enum tomoyo_mac_category_index".
+ */
+const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX] = {
+	/* CONFIG::file group */
+	[TOMOYO_MAC_FILE_EXECUTE]    = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_OPEN]       = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_CREATE]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_UNLINK]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_GETATTR]    = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MKDIR]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_RMDIR]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MKFIFO]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MKSOCK]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_TRUNCATE]   = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_SYMLINK]    = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MKBLOCK]    = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MKCHAR]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_LINK]       = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_RENAME]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_CHMOD]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_CHOWN]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_CHGRP]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_IOCTL]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_CHROOT]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MOUNT]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_UMOUNT]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_PIVOT_ROOT] = TOMOYO_MAC_CATEGORY_FILE,
+	/* CONFIG::network group */
+	[TOMOYO_MAC_NETWORK_INET_STREAM_BIND]       =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN]     =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT]    =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_DGRAM_BIND]        =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_DGRAM_SEND]        =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_RAW_BIND]          =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_RAW_SEND]          =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND]       =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN]     =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT]    =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND]        =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND]        =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND]    =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN]  =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	/* CONFIG::misc group */
+	[TOMOYO_MAC_ENVIRON]         = TOMOYO_MAC_CATEGORY_MISC,
+};
+
+/**
+ * tomoyo_convert_time - Convert time_t to YYYY/MM/DD hh/mm/ss.
+ *
+ * @time64: Seconds since 1970/01/01 00:00:00.
+ * @stamp:  Pointer to "struct tomoyo_time".
+ *
+ * Returns nothing.
+ */
+void tomoyo_convert_time(time64_t time64, struct tomoyo_time *stamp)
+{
+	struct tm tm;
+
+	time64_to_tm(time64, 0, &tm);
+	stamp->sec = tm.tm_sec;
+	stamp->min = tm.tm_min;
+	stamp->hour = tm.tm_hour;
+	stamp->day = tm.tm_mday;
+	stamp->month = tm.tm_mon + 1;
+	stamp->year = tm.tm_year + 1900;
+}
+
+/**
+ * tomoyo_permstr - Find permission keywords.
+ *
+ * @string: String representation for permissions in foo/bar/buz format.
+ * @keyword: Keyword to find from @string/
+ *
+ * Returns true if @keyword was found in @string, false otherwise.
+ *
+ * This function assumes that strncmp(w1, w2, strlen(w1)) != 0 if w1 != w2.
+ */
+bool tomoyo_permstr(const char *string, const char *keyword)
+{
+	const char *cp = strstr(string, keyword);
+
+	if (cp)
+		return cp == string || *(cp - 1) == '/';
+	return false;
+}
+
+/**
+ * tomoyo_read_token - Read a word from a line.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns a word on success, "" otherwise.
+ *
+ * To allow the caller to skip NULL check, this function returns "" rather than
+ * NULL if there is no more words to read.
+ */
+char *tomoyo_read_token(struct tomoyo_acl_param *param)
+{
+	char *pos = param->data;
+	char *del = strchr(pos, ' ');
+
+	if (del)
+		*del++ = '\0';
+	else
+		del = pos + strlen(pos);
+	param->data = del;
+	return pos;
+}
+
+static bool tomoyo_correct_path2(const char *filename, const size_t len);
+
+/**
+ * tomoyo_get_domainname - Read a domainname from a line.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns a domainname on success, NULL otherwise.
+ */
+const struct tomoyo_path_info *tomoyo_get_domainname
+(struct tomoyo_acl_param *param)
+{
+	char *start = param->data;
+	char *pos = start;
+
+	while (*pos) {
+		if (*pos++ != ' ' ||
+		    tomoyo_correct_path2(pos, strchrnul(pos, ' ') - pos))
+			continue;
+		*(pos - 1) = '\0';
+		break;
+	}
+	param->data = pos;
+	if (tomoyo_correct_domain(start))
+		return tomoyo_get_name(start);
+	return NULL;
+}
+
+/**
+ * tomoyo_parse_ulong - Parse an "unsigned long" value.
+ *
+ * @result: Pointer to "unsigned long".
+ * @str:    Pointer to string to parse.
+ *
+ * Returns one of values in "enum tomoyo_value_type".
+ *
+ * The @src is updated to point the first character after the value
+ * on success.
