/
xattr.c
1156 lines (982 loc) · 24.1 KB
/
xattr.c
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// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
*
*/
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/nls.h>
#include <linux/posix_acl.h>
#include <linux/posix_acl_xattr.h>
#include <linux/xattr.h>
#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"
// clang-format off
#define SYSTEM_DOS_ATTRIB "system.dos_attrib"
#define SYSTEM_NTFS_ATTRIB "system.ntfs_attrib"
#define SYSTEM_NTFS_SECURITY "system.ntfs_security"
// clang-format on
static inline size_t unpacked_ea_size(const struct EA_FULL *ea)
{
return ea->size ? le32_to_cpu(ea->size)
: DwordAlign(struct_size(
ea, name,
1 + ea->name_len + le16_to_cpu(ea->elength)));
}
static inline size_t packed_ea_size(const struct EA_FULL *ea)
{
return struct_size(ea, name,
1 + ea->name_len + le16_to_cpu(ea->elength)) -
offsetof(struct EA_FULL, flags);
}
/*
* find_ea
*
* assume there is at least one xattr in the list
*/
static inline bool find_ea(const struct EA_FULL *ea_all, u32 bytes,
const char *name, u8 name_len, u32 *off)
{
*off = 0;
if (!ea_all || !bytes)
return false;
for (;;) {
const struct EA_FULL *ea = Add2Ptr(ea_all, *off);
u32 next_off = *off + unpacked_ea_size(ea);
if (next_off > bytes)
return false;
if (ea->name_len == name_len &&
!memcmp(ea->name, name, name_len))
return true;
*off = next_off;
if (next_off >= bytes)
return false;
}
}
/*
* ntfs_read_ea
*
* reads all extended attributes
* ea - new allocated memory
* info - pointer into resident data
*/
static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea,
size_t add_bytes, const struct EA_INFO **info)
{
int err;
struct ATTR_LIST_ENTRY *le = NULL;
struct ATTRIB *attr_info, *attr_ea;
void *ea_p;
u32 size;
static_assert(le32_to_cpu(ATTR_EA_INFO) < le32_to_cpu(ATTR_EA));
*ea = NULL;
*info = NULL;
attr_info =
ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, NULL);
attr_ea =
ni_find_attr(ni, attr_info, &le, ATTR_EA, NULL, 0, NULL, NULL);
if (!attr_ea || !attr_info)
return 0;
*info = resident_data_ex(attr_info, sizeof(struct EA_INFO));
if (!*info)
return -EINVAL;
/* Check Ea limit */
size = le32_to_cpu((*info)->size);
if (size > ni->mi.sbi->ea_max_size)
return -EFBIG;
if (attr_size(attr_ea) > ni->mi.sbi->ea_max_size)
return -EFBIG;
/* Allocate memory for packed Ea */
ea_p = ntfs_malloc(size + add_bytes);
if (!ea_p)
return -ENOMEM;
if (attr_ea->non_res) {
struct runs_tree run;
run_init(&run);
err = attr_load_runs(attr_ea, ni, &run, NULL);
if (!err)
err = ntfs_read_run_nb(ni->mi.sbi, &run, 0, ea_p, size,
NULL);
run_close(&run);
if (err)
goto out;
} else {
void *p = resident_data_ex(attr_ea, size);
if (!p) {
err = -EINVAL;
goto out;
}
memcpy(ea_p, p, size);
}
memset(Add2Ptr(ea_p, size), 0, add_bytes);
*ea = ea_p;
return 0;
out:
ntfs_free(ea_p);
*ea = NULL;
return err;
}
/*
* ntfs_list_ea
*
* copy a list of xattrs names into the buffer
* provided, or compute the buffer size required
*
* Returns a negative error number on failure, or the number of bytes
* used / required on success.
