Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 461 insertions, 0 deletions

diff --git a/fs/ecryptfs/messaging.c b/fs/ecryptfs/messaging.c
new file mode 100644
index 000000000..73c7b8215
--- /dev/null
+++ b/fs/ecryptfs/messaging.c
@@ -0,0 +1,461 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * eCryptfs: Linux filesystem encryption layer
+ *
+ * Copyright (C) 2004-2008 International Business Machines Corp.
+ *   Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
+ *		Tyler Hicks <code@tyhicks.com>
+ */
+#include <linux/overflow.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/user_namespace.h>
+#include <linux/nsproxy.h>
+#include "ecryptfs_kernel.h"
+
+static LIST_HEAD(ecryptfs_msg_ctx_free_list);
+static LIST_HEAD(ecryptfs_msg_ctx_alloc_list);
+static DEFINE_MUTEX(ecryptfs_msg_ctx_lists_mux);
+
+static struct hlist_head *ecryptfs_daemon_hash;
+DEFINE_MUTEX(ecryptfs_daemon_hash_mux);
+static int ecryptfs_hash_bits;
+#define ecryptfs_current_euid_hash(uid) \
+	hash_long((unsigned long)from_kuid(&init_user_ns, current_euid()), ecryptfs_hash_bits)
+
+static u32 ecryptfs_msg_counter;
+static struct ecryptfs_msg_ctx *ecryptfs_msg_ctx_arr;
+
+/**
+ * ecryptfs_acquire_free_msg_ctx
+ * @msg_ctx: The context that was acquired from the free list
+ *
+ * Acquires a context element from the free list and locks the mutex
+ * on the context.  Sets the msg_ctx task to current.  Returns zero on
+ * success; non-zero on error or upon failure to acquire a free
+ * context element.  Must be called with ecryptfs_msg_ctx_lists_mux
+ * held.
+ */
+static int ecryptfs_acquire_free_msg_ctx(struct ecryptfs_msg_ctx **msg_ctx)
+{
+	struct list_head *p;
+	int rc;
+
+	if (list_empty(&ecryptfs_msg_ctx_free_list)) {
+		printk(KERN_WARNING "%s: The eCryptfs free "
+		       "context list is empty.  It may be helpful to "
+		       "specify the ecryptfs_message_buf_len "
+		       "parameter to be greater than the current "
+		       "value of [%d]\n", __func__, ecryptfs_message_buf_len);
+		rc = -ENOMEM;
+		goto out;
+	}
+	list_for_each(p, &ecryptfs_msg_ctx_free_list) {
+		*msg_ctx = list_entry(p, struct ecryptfs_msg_ctx, node);
+		if (mutex_trylock(&(*msg_ctx)->mux)) {
+			(*msg_ctx)->task = current;
+			rc = 0;
+			goto out;
+		}
+	}
+	rc = -ENOMEM;
+out:
+	return rc;
+}
+
+/**
+ * ecryptfs_msg_ctx_free_to_alloc
+ * @msg_ctx: The context to move from the free list to the alloc list
+ *
+ * Must be called with ecryptfs_msg_ctx_lists_mux held.
+ */
+static void ecryptfs_msg_ctx_free_to_alloc(struct ecryptfs_msg_ctx *msg_ctx)
+{
+	list_move(&msg_ctx->node, &ecryptfs_msg_ctx_alloc_list);
+	msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_PENDING;
+	msg_ctx->counter = ++ecryptfs_msg_counter;
+}
+
+/**
+ * ecryptfs_msg_ctx_alloc_to_free
+ * @msg_ctx: The context to move from the alloc list to the free list
+ *
+ * Must be called with ecryptfs_msg_ctx_lists_mux held.
+ */
+void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx)
+{
+	list_move(&(msg_ctx->node), &ecryptfs_msg_ctx_free_list);
+	kfree(msg_ctx->msg);
+	msg_ctx->msg = NULL;
+	msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_FREE;
+}
+
+/**
+ * ecryptfs_find_daemon_by_euid
+ * @daemon: If return value is zero, points to the desired daemon pointer
+ *
+ * Must be called with ecryptfs_daemon_hash_mux held.
+ *
+ * Search the hash list for the current effective user id.
+ *
+ * Returns zero if the user id exists in the list; non-zero otherwise.