+ */
+u8 tomoyo_parse_ulong(unsigned long *result, char **str)
+{
+	const char *cp = *str;
+	char *ep;
+	int base = 10;
+
+	if (*cp == '0') {
+		char c = *(cp + 1);
+
+		if (c == 'x' || c == 'X') {
+			base = 16;
+			cp += 2;
+		} else if (c >= '0' && c <= '7') {
+			base = 8;
+			cp++;
+		}
+	}
+	*result = simple_strtoul(cp, &ep, base);
+	if (cp == ep)
+		return TOMOYO_VALUE_TYPE_INVALID;
+	*str = ep;
+	switch (base) {
+	case 16:
+		return TOMOYO_VALUE_TYPE_HEXADECIMAL;
+	case 8:
+		return TOMOYO_VALUE_TYPE_OCTAL;
+	default:
+		return TOMOYO_VALUE_TYPE_DECIMAL;
+	}
+}
+
+/**
+ * tomoyo_print_ulong - Print an "unsigned long" value.
+ *
+ * @buffer:     Pointer to buffer.
+ * @buffer_len: Size of @buffer.
+ * @value:      An "unsigned long" value.
+ * @type:       Type of @value.
+ *
+ * Returns nothing.
+ */
+void tomoyo_print_ulong(char *buffer, const int buffer_len,
+			const unsigned long value, const u8 type)
+{
+	if (type == TOMOYO_VALUE_TYPE_DECIMAL)
+		snprintf(buffer, buffer_len, "%lu", value);
+	else if (type == TOMOYO_VALUE_TYPE_OCTAL)
+		snprintf(buffer, buffer_len, "0%lo", value);
+	else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
+		snprintf(buffer, buffer_len, "0x%lX", value);
+	else
+		snprintf(buffer, buffer_len, "type(%u)", type);
+}
+
+/**
+ * tomoyo_parse_name_union - Parse a tomoyo_name_union.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ * @ptr:   Pointer to "struct tomoyo_name_union".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
+			     struct tomoyo_name_union *ptr)
+{
+	char *filename;
+
+	if (param->data[0] == '@') {
+		param->data++;
+		ptr->group = tomoyo_get_group(param, TOMOYO_PATH_GROUP);
+		return ptr->group != NULL;
+	}
+	filename = tomoyo_read_token(param);
+	if (!tomoyo_correct_word(filename))
+		return false;
+	ptr->filename = tomoyo_get_name(filename);
+	return ptr->filename != NULL;
+}
+
+/**
+ * tomoyo_parse_number_union - Parse a tomoyo_number_union.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ * @ptr:   Pointer to "struct tomoyo_number_union".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_parse_number_union(struct tomoyo_acl_param *param,
+			       struct tomoyo_number_union *ptr)
+{
+	char *data;
+	u8 type;
+	unsigned long v;
+
+	memset(ptr, 0, sizeof(*ptr));
+	if (param->data[0] == '@') {
+		param->data++;
+		ptr->group = tomoyo_get_group(param, TOMOYO_NUMBER_GROUP);
+		return ptr->group != NULL;
+	}
+	data = tomoyo_read_token(param);
+	type = tomoyo_parse_ulong(&v, &data);
+	if (type == TOMOYO_VALUE_TYPE_INVALID)
+		return false;
+	ptr->values[0] = v;
+	ptr->value_type[0] = type;
+	if (!*data) {
+		ptr->values[1] = v;
+		ptr->value_type[1] = type;
+		return true;
+	}
+	if (*data++ != '-')
+		return false;
+	type = tomoyo_parse_ulong(&v, &data);
+	if (type == TOMOYO_VALUE_TYPE_INVALID || *data || ptr->values[0] > v)
+		return false;
+	ptr->values[1] = v;
+	ptr->value_type[1] = type;
+	return true;
+}
+
+/**
+ * tomoyo_byte_range - Check whether the string is a \ooo style octal value.
+ *
+ * @str: Pointer to the string.
+ *
+ * Returns true if @str is a \ooo style octal value, false otherwise.
+ *
+ * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
+ * This function verifies that \ooo is in valid range.
+ */
+static inline bool tomoyo_byte_range(const char *str)
+{
+	return *str >= '0' && *str++ <= '3' &&
+		*str >= '0' && *str++ <= '7' &&
+		*str >= '0' && *str <= '7';
+}
+
+/**
+ * tomoyo_alphabet_char - Check whether the character is an alphabet.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is an alphabet character, false otherwise.