*/
static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer,
size_t bytes_per_buffer)
{
const struct EA_INFO *info;
struct EA_FULL *ea_all = NULL;
const struct EA_FULL *ea;
u32 off, size;
int err;
size_t ret;
err = ntfs_read_ea(ni, &ea_all, 0, &info);
if (err)
return err;
if (!info || !ea_all)
return 0;
size = le32_to_cpu(info->size);
/* Enumerate all xattrs */
for (ret = 0, off = 0; off < size; off += unpacked_ea_size(ea)) {
ea = Add2Ptr(ea_all, off);
if (buffer) {
if (ret + ea->name_len + 1 > bytes_per_buffer) {
err = -ERANGE;
goto out;
}
memcpy(buffer + ret, ea->name, ea->name_len);
buffer[ret + ea->name_len] = 0;
}
ret += ea->name_len + 1;
}
out:
ntfs_free(ea_all);
return err ? err : ret;
}
static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len,
void *buffer, size_t size, size_t *required)
{
struct ntfs_inode *ni = ntfs_i(inode);
const struct EA_INFO *info;
struct EA_FULL *ea_all = NULL;
const struct EA_FULL *ea;
u32 off, len;
int err;
if (!(ni->ni_flags & NI_FLAG_EA))
return -ENODATA;
if (!required)
ni_lock(ni);
len = 0;
if (name_len > 255) {
err = -ENAMETOOLONG;
goto out;
}
err = ntfs_read_ea(ni, &ea_all, 0, &info);
if (err)
goto out;
if (!info)
goto out;
/* Enumerate all xattrs */
if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off)) {
err = -ENODATA;
goto out;
}
ea = Add2Ptr(ea_all, off);
len = le16_to_cpu(ea->elength);
if (!buffer) {
err = 0;
goto out;
}
if (len > size) {
err = -ERANGE;
if (required)
*required = len;
goto out;
}
memcpy(buffer, ea->name + ea->name_len + 1, len);
err = 0;
out:
ntfs_free(ea_all);
if (!required)
ni_unlock(ni);
return err ? err : len;
}
static noinline int ntfs_set_ea(struct inode *inode, const char *name,
size_t name_len, const void *value,
size_t val_size, int flags, int locked)
{
struct ntfs_inode *ni = ntfs_i(inode);
struct ntfs_sb_info *sbi = ni->mi.sbi;
int err;
struct EA_INFO ea_info;
const struct EA_INFO *info;
struct EA_FULL *new_ea;
struct EA_FULL *ea_all = NULL;
size_t add, new_pack;
u32 off, size;
__le16 size_pack;
struct ATTRIB *attr;
struct ATTR_LIST_ENTRY *le;
struct mft_inode *mi;
struct runs_tree ea_run;
u64 new_sz;
void *p;
if (!locked)
ni_lock(ni);
run_init(&ea_run);
if (name_len > 255) {
err = -ENAMETOOLONG;
goto out;
}
add = DwordAlign(struct_size(ea_all, name, 1 + name_len + val_size));
err = ntfs_read_ea(ni, &ea_all, add, &info);
if (err)
goto out;
if (!info) {
memset(&ea_info, 0, sizeof(ea_info));
size = 0;
size_pack = 0;
} else {
memcpy(&ea_info, info, sizeof(ea_info));
size = le32_to_cpu(ea_info.size);
size_pack = ea_info.size_pack;
}
if (info && find_ea(ea_all, size, name, name_len, &off)) {
struct EA_FULL *ea;
size_t ea_sz;
if (flags & XATTR_CREATE) {
err = -EEXIST;
goto out;
}
/* Remove current xattr */
ea = Add2Ptr(ea_all, off);
if (ea->flags & FILE_NEED_EA)
le16_add_cpu(&ea_info.count, -1);
ea_sz = unpacked_ea_size(ea);
le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea));
memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz);
size -= ea_sz;
memset(Add2Ptr(ea_all, size), 0, ea_sz);
ea_info.size = cpu_to_le32(size);
if ((flags & XATTR_REPLACE) && !val_size)
goto update_ea;
} else {
if (flags & XATTR_REPLACE) {
err = -ENODATA;
goto out;
}
if (!ea_all) {
ea_all = ntfs_zalloc(add);
if (!ea_all) {
err = -ENOMEM;
goto out;
}
}
}
/* append new xattr */
new_ea = Add2Ptr(ea_all, size);
new_ea->size = cpu_to_le32(add);
new_ea->flags = 0;
new_ea->name_len = name_len;
new_ea->elength = cpu_to_le16(val_size);
memcpy(new_ea->name, name, name_len);
new_ea->name[name_len] = 0;
memcpy(new_ea->name + name_len + 1, value, val_size);
new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea);
/* should fit into 16 bits */
if (new_pack > 0xffff) {
err = -EFBIG; // -EINVAL?