+ */
+int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon)
+{
+	int rc;
+
+	hlist_for_each_entry(*daemon,
+			    &ecryptfs_daemon_hash[ecryptfs_current_euid_hash()],
+			    euid_chain) {
+		if (uid_eq((*daemon)->file->f_cred->euid, current_euid())) {
+			rc = 0;
+			goto out;
+		}
+	}
+	rc = -EINVAL;
+out:
+	return rc;
+}
+
+/**
+ * ecryptfs_spawn_daemon - Create and initialize a new daemon struct
+ * @daemon: Pointer to set to newly allocated daemon struct
+ * @file: File used when opening /dev/ecryptfs
+ *
+ * Must be called ceremoniously while in possession of
+ * ecryptfs_sacred_daemon_hash_mux
+ *
+ * Returns zero on success; non-zero otherwise
+ */
+int
+ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file)
+{
+	int rc = 0;
+
+	(*daemon) = kzalloc_obj(**daemon);
+	if (!(*daemon)) {
+		rc = -ENOMEM;
+		goto out;
+	}
+	(*daemon)->file = file;
+	mutex_init(&(*daemon)->mux);
+	INIT_LIST_HEAD(&(*daemon)->msg_ctx_out_queue);
+	init_waitqueue_head(&(*daemon)->wait);
+	(*daemon)->num_queued_msg_ctx = 0;
+	hlist_add_head(&(*daemon)->euid_chain,
+		       &ecryptfs_daemon_hash[ecryptfs_current_euid_hash()]);
+out:
+	return rc;
+}
+
+/*
+ * ecryptfs_exorcise_daemon - Destroy the daemon struct
+ *
+ * Must be called ceremoniously while in possession of
+ * ecryptfs_daemon_hash_mux and the daemon's own mux.
+ */
+int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon)
+{
+	struct ecryptfs_msg_ctx *msg_ctx, *msg_ctx_tmp;
+	int rc = 0;
+
+	mutex_lock(&daemon->mux);
+	if ((daemon->flags & ECRYPTFS_DAEMON_IN_READ)
+	    || (daemon->flags & ECRYPTFS_DAEMON_IN_POLL)) {
+		rc = -EBUSY;
+		mutex_unlock(&daemon->mux);
+		goto out;
+	}
+	mutex_lock(&ecryptfs_msg_ctx_lists_mux);
+	list_for_each_entry_safe(msg_ctx, msg_ctx_tmp,
+				 &daemon->msg_ctx_out_queue, daemon_out_list) {
+		list_del(&msg_ctx->daemon_out_list);
+		daemon->num_queued_msg_ctx--;
+		printk(KERN_WARNING "%s: Warning: dropping message that is in "
+		       "the out queue of a dying daemon\n", __func__);
+		ecryptfs_msg_ctx_alloc_to_free(msg_ctx);
+	}
+	mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
+	hlist_del(&daemon->euid_chain);
+	mutex_unlock(&daemon->mux);
+	kfree_sensitive(daemon);
+out:
+	return rc;
+}
+
+/**
+ * ecryptfs_process_response
+ * @daemon: eCryptfs daemon object
+ * @msg: The ecryptfs message received; the caller should sanity check
+ *       msg->data_len and free the memory
+ * @seq: The sequence number of the message; must match the sequence
+ *       number for the existing message context waiting for this
+ *       response
+ *
+ * Processes a response message after sending an operation request to
+ * userspace. Some other process is awaiting this response. Before
+ * sending out its first communications, the other process allocated a
+ * msg_ctx from the ecryptfs_msg_ctx_arr at a particular index. The
+ * response message contains this index so that we can copy over the
+ * response message into the msg_ctx that the process holds a
+ * reference to. The other process is going to wake up, check to see
+ * that msg_ctx->state == ECRYPTFS_MSG_CTX_STATE_DONE, and then
+ * proceed to read off and process the response message. Returns zero
+ * upon delivery to desired context element; non-zero upon delivery
+ * failure or error.