+ */
+static inline bool tomoyo_alphabet_char(const char c)
+{
+	return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
+}
+
+/**
+ * tomoyo_make_byte - Make byte value from three octal characters.
+ *
+ * @c1: The first character.
+ * @c2: The second character.
+ * @c3: The third character.
+ *
+ * Returns byte value.
+ */
+static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
+{
+	return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
+}
+
+/**
+ * tomoyo_valid - Check whether the character is a valid char.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is a valid character, false otherwise.
+ */
+static inline bool tomoyo_valid(const unsigned char c)
+{
+	return c > ' ' && c < 127;
+}
+
+/**
+ * tomoyo_invalid - Check whether the character is an invalid char.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is an invalid character, false otherwise.
+ */
+static inline bool tomoyo_invalid(const unsigned char c)
+{
+	return c && (c <= ' ' || c >= 127);
+}
+
+/**
+ * tomoyo_str_starts - Check whether the given string starts with the given keyword.
+ *
+ * @src:  Pointer to pointer to the string.
+ * @find: Pointer to the keyword.
+ *
+ * Returns true if @src starts with @find, false otherwise.
+ *
+ * The @src is updated to point the first character after the @find
+ * if @src starts with @find.
+ */
+bool tomoyo_str_starts(char **src, const char *find)
+{
+	const int len = strlen(find);
+	char *tmp = *src;
+
+	if (strncmp(tmp, find, len))
+		return false;
+	tmp += len;
+	*src = tmp;
+	return true;
+}
+
+/**
+ * tomoyo_normalize_line - Format string.
+ *
+ * @buffer: The line to normalize.
+ *
+ * Leading and trailing whitespaces are removed.
+ * Multiple whitespaces are packed into single space.
+ *
+ * Returns nothing.
+ */
+void tomoyo_normalize_line(unsigned char *buffer)
+{
+	unsigned char *sp = buffer;
+	unsigned char *dp = buffer;
+	bool first = true;
+
+	while (tomoyo_invalid(*sp))
+		sp++;
+	while (*sp) {
+		if (!first)
+			*dp++ = ' ';
+		first = false;
+		while (tomoyo_valid(*sp))
+			*dp++ = *sp++;
+		while (tomoyo_invalid(*sp))
+			sp++;
+	}
+	*dp = '\0';
+}
+
+/**
+ * tomoyo_correct_word2 - Validate a string.
+ *
+ * @string: The string to check. Maybe non-'\0'-terminated.
+ * @len:    Length of @string.
+ *
+ * Check whether the given string follows the naming rules.
+ * Returns true if @string follows the naming rules, false otherwise.
+ */
+static bool tomoyo_correct_word2(const char *string, size_t len)
+{
+	u8 recursion = 20;
+	const char *const start = string;
+	bool in_repetition = false;
+
+	if (!len)
+		goto out;
+	while (len--) {
+		unsigned char c = *string++;
+
+		if (c == '\\') {
+			if (!len--)
+				goto out;
+			c = *string++;
+			if (c >= '0' && c <= '3') {
+				unsigned char d;
+				unsigned char e;
+
+				if (!len-- || !len--)
+					goto out;
+				d = *string++;
+				e = *string++;
+				if (d < '0' || d > '7' || e < '0' || e > '7')
+					goto out;
+				c = tomoyo_make_byte(c, d, e);
+				if (c <= ' ' || c >= 127)
+					continue;
+				goto out;
+			}
+			switch (c) {
+			case '\\':  /* "\\" */
+			case '+':   /* "\+" */
+			case '?':   /* "\?" */
+			case 'x':   /* "\x" */
+			case 'a':   /* "\a" */
+			case '-':   /* "\-" */
+				continue;
+			}
+			if (!recursion--)
+				goto out;
+			switch (c) {
+			case '*':   /* "\*" */
+			case '@':   /* "\@" */
+			case '$':   /* "\$" */
+			case 'X':   /* "\X" */
+			case 'A':   /* "\A" */
+				continue;
+			case '{':   /* "/\{" */
+				if (string - 3 < start || *(string - 3) != '/')
+					goto out;
+				in_repetition = true;
+				continue;
+			case '}':   /* "\}/" */
+				if (*string != '/')
+					goto out;
+				if (!in_repetition)
+					goto out;
+				in_repetition = false;
+				continue;
+			}
+			goto out;
+		} else if (in_repetition && c == '/') {
+			goto out;
+		} else if (c <= ' ' || c >= 127) {
+			goto out;
+		}
+	}
+	if (in_repetition)
+		goto out;
+	return true;
+ out:
+	return false;
+}
+
+/**
+ * tomoyo_correct_word - Validate a string.