goto out;
}
ea_info.size_pack = cpu_to_le16(new_pack);
/* new size of ATTR_EA */
size += add;
if (size > sbi->ea_max_size) {
err = -EFBIG; // -EINVAL?
goto out;
}
ea_info.size = cpu_to_le32(size);
update_ea:
if (!info) {
/* Create xattr */
if (!size) {
err = 0;
goto out;
}
err = ni_insert_resident(ni, sizeof(struct EA_INFO),
ATTR_EA_INFO, NULL, 0, NULL, NULL);
if (err)
goto out;
err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL);
if (err)
goto out;
}
new_sz = size;
err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz,
false, NULL);
if (err)
goto out;
le = NULL;
attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi);
if (!attr) {
err = -EINVAL;
goto out;
}
if (!size) {
/* delete xattr, ATTR_EA_INFO */
err = ni_remove_attr_le(ni, attr, le);
if (err)
goto out;
} else {
p = resident_data_ex(attr, sizeof(struct EA_INFO));
if (!p) {
err = -EINVAL;
goto out;
}
memcpy(p, &ea_info, sizeof(struct EA_INFO));
mi->dirty = true;
}
le = NULL;
attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi);
if (!attr) {
err = -EINVAL;
goto out;
}
if (!size) {
/* delete xattr, ATTR_EA */
err = ni_remove_attr_le(ni, attr, le);
if (err)
goto out;
} else if (attr->non_res) {
err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size);
if (err)
goto out;
} else {
p = resident_data_ex(attr, size);
if (!p) {
err = -EINVAL;
goto out;
}
memcpy(p, ea_all, size);
mi->dirty = true;
}
/* Check if we delete the last xattr */
if (size)
ni->ni_flags |= NI_FLAG_EA;
else
ni->ni_flags &= ~NI_FLAG_EA;
if (ea_info.size_pack != size_pack)
ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
mark_inode_dirty(&ni->vfs_inode);
out:
if (!locked)
ni_unlock(ni);
run_close(&ea_run);
ntfs_free(ea_all);
return err;
}
#ifdef CONFIG_NTFS3_FS_POSIX_ACL
static inline void ntfs_posix_acl_release(struct posix_acl *acl)
{
if (acl && refcount_dec_and_test(&acl->a_refcount))
kfree(acl);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
static struct posix_acl *ntfs_get_acl_ex(struct user_namespace *mnt_userns,
#else
static struct posix_acl *ntfs_get_acl_ex(
#endif
struct inode *inode, int type,
int locked)
{
struct ntfs_inode *ni = ntfs_i(inode);
const char *name;
size_t name_len;
struct posix_acl *acl;
size_t req;
int err;
void *buf;
/* allocate PATH_MAX bytes */
buf = __getname();
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;
}
if (!locked)
ni_lock(ni);
err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req);
if (!locked)
ni_unlock(ni);
/* Translate extended attribute to acl */
if (err > 0) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
acl = posix_acl_from_xattr(mnt_userns, buf, err);
#else
acl = posix_acl_from_xattr(&init_user_ns, buf, err);
#endif
if (!IS_ERR(acl))
set_cached_acl(inode, type, acl);
} else {
acl = err == -ENODATA ? NULL : ERR_PTR(err);
}
__putname(buf);
return acl;
}
/*
* ntfs_get_acl
*
* inode_operations::get_acl
*/
struct posix_acl *ntfs_get_acl(struct inode *inode, int type)
{
/* TODO: init_user_ns? */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
return ntfs_get_acl_ex(&init_user_ns, inode, type, 0);
#else
return ntfs_get_acl_ex(inode, type, 0);
#endif
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns,
#else
static noinline int ntfs_set_acl_ex(
#endif
struct inode *inode, struct posix_acl *acl,
int type, int locked)
{
const char *name;
size_t size, name_len;
