From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- fs/ntfs/ea.c | 1118 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1118 insertions(+) create mode 100644 fs/ntfs/ea.c (limited to 'fs/ntfs/ea.c') diff --git a/fs/ntfs/ea.c b/fs/ntfs/ea.c new file mode 100644 index 000000000..cdd306933 --- /dev/null +++ b/fs/ntfs/ea.c @@ -0,0 +1,1118 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Pocessing of EA's + * + * Part of this file is based on code from the NTFS-3G. + * + * Copyright (c) 2014-2021 Jean-Pierre Andre + * Copyright (c) 2025 LG Electronics Co., Ltd. + */ + +#include +#include +#include +#include + +#include "layout.h" +#include "attrib.h" +#include "index.h" +#include "dir.h" +#include "ea.h" + +static int ntfs_write_ea(struct ntfs_inode *ni, __le32 type, char *value, s64 ea_off, + s64 ea_size, bool need_truncate) +{ + struct inode *ea_vi; + int err = 0; + s64 written; + + ea_vi = ntfs_attr_iget(VFS_I(ni), type, AT_UNNAMED, 0); + if (IS_ERR(ea_vi)) + return PTR_ERR(ea_vi); + + written = ntfs_inode_attr_pwrite(ea_vi, ea_off, ea_size, value, false); + if (written != ea_size) + err = -EIO; + else { + struct ntfs_inode *ea_ni = NTFS_I(ea_vi); + + if (need_truncate && ea_ni->data_size > ea_off + ea_size) + ntfs_attr_truncate(ea_ni, ea_off + ea_size); + mark_mft_record_dirty(ni); + } + + iput(ea_vi); + return err; +} + +static int ntfs_ea_lookup(char *ea_buf, s64 ea_buf_size, const char *name, + int name_len, s64 *ea_offset, s64 *ea_size) +{ + const struct ea_attr *p_ea; + size_t actual_size; + loff_t offset, p_ea_size; + unsigned int next; + + offset = 0; + do { + if (ea_buf_size - offset < sizeof(struct ea_attr)) + break; + + p_ea = (const struct ea_attr *)&ea_buf[offset]; + next = le32_to_cpu(p_ea->next_entry_offset); + p_ea_size = next ? next : (ea_buf_size - offset); + + if (p_ea_size < sizeof(struct ea_attr) || + offset + p_ea_size > ea_buf_size) + break; + + if ((s64)p_ea->ea_name_length + 1 > + p_ea_size - offsetof(struct ea_attr, ea_name)) + break; + + actual_size = ALIGN(struct_size(p_ea, ea_name, 1 + p_ea->ea_name_length + + le16_to_cpu(p_ea->ea_value_length)), 4); + if (actual_size > p_ea_size) + break; + + if (p_ea->ea_name_length == name_len && + !memcmp(p_ea->ea_name, name, name_len)) { + *ea_offset = offset; + *ea_size = next ? next : actual_size; + + if (ea_buf_size < *ea_offset + *ea_size) + goto out; + + return 0; + } + offset += next; + } while (next > 0 && offset < ea_buf_size); + +out: + return -ENOENT; +} + +/* + * Return the existing EA + * + * The EA_INFORMATION is not examined and the consistency of the + * existing EA is not checked. + * + * If successful, the full attribute is returned unchanged + * and its size is returned. + * If the designated buffer is too small, the needed size is + * returned, and the buffer is left unchanged. + * If there is an error, a negative value is returned and errno + * is set according to the error. + */ +static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len, + void *buffer, size_t size) +{ + struct ntfs_inode *ni = NTFS_I(inode); + const struct ea_attr *p_ea; + char *ea_buf; + s64 ea_off, ea_size, all_ea_size, ea_info_size; + int err; + u32 ea_info_qlen; + u16 ea_value_len; + struct ea_information *p_ea_info; + + if (!NInoHasEA(ni)) + return -ENODATA; + + p_ea_info = ntfs_attr_readall(ni, AT_EA_INFORMATION, NULL, 0, + &ea_info_size); + if (IS_ERR(p_ea_info)) + return