+ *
+ * @string: The string to check.
+ *
+ * Check whether the given string follows the naming rules.
+ * Returns true if @string follows the naming rules, false otherwise.
+ */
+bool tomoyo_correct_word(const char *string)
+{
+	return tomoyo_correct_word2(string, strlen(string));
+}
+
+/**
+ * tomoyo_correct_path2 - Check whether the given pathname follows the naming rules.
+ *
+ * @filename: The pathname to check.
+ * @len:      Length of @filename.
+ *
+ * Returns true if @filename follows the naming rules, false otherwise.
+ */
+static bool tomoyo_correct_path2(const char *filename, const size_t len)
+{
+	const char *cp1 = memchr(filename, '/', len);
+	const char *cp2 = memchr(filename, '.', len);
+
+	return cp1 && (!cp2 || (cp1 < cp2)) && tomoyo_correct_word2(filename, len);
+}
+
+/**
+ * tomoyo_correct_path - Validate a pathname.
+ *
+ * @filename: The pathname to check.
+ *
+ * Check whether the given pathname follows the naming rules.
+ * Returns true if @filename follows the naming rules, false otherwise.
+ */
+bool tomoyo_correct_path(const char *filename)
+{
+	return tomoyo_correct_path2(filename, strlen(filename));
+}
+
+/**
+ * tomoyo_correct_domain - Check whether the given domainname follows the naming rules.
+ *
+ * @domainname: The domainname to check.
+ *
+ * Returns true if @domainname follows the naming rules, false otherwise.
+ */
+bool tomoyo_correct_domain(const unsigned char *domainname)
+{
+	if (!domainname || !tomoyo_domain_def(domainname))
+		return false;
+	domainname = strchr(domainname, ' ');
+	if (!domainname++)
+		return true;
+	while (1) {
+		const unsigned char *cp = strchr(domainname, ' ');
+
+		if (!cp)
+			break;
+		if (!tomoyo_correct_path2(domainname, cp - domainname))
+			return false;
+		domainname = cp + 1;
+	}
+	return tomoyo_correct_path(domainname);
+}
+
+/**
+ * tomoyo_domain_def - Check whether the given token can be a domainname.
+ *
+ * @buffer: The token to check.
+ *
+ * Returns true if @buffer possibly be a domainname, false otherwise.
+ */
+bool tomoyo_domain_def(const unsigned char *buffer)
+{
+	const unsigned char *cp;
+	int len;
+
+	if (*buffer != '<')
+		return false;
+	cp = strchr(buffer, ' ');
+	if (!cp)
+		len = strlen(buffer);
+	else
+		len = cp - buffer;
+	if (buffer[len - 1] != '>' ||
+	    !tomoyo_correct_word2(buffer + 1, len - 2))
+		return false;
+	return true;
+}
+
+/**
+ * tomoyo_find_domain - Find a domain by the given name.
+ *
+ * @domainname: The domainname to find.
+ *
+ * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
+{
+	struct tomoyo_domain_info *domain;
+	struct tomoyo_path_info name;
+
+	name.name = domainname;
+	tomoyo_fill_path_info(&name);
+	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		if (!domain->is_deleted &&
+		    !tomoyo_pathcmp(&name, domain->domainname))
+			return domain;
+	}
+	return NULL;
+}
+
+/**
+ * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
+ *
+ * @filename: The string to evaluate.
+ *
+ * Returns the initial length without a pattern in @filename.
+ */
+static int tomoyo_const_part_length(const char *filename)
+{
+	char c;
+	int len = 0;
+
+	if (!filename)
+		return 0;
+	while ((c = *filename++) != '\0') {
+		if (c != '\\') {
+			len++;
+			continue;
+		}
+		c = *filename++;
+		switch (c) {
+		case '\\':  /* "\\" */
+			len += 2;
+			continue;
+		case '0':   /* "\ooo" */
+		case '1':
+		case '2':
+		case '3':
+			c = *filename++;
+			if (c < '0' || c > '7')
+				break;
+			c = *filename++;
+			if (c < '0' || c > '7')
+				break;
+			len += 4;
+			continue;
+		}
+		break;
+	}
+	return len;
+}
+
+/**
+ * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
+ *
+ * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
+ *
+ * The caller sets "struct tomoyo_path_info"->name.