+ *
+ * Returns zero on success; non-zero otherwise
+ */
+int ecryptfs_process_response(struct ecryptfs_daemon *daemon,
+			      struct ecryptfs_message *msg, u32 seq)
+{
+	struct ecryptfs_msg_ctx *msg_ctx;
+	size_t msg_size;
+	int rc;
+
+	if (msg->index >= ecryptfs_message_buf_len) {
+		rc = -EINVAL;
+		printk(KERN_ERR "%s: Attempt to reference "
+		       "context buffer at index [%d]; maximum "
+		       "allowable is [%d]\n", __func__, msg->index,
+		       (ecryptfs_message_buf_len - 1));
+		goto out;
+	}
+	msg_ctx = &ecryptfs_msg_ctx_arr[msg->index];
+	mutex_lock(&msg_ctx->mux);
+	if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_PENDING) {
+		rc = -EINVAL;
+		printk(KERN_WARNING "%s: Desired context element is not "
+		       "pending a response\n", __func__);
+		goto unlock;
+	} else if (msg_ctx->counter != seq) {
+		rc = -EINVAL;
+		printk(KERN_WARNING "%s: Invalid message sequence; "
+		       "expected [%d]; received [%d]\n", __func__,
+		       msg_ctx->counter, seq);
+		goto unlock;
+	}
+	msg_size = struct_size(msg, data, msg->data_len);
+	msg_ctx->msg = kmemdup(msg, msg_size, GFP_KERNEL);
+	if (!msg_ctx->msg) {
+		rc = -ENOMEM;
+		goto unlock;
+	}
+	msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_DONE;
+	wake_up_process(msg_ctx->task);
+	rc = 0;
+unlock:
+	mutex_unlock(&msg_ctx->mux);
+out:
+	return rc;
+}
+
+/**
+ * ecryptfs_send_message_locked
+ * @data: The data to send
+ * @data_len: The length of data
+ * @msg_type: Type of message
+ * @msg_ctx: The message context allocated for the send
+ *
+ * Must be called with ecryptfs_daemon_hash_mux held.
+ *
+ * Returns zero on success; non-zero otherwise
+ */
+static int
+ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type,
+			     struct ecryptfs_msg_ctx **msg_ctx)
+{
+	struct ecryptfs_daemon *daemon;
+	int rc;
+
+	rc = ecryptfs_find_daemon_by_euid(&daemon);
+	if (rc) {
+		rc = -ENOTCONN;
+		goto out;
+	}
+	mutex_lock(&ecryptfs_msg_ctx_lists_mux);
+	rc = ecryptfs_acquire_free_msg_ctx(msg_ctx);
+	if (rc) {
+		mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
+		printk(KERN_WARNING "%s: Could not claim a free "
+		       "context element\n", __func__);
+		goto out;
+	}
+	ecryptfs_msg_ctx_free_to_alloc(*msg_ctx);
+	mutex_unlock(&(*msg_ctx)->mux);
+	mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
+	rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type, 0,
+				   daemon);
+	if (rc) {
+		printk(KERN_ERR "%s: Error attempting to send message to "
+		       "userspace daemon; rc = [%d]\n", __func__, rc);
+		mutex_lock(&ecryptfs_msg_ctx_lists_mux);
+		mutex_lock(&(*msg_ctx)->mux);
+		ecryptfs_msg_ctx_alloc_to_free(*msg_ctx);
+		mutex_unlock(&(*msg_ctx)->mux);
+		mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
+		*msg_ctx = NULL;
+	}
+out:
+	return rc;
+}
+
+/**
+ * ecryptfs_send_message
+ * @data: The data to send
+ * @data_len: The length of data
+ * @msg_ctx: The message context allocated for the send
+ *
+ * Grabs ecryptfs_daemon_hash_mux.
+ *
+ * Returns zero on success; non-zero otherwise
+ */
+int ecryptfs_send_message(char *data, int data_len,
+			  struct ecryptfs_msg_ctx **msg_ctx)
+{
+	int rc;
+
+	mutex_lock(&ecryptfs_daemon_hash_mux);
+	rc = ecryptfs_send_message_locked(data, data_len, ECRYPTFS_MSG_REQUEST,
+					  msg_ctx);
+	mutex_unlock(&ecryptfs_daemon_hash_mux);
+	return rc;
+}
+
+/**
+ * ecryptfs_wait_for_response
+ * @msg_ctx: The context that was assigned when sending a message
+ * @msg: The incoming message from userspace; not set if rc != 0
+ *
+ * Sleeps until awaken by ecryptfs_receive_message or until the amount
+ * of time exceeds ecryptfs_message_wait_timeout.  If zero is
+ * returned, msg will point to a valid message from userspace; a
+ * non-zero value is returned upon failure to receive a message or an
+ * error occurs. Callee must free @msg on success.