void *value = NULL;
int err = 0;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
switch (type) {
case ACL_TYPE_ACCESS:
if (acl) {
umode_t mode = inode->i_mode;
err = posix_acl_equiv_mode(acl, &mode);
if (err < 0)
return err;
if (inode->i_mode != mode) {
inode->i_mode = mode;
mark_inode_dirty(inode);
}
if (!err) {
/*
* acl can be exactly represented in the
* traditional file mode permission bits
*/
acl = NULL;
goto out;
}
}
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)
goto out;
size = posix_acl_xattr_size(acl->a_count);
value = ntfs_malloc(size);
if (!value)
return -ENOMEM;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
err = posix_acl_to_xattr(mnt_userns, acl, value, size);
#else
err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
#endif
if (err)
goto out;
err = ntfs_set_ea(inode, name, name_len, value, size, 0, locked);
if (err)
goto out;
inode->i_flags &= ~S_NOSEC;
out:
if (!err)
set_cached_acl(inode, type, acl);
kfree(value);
return err;
}
/*
* ntfs_set_acl
*
* inode_operations::set_acl
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
#else
int ntfs_set_acl(struct inode *inode,
#endif
struct posix_acl *acl, int type)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
return ntfs_set_acl_ex(mnt_userns, inode, acl, type, 0);
#else
return ntfs_set_acl_ex(inode, acl, type, 0);
#endif
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
static int ntfs_xattr_get_acl(struct user_namespace *mnt_userns,
#else
static int ntfs_xattr_get_acl(
#endif
struct inode *inode, int type, void *buffer,
size_t size)
{
struct posix_acl *acl;
int err;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
if (!(inode->i_sb->s_flags & SB_POSIXACL))
#else
if (!(inode->i_sb->s_flags & MS_POSIXACL))
#endif
return -EOPNOTSUPP;
acl = ntfs_get_acl(inode, type);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (!acl)
return -ENODATA;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
err = posix_acl_to_xattr(mnt_userns, acl, buffer, size);
#else
err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
#endif
ntfs_posix_acl_release(acl);
return err;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
static int ntfs_xattr_set_acl(struct user_namespace *mnt_userns,
#else
static int ntfs_xattr_set_acl(
#endif
struct inode *inode, int type, const void *value,
size_t size)
{
struct posix_acl *acl;
int err;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
if (!(inode->i_sb->s_flags & SB_POSIXACL))
#else
if (!(inode->i_sb->s_flags & MS_POSIXACL))
#endif
return -EOPNOTSUPP;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
if (!inode_owner_or_capable(mnt_userns, inode))
#else
if (!inode_owner_or_capable(inode))
#endif
return -EPERM;
if (!value)
return 0;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
acl = posix_acl_from_xattr(mnt_userns, value, size);
#else
acl = posix_acl_from_xattr(&init_user_ns, value, size);
#endif
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
err = posix_acl_valid(mnt_userns, acl);
#else
err = posix_acl_valid(&init_user_ns, acl);
#endif
if (err)
goto release_and_out;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
err = ntfs_set_acl(mnt_userns, inode, acl, type);
#else
err = ntfs_set_acl(inode, acl, type);
#endif
release_and_out:
ntfs_posix_acl_release(acl);
return err;
}
/*
* Initialize the ACLs of a new inode. Called from ntfs_create_inode.