PTR_ERR(p_ea_info); + if (ea_info_size != sizeof(struct ea_information)) { + kvfree(p_ea_info); + return -EIO; + } + + ea_info_qlen = le32_to_cpu(p_ea_info->ea_query_length); + kvfree(p_ea_info); + + ea_buf = ntfs_attr_readall(ni, AT_EA, NULL, 0, &all_ea_size); + if (IS_ERR(ea_buf)) + return PTR_ERR(ea_buf); + + if (ea_info_qlen > all_ea_size) { + err = -EIO; + goto free_ea_buf; + } + + err = ntfs_ea_lookup(ea_buf, ea_info_qlen, name, name_len, &ea_off, + &ea_size); + if (!err) { + p_ea = (struct ea_attr *)&ea_buf[ea_off]; + ea_value_len = le16_to_cpu(p_ea->ea_value_length); + if (!buffer) { + kvfree(ea_buf); + return ea_value_len; + } + + if (ea_value_len > size) { + err = -ERANGE; + goto free_ea_buf; + } + + memcpy(buffer, &p_ea->ea_name[p_ea->ea_name_length + 1], + ea_value_len); + kvfree(ea_buf); + return ea_value_len; + } + + err = -ENODATA; +free_ea_buf: + kvfree(ea_buf); + return err; +} + +static inline int ea_packed_size(const struct ea_attr *p_ea) +{ + /* + * 4 bytes for header (flags and lengths) + name length + 1 + + * value length. + */ + return 5 + p_ea->ea_name_length + le16_to_cpu(p_ea->ea_value_length); +} + +/* + * Set a new EA, and set EA_INFORMATION accordingly + * + * This is roughly the same as ZwSetEaFile() on Windows, however + * the "offset to next" of the last EA should not be cleared. + * + * Consistency of the new EA is first checked. + * + * EA_INFORMATION is set first, and it is restored to its former + * state if setting EA fails. + */ +static int ntfs_set_ea(struct inode *inode, const char *name, size_t name_len, + const void *value, size_t val_size, int flags, + __le16 *packed_ea_size) +{ + struct ntfs_inode *ni = NTFS_I(inode); + struct ea_information *p_ea_info = NULL; + int ea_packed, err = 0; + struct ea_attr *p_ea; + u32 ea_info_qsize = 0; + char *ea_buf = NULL; + char *new_ea_buf; + char *old_ea_buf = NULL; + struct ea_information old_ea_info; + size_t new_ea_size = ALIGN(struct_size(p_ea, ea_name, 1 + name_len + val_size), 4); + s64 ea_off, ea_info_size, all_ea_size, ea_size; + + if (name_len > 255) + return -ENAMETOOLONG; + + if (ntfs_attr_exist(ni, AT_EA_INFORMATION, AT_UNNAMED, 0)) { + p_ea_info = ntfs_attr_readall(ni, AT_EA_INFORMATION, NULL, 0, + &ea_info_size); + if (IS_ERR(p_ea_info)) { + err = PTR_ERR(p_ea_info); + p_ea_info = NULL; + goto out; + } + if (ea_info_size != sizeof(struct ea_information)) { + err = -EIO; + goto out; + } + + ea_buf = ntfs_attr_readall(ni, AT_EA, NULL, 0, &all_ea_size); + if (IS_ERR(ea_buf)) { + err = PTR_ERR(ea_buf); + ea_buf = NULL; + goto out; + } + if (!ea_buf) { + ea_info_qsize = 0; + kvfree(p_ea_info); + goto create_ea_info; + } + + ea_info_qsize = le32_to_cpu(p_ea_info->ea_query_length); + } else { +create_ea_info: + p_ea_info = kzalloc(sizeof(struct ea_information), GFP_NOFS); + if (!p_ea_info) + return -ENOMEM; + + ea_info_qsize = 0; + err = ntfs_attr_add(ni, AT_EA_INFORMATION, AT_UNNAMED, 0, + (char *)p_ea_info, sizeof(struct ea_information)); + if (err) + goto out; + + if (ntfs_attr_exist(ni, AT_EA, AT_UNNAMED, 0)) { + err = ntfs_attr_remove(ni, AT_EA, AT_UNNAMED, 0); + if (err) + goto out; + } + + goto alloc_new_ea; + } + + if (ea_info_qsize > all_ea_size) { + err = -EIO; + goto out; + } + + err = ntfs_ea_lookup(ea_buf, ea_info_qsize, name, name_len, &ea_off, + &ea_size); + if (ea_info_qsize && !err) { + if (flags & XATTR_CREATE) { + err = -EEXIST; + goto out; + } + if ((flags & XATTR_REPLACE) && !val_size) { + old_ea_info = *p_ea_info; + old_ea_buf = kvmemdup(ea_buf, all_ea_size, GFP_NOFS); + if (!old_ea_buf) { + err = -ENOMEM; + goto out; + } + } + + /* Check the final $EA size before removing the old entry. */ + if (val_size && + ntfs_attr_size_bounds_check(ni->vol, AT_EA, + ea_info_qsize - ea_size + new_ea_size)) { + err = -EFBIG; + goto out; + } + + p_ea = (struct ea_attr *)(ea_buf + ea_off); + + if (val_size && + le16_to_cpu(p_ea->ea_value_length) == val_size && + !memcmp(p_ea->ea_name + p_ea->ea_name_length + 1, value, + val_size)) + goto out; + + le16_add_cpu(&p_ea_info->ea_length, 0 - ea_packed_size(p_ea)); + + if (p_ea->flags & NEED_EA) + le16_add_cpu(&p_ea_info->need_ea_count, -1); + + memmove((char *)p_ea, (char *)p_ea + ea_size, ea_info_qsize - (ea_off + ea_size)); + ea_info_qsize -= ea_size; + p_ea_info->ea_query_length = cpu_to_le32(ea_info_qsize); + + if ((flags & XATTR_REPLACE) && !val_size && !ea_info_qsize) { + err = ntfs_attr_remove(ni, AT_EA, AT_UNNAMED, 0); + if (err) + goto out; + + err = ntfs_attr_remove(ni, AT_EA_INFORMATION, AT_UNNAMED, 0); + if (err) { + /* Restore the original $EA if $EA_INFORMATION removal failed. */ + ntfs_attr_add(ni, AT_EA, AT_UNNAMED, 0, old_ea_buf, + all_ea_size); + ea_info_qsize = le32_to_cpu(old_ea_info.ea_query_length); + } + goto out; + } + + if ((flags & XATTR_REPLACE) && !val_size) { + err = ntfs_write_ea(ni, AT_EA, ea_buf, 0, ea_info_qsize, + true); + if (err) { + ntfs_write_ea(ni, AT_EA, old_ea_buf, 0, + all_ea_size, false); + goto out; + } + + err = ntfs_write_ea(ni, AT_EA_INFORMATION, (char *)p_ea_info, + 0, sizeof(struct ea_information), false); + if (err) { + ntfs_write_ea(ni, AT_EA, old_ea_buf, 0, + all_ea_size, false); + ntfs_write_ea(ni, AT_EA_INFORMATION, + (char *)&old_ea_info, 0, + sizeof(old_ea_info), false); + } + goto out; + } + } else { + if (flags & XATTR_REPLACE) { + err = -ENODATA; + goto out; + } + + if (ntfs_attr_size_bounds_check(ni->vol, AT_EA, + ea_info_qsize + new_ea_size)) { + err = -EFBIG; + goto out; + } + } +alloc_new_ea: + new_ea_buf = kvzalloc(ea_info_qsize + new_ea_size, GFP_NOFS); + if (!new_ea_buf) { + err = -ENOMEM; + goto out; + } + if (ea_info_qsize) + memcpy(new_ea_buf, ea_buf, ea_info_qsize); + kvfree(ea_buf); + ea_buf = new_ea_buf; + p_ea = (struct ea_attr *)(ea_buf + ea_info_qsize); + + /* + * EA and REPARSE_POINT compatibility not checked any more, + * required by Windows 10, but having both may lead to + * problems with earlier versions. + */ + memcpy(p_ea->ea_name, name, name_len); + p_ea->ea_name_length = name_len; + p_ea->ea_name[name_len] = 0; + memcpy(p_ea->ea_name + name_len + 1, value, val_size); + p_ea->ea_value_length = cpu_to_le16(val_size); + p_ea->next_entry_offset = cpu_to_le32(new_ea_size); + + ea_packed = le16_to_cpu(p_ea_info->ea_length) + ea_packed_size(p_ea); + p_ea_info->ea_length = cpu_to_le16(ea_packed); + p_ea_info->ea_query_length = cpu_to_le32(ea_info_qsize + new_ea_size); + + if (ea_packed > 0xffff) { + err = -EFBIG; + goto out; + } + + /* + * no EA or EA_INFORMATION : add them + */ + if (!ntfs_attr_exist(ni, AT_EA, AT_UNNAMED, 0)) { + err = ntfs_attr_add(ni, AT_EA, AT_UNNAMED, 0, ea_buf, + ea_info_qsize + new_ea_size); + if (err) + goto out; + } else { + err = ntfs_write_ea(ni, AT_EA, ea_buf, 0, + ea_info_qsize + new_ea_size, true); + if (err) + goto out; + } + + err = ntfs_write_ea(ni, AT_EA_INFORMATION, (char *)p_ea_info, 0, + sizeof(struct ea_information), false); + if (err) + goto out; + + if (packed_ea_size) + *packed_ea_size = p_ea_info->ea_length; + mark_mft_record_dirty(ni); +out: + if (ea_info_qsize > 0) + NInoSetHasEA(ni); + else + NInoClearHasEA(ni); + + kvfree(ea_buf); + kvfree(old_ea_buf); + kvfree(p_ea_info); + + return err; +} + +/* + * Check for the presence of an EA "$LXDEV" (used by WSL) + * and return its value as a device address + */ +int ntfs_ea_get_wsl_inode(struct inode *inode, dev_t *rdevp, unsigned int flags, + bool *has_lxmod) +{ + int err; + __le32 v; + + *has_lxmod = false; + + if (!(flags & NTFS_VOL_UID)) { + /* Load uid to lxuid EA */ + err = ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &v, + sizeof(v)); + if (err == sizeof(v)) + i_uid_write(inode, le32_to_cpu(v)); + } + + if (!(flags & NTFS_VOL_GID)) { + /* Load gid to lxgid EA */ + err = ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &v, + sizeof(v)); + if (err == sizeof(v)) + i_gid_write(inode, le32_to_cpu(v)); + } + + /* Load mode to lxmod EA */ + err = ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &v, sizeof(v)); + if (err == sizeof(v)) { + inode->i_mode = le32_to_cpu(v); + *has_lxmod = true; + } else { + /* Everyone gets all permissions. */ + inode->i_mode |= 0777; + } + + /* Load mode to lxdev EA */ + err = ntfs_get_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &v, sizeof(v)); + if (err == sizeof(v)) + *rdevp = le32_to_cpu(v); + err = 0; + + return err; +} + +int ntfs_ea_set_wsl_inode(struct inode *inode, dev_t rdev, __le16 *ea_size, + unsigned int flags) +{ + __le32 v; + int err = 0; + + if (ea_size) + *ea_size = 0; + + if (flags & NTFS_EA_UID) { + /* Store uid to lxuid EA */ + v = cpu_to_le32(i_uid_read(inode)); + err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &v, + sizeof(v), 0, ea_size); + if (err) + return err; + } + + if (flags & NTFS_EA_GID) { + /* Store gid to lxgid EA */ + v = cpu_to_le32(i_gid_read(inode)); + err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &v, + sizeof(v), 0, ea_size); + if (err) + return err; + } + + if (flags & NTFS_EA_MODE) { + /* Store mode to lxmod EA */ + v = cpu_to_le32(inode->i_mode); + err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &v, + sizeof(v), 0, ea_size); + if (err) + return err; + } + + if (rdev) { + v = cpu_to_le32(rdev); + err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &v, sizeof(v), + 0, ea_size); + } + + return err; +} + +ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size) +{ + struct inode *inode = d_inode(dentry); + struct ntfs_inode *ni = NTFS_I(inode); + const struct ea_attr *p_ea; + s64 offset, ea_buf_size, ea_info_size; + s64 ea_size; + u32 next; + int err = 0; + u32 ea_info_qsize; + char *ea_buf = NULL; + ssize_t ret = 0; + struct ea_information *ea_info; + + if (!NInoHasEA(ni)) + return 0; + + mutex_lock(&NTFS_I(inode)->mrec_lock); + ea_info = ntfs_attr_readall(ni, AT_EA_INFORMATION, NULL, 0, + &ea_info_size); + if (IS_ERR(ea_info)) { + err = PTR_ERR(ea_info); + ea_info = NULL; + goto out; + } + if (ea_info_size != sizeof(struct ea_information)) { + err = -EIO; + goto out; + } + + ea_info_qsize = le32_to_cpu(ea_info->ea_query_length); + + ea_buf = ntfs_attr_readall(ni, AT_EA, NULL, 0, &ea_buf_size); + if (IS_ERR(ea_buf)) { + err = PTR_ERR(ea_buf); + ea_buf = NULL; + goto out; + } + + if (ea_info_qsize > ea_buf_size || ea_info_qsize == 0) + goto out; + + offset = 