+ */
+int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
+			       struct ecryptfs_message **msg)
+{
+	signed long timeout = ecryptfs_message_wait_timeout * HZ;
+	int rc = 0;
+
+sleep:
+	timeout = schedule_timeout_interruptible(timeout);
+	mutex_lock(&ecryptfs_msg_ctx_lists_mux);
+	mutex_lock(&msg_ctx->mux);
+	if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_DONE) {
+		if (timeout) {
+			mutex_unlock(&msg_ctx->mux);
+			mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
+			goto sleep;
+		}
+		rc = -ENOMSG;
+	} else {
+		*msg = msg_ctx->msg;
+		msg_ctx->msg = NULL;
+	}
+	ecryptfs_msg_ctx_alloc_to_free(msg_ctx);
+	mutex_unlock(&msg_ctx->mux);
+	mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
+	return rc;
+}
+
+int __init ecryptfs_init_messaging(void)
+{
+	int i;
+	int rc = 0;
+
+	if (ecryptfs_number_of_users > ECRYPTFS_MAX_NUM_USERS) {
+		ecryptfs_number_of_users = ECRYPTFS_MAX_NUM_USERS;
+		printk(KERN_WARNING "%s: Specified number of users is "
+		       "too large, defaulting to [%d] users\n", __func__,
+		       ecryptfs_number_of_users);
+	}
+	mutex_lock(&ecryptfs_daemon_hash_mux);
+	ecryptfs_hash_bits = 1;
+	while (ecryptfs_number_of_users >> ecryptfs_hash_bits)
+		ecryptfs_hash_bits++;
+	ecryptfs_daemon_hash = kmalloc((sizeof(struct hlist_head)
+					* (1 << ecryptfs_hash_bits)),
+				       GFP_KERNEL);
+	if (!ecryptfs_daemon_hash) {
+		rc = -ENOMEM;
+		mutex_unlock(&ecryptfs_daemon_hash_mux);
+		goto out;
+	}
+	for (i = 0; i < (1 << ecryptfs_hash_bits); i++)
+		INIT_HLIST_HEAD(&ecryptfs_daemon_hash[i]);
+	mutex_unlock(&ecryptfs_daemon_hash_mux);
+	ecryptfs_msg_ctx_arr = kmalloc((sizeof(struct ecryptfs_msg_ctx)
+					* ecryptfs_message_buf_len),
+				       GFP_KERNEL);
+	if (!ecryptfs_msg_ctx_arr) {
+		kfree(ecryptfs_daemon_hash);
+		rc = -ENOMEM;
+		goto out;
+	}
+	mutex_lock(&ecryptfs_msg_ctx_lists_mux);
+	ecryptfs_msg_counter = 0;
+	for (i = 0; i < ecryptfs_message_buf_len; i++) {
+		INIT_LIST_HEAD(&ecryptfs_msg_ctx_arr[i].node);
+		INIT_LIST_HEAD(&ecryptfs_msg_ctx_arr[i].daemon_out_list);
+		mutex_init(&ecryptfs_msg_ctx_arr[i].mux);
+		mutex_lock(&ecryptfs_msg_ctx_arr[i].mux);
+		ecryptfs_msg_ctx_arr[i].index = i;
+		ecryptfs_msg_ctx_arr[i].state = ECRYPTFS_MSG_CTX_STATE_FREE;
+		ecryptfs_msg_ctx_arr[i].counter = 0;
+		ecryptfs_msg_ctx_arr[i].task = NULL;
+		ecryptfs_msg_ctx_arr[i].msg = NULL;
+		list_add_tail(&ecryptfs_msg_ctx_arr[i].node,
+			      &ecryptfs_msg_ctx_free_list);
+		mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux);
+	}
+	mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
+	rc = ecryptfs_init_ecryptfs_miscdev();
+	if (rc)
+		ecryptfs_release_messaging();
+out:
+	return rc;
+}
+
+void ecryptfs_release_messaging(void)
+{
+	if (ecryptfs_msg_ctx_arr) {
+		int i;
+
+		mutex_lock(&ecryptfs_msg_ctx_lists_mux);
+		for (i = 0; i < ecryptfs_message_buf_len; i++) {
+			mutex_lock(&ecryptfs_msg_ctx_arr[i].mux);
+			kfree(ecryptfs_msg_ctx_arr[i].msg);
+			mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux);
+		}
+		kfree(ecryptfs_msg_ctx_arr);
+		mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
+	}
+	if (ecryptfs_daemon_hash) {
+		struct ecryptfs_daemon *daemon;
+		struct hlist_node *n;
+		int i;
+
+		mutex_lock(&ecryptfs_daemon_hash_mux);
+		for (i = 0; i < (1 << ecryptfs_hash_bits); i++) {
+			int rc;
+
+			hlist_for_each_entry_safe(daemon, n,
+						  &ecryptfs_daemon_hash[i],
+						  euid_chain) {
+				rc = ecryptfs_exorcise_daemon(daemon);
+				if (rc)
+					printk(KERN_ERR "%s: Error whilst "
+					       "attempting to destroy daemon; "
+					       "rc = [%d]. Dazed and confused, "
+					       "but trying to continue.\n",
+					       __func__, rc);
+			}
+		}
+		kfree(ecryptfs_daemon_hash);
+		mutex_unlock(&ecryptfs_daemon_hash_mux);
+	}
+	ecryptfs_destroy_ecryptfs_miscdev();
+	return;
+}