+ */
+void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
+{
+	const char *name = ptr->name;
+	const int len = strlen(name);
+
+	ptr->const_len = tomoyo_const_part_length(name);
+	ptr->is_dir = len && (name[len - 1] == '/');
+	ptr->is_patterned = (ptr->const_len < len);
+	ptr->hash = full_name_hash(NULL, name, len);
+}
+
+/**
+ * tomoyo_file_matches_pattern2 - Pattern matching without '/' character and "\-" pattern.
+ *
+ * @filename:     The start of string to check.
+ * @filename_end: The end of string to check.
+ * @pattern:      The start of pattern to compare.
+ * @pattern_end:  The end of pattern to compare.
+ *
+ * Returns true if @filename matches @pattern, false otherwise.
+ */
+static bool tomoyo_file_matches_pattern2(const char *filename,
+					 const char *filename_end,
+					 const char *pattern,
+					 const char *pattern_end)
+{
+	while (filename < filename_end && pattern < pattern_end) {
+		char c;
+		int i;
+		int j;
+
+		if (*pattern != '\\') {
+			if (*filename++ != *pattern++)
+				return false;
+			continue;
+		}
+		c = *filename;
+		pattern++;
+		switch (*pattern) {
+		case '?':
+			if (c == '/') {
+				return false;
+			} else if (c == '\\') {
+				if (filename[1] == '\\')
+					filename++;
+				else if (tomoyo_byte_range(filename + 1))
+					filename += 3;
+				else
+					return false;
+			}
+			break;
+		case '\\':
+			if (c != '\\')
+				return false;
+			if (*++filename != '\\')
+				return false;
+			break;
+		case '+':
+			if (!isdigit(c))
+				return false;
+			break;
+		case 'x':
+			if (!isxdigit(c))
+				return false;
+			break;
+		case 'a':
+			if (!tomoyo_alphabet_char(c))
+				return false;
+			break;
+		case '0':
+		case '1':
+		case '2':
+		case '3':
+			if (c == '\\' && tomoyo_byte_range(filename + 1)
+			    && strncmp(filename + 1, pattern, 3) == 0) {
+				filename += 3;
+				pattern += 2;
+				break;
+			}
+			return false; /* Not matched. */
+		case '*':
+		case '@':
+			for (i = 0; i <= filename_end - filename; i++) {
+				if (tomoyo_file_matches_pattern2(
+						    filename + i, filename_end,
+						    pattern + 1, pattern_end))
+					return true;
+				c = filename[i];
+				if (c == '.' && *pattern == '@')
+					break;
+				if (c != '\\')
+					continue;
+				if (filename[i + 1] == '\\')
+					i++;
+				else if (tomoyo_byte_range(filename + i + 1))
+					i += 3;
+				else
+					break; /* Bad pattern. */
+			}
+			return false; /* Not matched. */
+		default:
+			j = 0;
+			c = *pattern;
+			if (c == '$') {
+				while (isdigit(filename[j]))
+					j++;
+			} else if (c == 'X') {
+				while (isxdigit(filename[j]))
+					j++;
+			} else if (c == 'A') {
+				while (tomoyo_alphabet_char(filename[j]))
+					j++;
+			}
+			for (i = 1; i <= j; i++) {
+				if (tomoyo_file_matches_pattern2(
+						    filename + i, filename_end,
+						    pattern + 1, pattern_end))
+					return true;
+			}
+			return false; /* Not matched or bad pattern. */
+		}
+		filename++;
+		pattern++;
+	}
+	while (*pattern == '\\' &&
+	       (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
+		pattern += 2;
+	return filename == filename_end && pattern == pattern_end;
+}
+
+/**
+ * tomoyo_file_matches_pattern - Pattern matching without '/' character.
+ *
+ * @filename:     The start of string to check.
+ * @filename_end: The end of string to check.
+ * @pattern:      The start of pattern to compare.
+ * @pattern_end:  The end of pattern to compare.
+ *
+ * Returns true if @filename matches @pattern, false otherwise.