0; + do { + if (ea_info_qsize - offset < sizeof(struct ea_attr)) { + err = -EIO; + goto out; + } + + p_ea = (const struct ea_attr *)&ea_buf[offset]; + next = le32_to_cpu(p_ea->next_entry_offset); + ea_size = next ? next : (ea_info_qsize - offset); + + if (ea_size < sizeof(struct ea_attr) || + offset + ea_size > ea_info_qsize) { + err = -EIO; + goto out; + } + + if ((int)p_ea->ea_name_length + 1 > + ea_size - offsetof(struct ea_attr, ea_name)) { + err = -EIO; + goto out; + } + + if (buffer) { + if (ret + p_ea->ea_name_length + 1 > size) { + err = -ERANGE; + goto out; + } + + memcpy(buffer + ret, p_ea->ea_name, p_ea->ea_name_length); + buffer[ret + p_ea->ea_name_length] = 0; + } + + ret += p_ea->ea_name_length + 1; + offset += ea_size; + } while (next > 0 && offset < ea_info_qsize); + +out: + mutex_unlock(&NTFS_I(inode)->mrec_lock); + kvfree(ea_info); + kvfree(ea_buf); + + return err ? err : ret; +} + +// clang-format off +#define SYSTEM_DOS_ATTRIB "system.dos_attrib" +#define SYSTEM_NTFS_ATTRIB "system.ntfs_attrib" +#define SYSTEM_NTFS_ATTRIB_BE "system.ntfs_attrib_be" +// clang-format on + +static int ntfs_getxattr(const struct xattr_handler *handler, + struct dentry *unused, struct inode *inode, const char *name, + void *buffer, size_t size) +{ + struct ntfs_inode *ni = NTFS_I(inode); + int err; + + if (NVolShutdown(ni->vol)) + return -EIO; + + if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { + if (!buffer) { + err = sizeof(u8); + } else if (size < sizeof(u8)) { + err = -ENODATA; + } else { + err = sizeof(u8); + *(u8 *)buffer = (u8)(le32_to_cpu(ni->flags) & 0x3F); + } + goto out; + } + + if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || + !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { + if (!buffer) { + err = sizeof(u32); + } else if (size < sizeof(u32)) { + err = -ENODATA; + } else { + err = sizeof(u32); + *(u32 *)buffer = le32_to_cpu(ni->flags); + if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) + *(__be32 *)buffer = cpu_to_be32(*(u32 *)buffer); + } + goto out; + } + + mutex_lock(&ni->mrec_lock); + err = ntfs_get_ea(inode, name, strlen(name), buffer, size); + mutex_unlock(&ni->mrec_lock); + +out: + return err; +} + +static int ntfs_new_attr_flags(struct ntfs_inode *ni, __le32 fattr) +{ + struct ntfs_attr_search_ctx *ctx; + struct mft_record *m; + struct attr_record *a; + __le16 new_aflags; + u16 old_name_ofs, old_mp_ofs; + int mp_size, mp_ofs, name_ofs, old_arec_size, arec_size, err; + + m = map_mft_record(ni); + if (IS_ERR(m)) + return PTR_ERR(m); + + ctx = ntfs_attr_get_search_ctx(ni, m); + if (!ctx) { + err = -ENOMEM; + goto err_out; + } + + err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len, + CASE_SENSITIVE, 0, NULL, 0, ctx); + if (err) { + err = -EINVAL; + goto err_out; + } + + a = ctx->attr; + new_aflags = ctx->attr->flags; + + if (fattr & FILE_ATTR_SPARSE_FILE) + new_aflags |= ATTR_IS_SPARSE; + else + new_aflags &= ~ATTR_IS_SPARSE; + + if (fattr & FILE_ATTR_COMPRESSED) + new_aflags |= ATTR_IS_COMPRESSED; + else + new_aflags &= ~ATTR_IS_COMPRESSED; + + if (new_aflags == a->flags) { + err = 0; + goto err_out; + } + + if ((new_aflags & (ATTR_IS_SPARSE | ATTR_IS_COMPRESSED)) == + (ATTR_IS_SPARSE | ATTR_IS_COMPRESSED)) { + pr_err("file can't be sparsed and compressed\n"); + err = -EOPNOTSUPP; + goto err_out; + } + + if (!a->non_resident) { + if (!(new_aflags & (ATTR_IS_SPARSE | ATTR_IS_COMPRESSED))) { + err = 0; + goto err_out; + } + + if (le32_to_cpu(a->data.resident.value_length)) { + pr_err("Can't change sparse/compressed for non-empty file"); + err = -EOPNOTSUPP; + goto err_out; + } + + err = ntfs_attr_make_non_resident(ni, 0); + if (err) + goto err_out; + + ntfs_attr_reinit_search_ctx(ctx); + err = ntfs_attr_lookup(ni->type, ni->name, + ni->name_len, CASE_SENSITIVE, + 0, NULL, 0, ctx); + if (err) { + err = -EINVAL; + goto err_out; + } + a = ctx->attr; + } else { + if (a->data.non_resident.data_size) { + pr_err("Can't change sparsed/compressed for non-empty file"); + err = -EOPNOTSUPP; + goto err_out; + } + } + + old_name_ofs = le16_to_cpu(a->name_offset); + old_mp_ofs = le16_to_cpu(a->data.non_resident.mapping_pairs_offset); + + if (new_aflags & (ATTR_IS_SPARSE | ATTR_IS_COMPRESSED)) + name_ofs = (offsetof(struct attr_record, + data.non_resident.compressed_size) + + sizeof(a->data.non_resident.compressed_size) + 7) & ~7; + else + name_ofs = (offsetof(struct attr_record, + data.non_resident.compressed_size) + 7) & ~7; + + mp_size = ntfs_get_size_for_mapping_pairs(ni->vol, ni->runlist.rl, 0, -1, -1); + if (unlikely(mp_size < 0)) { + err = mp_size; + ntfs_debug("Failed to get size for mapping pairs array, error code %i.\n", err); + goto err_out; + } + + mp_ofs = (name_ofs + a->name_length * sizeof(__le16) + 7) & ~7; + arec_size = (mp_ofs + mp_size + 7) & ~7; + old_arec_size = le32_to_cpu(a->length); + + /* + * Move payloads before shrinking the record. Otherwise resizing moves + * the following attribute over the old payload before it can be copied. + */ + if (arec_size < old_arec_size) { + if (a->name_length && name_ofs != old_name_ofs) + memmove((u8 *)a + name_ofs, (u8 *)a + old_name_ofs, + a->name_length * sizeof(__le16)); + if (mp_ofs != old_mp_ofs) + memmove((u8 *)a + mp_ofs, (u8 *)a + old_mp_ofs, mp_size); + } + + err = ntfs_attr_record_resize(m, a, arec_size); + if (unlikely(err)) + goto err_out; + + /* + * When compressed/sparse state changes, the non-resident header grows or + * shrinks by the compressed_size field. Update the in-record payload layout + * to match the new offsets before exposing the new mapping_pairs_offset. + */ + if (arec_size > old_arec_size) { + if (mp_ofs != old_mp_ofs) + memmove((u8 *)a + mp_ofs, (u8 *)a + old_mp_ofs, mp_size); + if (a->name_length) + memmove((u8 *)a + name_ofs, (u8 *)a + old_name_ofs, + a->name_length * sizeof(__le16)); + } + + if (new_aflags & (ATTR_IS_SPARSE | ATTR_IS_COMPRESSED)) { + a->data.non_resident.compression_unit = 0; + if (new_aflags & ATTR_IS_COMPRESSED || ni->vol->major_ver < 3) + a->data.non_resident.compression_unit = 4; + a->data.non_resident.compressed_size = 0; + ni->itype.compressed.size = 0; + if (a->data.non_resident.compression_unit) { + ni->itype.compressed.block_size = 1U << + (a->data.non_resident.compression_unit + + ni->vol->cluster_size_bits); + ni->itype.compressed.block_size_bits = + ffs(ni->itype.compressed.block_size) - + 1; + ni->itype.compressed.block_clusters = 1U << + a->data.non_resident.compression_unit; + } else { + ni->itype.compressed.block_size = 0; + ni->itype.compressed.block_size_bits = 0; + ni->itype.compressed.block_clusters = 0; + } + } else { + a->data.non_resident.compression_unit = 0; + } + + a->name_offset = cpu_to_le16(name_ofs); + a->data.non_resident.mapping_pairs_offset = cpu_to_le16(mp_ofs); + + a->flags = new_aflags; + + if (new_aflags & ATTR_IS_SPARSE) { + NInoSetSparse(ni); + ni->flags |= FILE_ATTR_SPARSE_FILE; + } else { + NInoClearSparse(ni); + ni->flags &= ~FILE_ATTR_SPARSE_FILE; + } + + if (new_aflags & ATTR_IS_COMPRESSED) { + NInoSetCompressed(ni); + ni->flags |= FILE_ATTR_COMPRESSED; + } else { + NInoClearCompressed(ni); + ni->flags &= ~FILE_ATTR_COMPRESSED; + } + + mark_mft_record_dirty(ctx->ntfs_ino); +err_out: + if (ctx) + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(ni); + return err; +} + +static bool ntfs_is_reserved_lxattr(const char *name) +{ + return !strcmp(name, "$LXUID") || !strcmp(name, "$LXGID") || + !strcmp(name, "$LXMOD") || !strcmp(name, "$LXDEV"); +} + +static int ntfs_validate_fattr(struct ntfs_inode *ni, __le32 fattr) +{ + const __le32 wof_flags = FILE_ATTR_SPARSE_FILE | + FILE_ATTR_REPARSE_POINT; + + if (NInoWofCompressed(ni) && ((ni->flags ^ fattr) & wof_flags)) + return -EPERM; + + return 0; +} + +static int ntfs_setxattr(const struct xattr_handler *handler, + struct mnt_idmap *idmap, struct dentry *unused, + struct inode *inode, const char *name, const void *value, + size_t size, int flags) +{ + struct ntfs_inode *ni = NTFS_I(inode); + int err; + __le32 fattr; + + if (NVolShutdown(ni->vol)) + return -EIO; + + if (ntfs_is_reserved_lxattr(name) && !capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { + if (sizeof(u8) != size) { + err = -EINVAL; + goto out; + } + fattr = cpu_to_le32((le32_to_cpu(ni->flags) & ~0xffU) | + *(u8 *)value); + goto set_fattr; + } + + if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || + !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { + if (size != sizeof(u32)) { + err = -EINVAL; + goto out; + } + if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) + fattr = cpu_to_le32(be32_to_cpu(*(__be32 *)value)); + else + fattr = cpu_to_le32(*(u32 *)value); + + err = ntfs_validate_fattr(ni, fattr); + if (err) + goto out; + + if (S_ISREG(inode->i_mode)) { + mutex_lock(&ni->mrec_lock); + err = ntfs_new_attr_flags(ni, fattr); + mutex_unlock(&ni->mrec_lock); + if (err) + goto out; + } + +set_fattr: + if (S_ISDIR(inode->i_mode)) + fattr |= FILE_ATTR_DIRECTORY; + else + fattr &= ~FILE_ATTR_DIRECTORY; + + err = ntfs_validate_fattr(ni, fattr); + if (err) + goto out; + + if (ni->flags != fattr) { + ni->flags = fattr; + if (fattr & FILE_ATTR_READONLY) + inode->i_mode &= ~0222; + else + inode->i_mode |= 0222; + NInoSetFileNameDirty(ni); + mark_inode_dirty(inode); + } + err = 0; + goto out; + } + + mutex_lock(&ni->mrec_lock); + err = ntfs_set_ea(inode, name, strlen(name), value, size, flags, NULL); + mutex_unlock(&ni->mrec_lock); + +out: + if (!err) { + inode_set_ctime_current(inode); + mark_inode_dirty(inode); + } + return err; +} + +static bool ntfs_xattr_user_list(struct dentry *dentry) +{ + return true; +} + +// clang-format off +static const struct xattr_handler ntfs_other_xattr_handler = { + .prefix = "", + .get = ntfs_getxattr, + .set = ntfs_setxattr, + .list = ntfs_xattr_user_list, +}; + +const struct xattr_handler * const ntfs_xattr_handlers[] = { + &ntfs_other_xattr_handler, + NULL, +}; +// clang-format on + +#ifdef CONFIG_NTFS_FS_POSIX_ACL +struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry, + int type) +{ + struct inode *inode = d_inode(dentry); + struct ntfs_inode *ni = NTFS_I(inode); + const char *name; + size_t name_len; + struct posix_acl *acl; + int err; + void *buf; + + buf = kmalloc(PATH_MAX, GFP_KERNEL); + if (!buf) + return