+ */
+static bool tomoyo_file_matches_pattern(const char *filename,
+					const char *filename_end,
+					const char *pattern,
+					const char *pattern_end)
+{
+	const char *pattern_start = pattern;
+	bool first = true;
+	bool result;
+
+	while (pattern < pattern_end - 1) {
+		/* Split at "\-" pattern. */
+		if (*pattern++ != '\\' || *pattern++ != '-')
+			continue;
+		result = tomoyo_file_matches_pattern2(filename,
+						      filename_end,
+						      pattern_start,
+						      pattern - 2);
+		if (first)
+			result = !result;
+		if (result)
+			return false;
+		first = false;
+		pattern_start = pattern;
+	}
+	result = tomoyo_file_matches_pattern2(filename, filename_end,
+					      pattern_start, pattern_end);
+	return first ? result : !result;
+}
+
+/**
+ * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
+ *
+ * @f: The start of string to check.
+ * @p: The start of pattern to compare.
+ *
+ * Returns true if @f matches @p, false otherwise.
+ */
+static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
+{
+	const char *f_delimiter;
+	const char *p_delimiter;
+
+	while (*f && *p) {
+		f_delimiter = strchr(f, '/');
+		if (!f_delimiter)
+			f_delimiter = f + strlen(f);
+		p_delimiter = strchr(p, '/');
+		if (!p_delimiter)
+			p_delimiter = p + strlen(p);
+		if (*p == '\\' && *(p + 1) == '{')
+			goto recursive;
+		if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
+						 p_delimiter))
+			return false;
+		f = f_delimiter;
+		if (*f)
+			f++;
+		p = p_delimiter;
+		if (*p)
+			p++;
+	}
+	/* Ignore trailing "\*" and "\@" in @pattern. */
+	while (*p == '\\' &&
+	       (*(p + 1) == '*' || *(p + 1) == '@'))
+		p += 2;
+	return !*f && !*p;
+ recursive:
+	/*
+	 * The "\{" pattern is permitted only after '/' character.
+	 * This guarantees that below "*(p - 1)" is safe.
+	 * Also, the "\}" pattern is permitted only before '/' character
+	 * so that "\{" + "\}" pair will not break the "\-" operator.
+	 */
+	if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
+	    *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
+		return false; /* Bad pattern. */
+	do {
+		/* Compare current component with pattern. */
+		if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
+						 p_delimiter - 2))
+			break;
+		/* Proceed to next component. */
+		f = f_delimiter;
+		if (!*f)
+			break;
+		f++;
+		/* Continue comparison. */
+		if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
+			return true;
+		f_delimiter = strchr(f, '/');
+	} while (f_delimiter);
+	return false; /* Not matched. */
+}
+
+/**
+ * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
+ *
+ * @filename: The filename to check.
+ * @pattern:  The pattern to compare.
+ *
+ * Returns true if matches, false otherwise.
+ *
+ * The following patterns are available.
+ *   \\     \ itself.
+ *   \ooo   Octal representation of a byte.
+ *   \*     Zero or more repetitions of characters other than '/'.
+ *   \@     Zero or more repetitions of characters other than '/' or '.'.
+ *   \?     1 byte character other than '/'.
+ *   \$     One or more repetitions of decimal digits.
+ *   \+     1 decimal digit.
+ *   \X     One or more repetitions of hexadecimal digits.
+ *   \x     1 hexadecimal digit.
+ *   \A     One or more repetitions of alphabet characters.
+ *   \a     1 alphabet character.
+ *
+ *   \-     Subtraction operator.
+ *
+ *   /\{dir\}/   '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
+ *               /dir/dir/dir/ ).
+ */
+bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
+				 const struct tomoyo_path_info *pattern)
+{
+	const char *f = filename->name;
+	const char *p = pattern->name;
+	const int len = pattern->const_len;
+
+	/* If @pattern doesn't contain pattern, I can use strcmp(). */
+	if (!pattern->is_patterned)
+		return !tomoyo_pathcmp(filename, pattern);
+	/* Don't compare directory and non-directory. */
+	if (filename->is_dir != pattern->is_dir)
+		return false;
+	/* Compare the initial length without patterns. */
+	if (strncmp(f, p, len))
+		return false;
+	f += len;
+	p += len;
+	return tomoyo_path_matches_pattern2(f, p);
+}
+
+/**
+ * tomoyo_get_exe - Get tomoyo_realpath() of current process.
+ *
+ * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
+ *
+ * This function uses kzalloc(), so the caller must call kfree()
+ * if this function didn't return NULL.