ERR_PTR(-ENOMEM); + + /* Possible values of 'type' was already checked above. */ + if (type == ACL_TYPE_ACCESS) { + name = XATTR_NAME_POSIX_ACL_ACCESS; + name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; + } else { + name = XATTR_NAME_POSIX_ACL_DEFAULT; + name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; + } + + mutex_lock(&ni->mrec_lock); + err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX); + mutex_unlock(&ni->mrec_lock); + + /* Translate extended attribute to acl. */ + if (err >= 0) + acl = posix_acl_from_xattr(&init_user_ns, buf, err); + else if (err == -ENODATA) + acl = NULL; + else + acl = ERR_PTR(err); + + if (!IS_ERR(acl)) + set_cached_acl(inode, type, acl); + + kfree(buf); + + return acl; +} + +static noinline int ntfs_set_acl_ex(struct mnt_idmap *idmap, + struct inode *inode, struct posix_acl *acl, + int type, bool init_acl) +{ + const char *name; + size_t size, name_len; + void *value; + int err; + int flags; + umode_t mode; + + if (S_ISLNK(inode->i_mode)) + return -EOPNOTSUPP; + + mode = inode->i_mode; + switch (type) { + case ACL_TYPE_ACCESS: + /* Do not change i_mode if we are in init_acl */ + if (acl && !init_acl) { + err = posix_acl_update_mode(idmap, inode, &mode, &acl); + if (err) + return err; + } + name = XATTR_NAME_POSIX_ACL_ACCESS; + name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; + break; + + case ACL_TYPE_DEFAULT: + if (!S_ISDIR(inode->i_mode)) + return acl ? -EACCES : 0; + name = XATTR_NAME_POSIX_ACL_DEFAULT; + name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; + break; + + default: + return -EINVAL; + } + + if (!acl) { + /* Remove xattr if it can be presented via mode. */ + size = 0; + value = NULL; + flags = XATTR_REPLACE; + } else { + value = posix_acl_to_xattr(&init_user_ns, acl, &size, GFP_NOFS); + if (!value) + return -ENOMEM; + flags = 0; + } + + mutex_lock(&NTFS_I(inode)->mrec_lock); + err = ntfs_set_ea(inode, name, name_len, value, size, flags, NULL); + mutex_unlock(&NTFS_I(inode)->mrec_lock); + if (err == -ENODATA && !size) + err = 0; /* Removing non existed xattr. */ + if (!err) { + __le16 ea_size = 0; + umode_t old_mode = inode->i_mode; + + inode->i_mode = mode; + mutex_lock(&NTFS_I(inode)->mrec_lock); + err = ntfs_ea_set_wsl_inode(inode, 0, &ea_size, NTFS_EA_MODE); + if (err) { + ntfs_set_ea(inode, name, name_len, NULL, 0, + XATTR_REPLACE, NULL); + mutex_unlock(&NTFS_I(inode)->mrec_lock); + inode->i_mode = old_mode; + goto out; + } + mutex_unlock(&NTFS_I(inode)->mrec_lock); + + set_cached_acl(inode, type, acl); + inode_set_ctime_current(inode); + mark_inode_dirty(inode); + } + +out: + kfree(value); + + return err; +} + +int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, + struct posix_acl *acl, int type) +{ + return ntfs_set_acl_ex(idmap, d_inode(dentry), acl, type, false); +} + +int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode, + struct inode *dir) +{ + struct posix_acl *default_acl, *acl; + int err; + + err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); + if (err) + return err; + + if (default_acl) { + err = ntfs_set_acl_ex(idmap, inode, default_acl, + ACL_TYPE_DEFAULT, true); + posix_acl_release(default_acl); + } else { + inode->i_default_acl = NULL; + } + + if (acl) { + if (!err) + err = ntfs_set_acl_ex(idmap, inode, acl, + ACL_TYPE_ACCESS, true); + posix_acl_release(acl); + } else { + inode->i_acl = NULL; + } + + return err; +} +#endif -- cgit v1.3.1