+ */
+const char *tomoyo_get_exe(void)
+{
+	struct file *exe_file;
+	const char *cp;
+	struct mm_struct *mm = current->mm;
+
+	if (!mm)
+		return NULL;
+	exe_file = get_mm_exe_file(mm);
+	if (!exe_file)
+		return NULL;
+
+	cp = tomoyo_realpath_from_path(&exe_file->f_path);
+	fput(exe_file);
+	return cp;
+}
+
+/**
+ * tomoyo_get_mode - Get MAC mode.
+ *
+ * @ns:      Pointer to "struct tomoyo_policy_namespace".
+ * @profile: Profile number.
+ * @index:   Index number of functionality.
+ *
+ * Returns mode.
+ */
+int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
+		    const u8 index)
+{
+	u8 mode;
+	struct tomoyo_profile *p;
+
+	if (!tomoyo_policy_loaded)
+		return TOMOYO_CONFIG_DISABLED;
+	p = tomoyo_profile(ns, profile);
+	mode = p->config[index];
+	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+		mode = p->config[tomoyo_index2category[index]
+				 + TOMOYO_MAX_MAC_INDEX];
+	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+		mode = p->default_config;
+	return mode & 3;
+}
+
+/**
+ * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members.
+ *
+ * @r:      Pointer to "struct tomoyo_request_info" to initialize.
+ * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain().
+ * @index:  Index number of functionality.
+ *
+ * Returns mode.
+ */
+int tomoyo_init_request_info(struct tomoyo_request_info *r,
+			     struct tomoyo_domain_info *domain, const u8 index)
+{
+	u8 profile;
+
+	memset(r, 0, sizeof(*r));
+	if (!domain)
+		domain = tomoyo_domain();
+	r->domain = domain;
+	profile = domain->profile;
+	r->profile = profile;
+	r->type = index;
+	r->mode = tomoyo_get_mode(domain->ns, profile, index);
+	return r->mode;
+}
+
+/**
+ * tomoyo_domain_quota_is_ok - Check for domain's quota.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns true if the domain is not exceeded quota, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
+{
+	unsigned int count = 0;
+	struct tomoyo_domain_info *domain = r->domain;
+	struct tomoyo_acl_info *ptr;
+
+	if (r->mode != TOMOYO_CONFIG_LEARNING)
+		return false;
+	if (!domain)
+		return true;
+	if (READ_ONCE(domain->flags[TOMOYO_DIF_QUOTA_WARNED]))
+		return false;
+	list_for_each_entry_rcu(ptr, &domain->acl_info_list, list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		u16 perm;
+
+		if (ptr->is_deleted)
+			continue;
+		/*
+		 * Reading perm bitmap might race with tomoyo_merge_*() because
+		 * caller does not hold tomoyo_policy_lock mutex. But exceeding
+		 * max_learning_entry parameter by a few entries does not harm.
+		 */
+		switch (ptr->type) {
+		case TOMOYO_TYPE_PATH_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_path_acl, head)->perm);
+			break;
+		case TOMOYO_TYPE_PATH2_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_path2_acl, head)->perm);
+			break;
+		case TOMOYO_TYPE_PATH_NUMBER_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_path_number_acl, head)
+				  ->perm);
+			break;
+		case TOMOYO_TYPE_MKDEV_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_mkdev_acl, head)->perm);
+			break;
+		case TOMOYO_TYPE_INET_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_inet_acl, head)->perm);
+			break;
+		case TOMOYO_TYPE_UNIX_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_unix_acl, head)->perm);
+			break;
+		case TOMOYO_TYPE_MANUAL_TASK_ACL:
+			perm = 0;
+			break;
+		default:
+			perm = 1;
+		}
+		count += hweight16(perm);
+	}
+	if (count < tomoyo_profile(domain->ns, domain->profile)->
+	    pref[TOMOYO_PREF_MAX_LEARNING_ENTRY])
+		return true;
+	WRITE_ONCE(domain->flags[TOMOYO_DIF_QUOTA_WARNED], true);
+	/* r->granted = false; */
+	tomoyo_write_log(r, "%s", tomoyo_dif[TOMOYO_DIF_QUOTA_WARNED]);
+#ifndef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
+	pr_warn("WARNING: Domain '%s' has too many ACLs to hold. Stopped learning mode.\n",
+		domain->domainname->name);
+#endif
+	return false;
+}