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode,
#else
int ntfs_init_acl(struct inode *inode,
#endif
struct inode *dir)
{
struct posix_acl *default_acl, *acl;
int err;
/*
* TODO refactoring lock
* ni_lock(dir) ... -> posix_acl_create(dir,...) -> ntfs_get_acl -> ni_lock(dir)
*/
inode->i_default_acl = NULL;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
default_acl = ntfs_get_acl_ex(mnt_userns, dir, ACL_TYPE_DEFAULT, 1);
#else
default_acl = ntfs_get_acl_ex(dir, ACL_TYPE_DEFAULT, 1);
#endif
if (!default_acl || default_acl == ERR_PTR(-EOPNOTSUPP)) {
inode->i_mode &= ~current_umask();
err = 0;
goto out;
}
if (IS_ERR(default_acl)) {
err = PTR_ERR(default_acl);
goto out;
}
acl = default_acl;
err = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
if (err < 0)
goto out1;
if (!err) {
posix_acl_release(acl);
acl = NULL;
}
if (!S_ISDIR(inode->i_mode)) {
posix_acl_release(default_acl);
default_acl = NULL;
}
if (default_acl)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
err = ntfs_set_acl_ex(mnt_userns, inode, default_acl,
#else
err = ntfs_set_acl_ex(inode, default_acl,
#endif
ACL_TYPE_DEFAULT, 1);
if (!acl)
inode->i_acl = NULL;
else if (!err)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
err = ntfs_set_acl_ex(mnt_userns, inode, acl, ACL_TYPE_ACCESS,
#else
err = ntfs_set_acl_ex(inode, acl, ACL_TYPE_ACCESS,
#endif
1);
posix_acl_release(acl);
out1:
posix_acl_release(default_acl);
out:
return err;
}
#endif
/*
* ntfs_acl_chmod
*
* helper for 'ntfs3_setattr'
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode)
#else
int ntfs_acl_chmod(struct inode *inode)
#endif
{
struct super_block *sb = inode->i_sb;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
if (!(sb->s_flags & SB_POSIXACL))
#else
if (!(sb->s_flags & MS_POSIXACL))
#endif
return 0;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
return posix_acl_chmod(mnt_userns, inode, inode->i_mode);
#else
return posix_acl_chmod(inode, inode->i_mode);
#endif
}
/*
* ntfs_permission
*
* inode_operations::permission
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
#else
int ntfs_permission(struct inode *inode,
#endif
int mask)
{
if (ntfs_sb(inode->i_sb)->options.no_acs_rules) {
/* "no access rules" mode - allow all changes */
return 0;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
return generic_permission(mnt_userns, inode, mask);
#else
return generic_permission(inode, mask);
#endif
}
/*
* ntfs_listxattr
*
* inode_operations::listxattr
*/
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);
ssize_t ret;
if (!(ni->ni_flags & NI_FLAG_EA)) {
/* no xattr in file */
return 0;
}
ni_lock(ni);
ret = ntfs_list_ea(ni, buffer, size);
ni_unlock(ni);
return ret;
}
static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de,
struct inode *inode, const char *name, void *buffer,
size_t size)
{
int err;
struct ntfs_inode *ni = ntfs_i(inode);
size_t name_len = strlen(name);
/* Dispatch request */
if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 &&
!memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) {
/* system.dos_attrib */
if (!buffer) {
err = sizeof(u8);
} else if (size < sizeof(u8)) {
err = -ENODATA;
} else {
err = sizeof(u8);
*(u8 *)buffer = le32_to_cpu(ni->std_fa);
}
goto out;
}
if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 &&
!memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) {
/* system.ntfs_attrib */
if (!buffer) {
err = sizeof(u32);
} else if (size < sizeof(u32)) {
err = -ENODATA;
} else {
err = sizeof(u32);
*(u32 *)buffer = le32_to_cpu(ni->std_fa);
}
goto out;
}
if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 &&
!memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) {
/* system.ntfs_security*/
struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL;
size_t sd_size = 0;
if (!is_ntfs3(ni->mi.sbi)) {
/* we should get nt4 security */
err = -EINVAL;
goto out;
} else if (le32_to_cpu(ni->std_security_id) <
SECURITY_ID_FIRST) {
err = -ENOENT;
goto out;
}
err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id,
&sd, &sd_size);
if (err)
goto out;
if (!is_sd_valid(sd, sd_size)) {
ntfs_inode_warn(
inode,
"looks like you get incorrect security descriptor id=%u",
ni->std_security_id);
}
if (!buffer) {
err = sd_size;
} else if (size < sd_size) {
err = -ENODATA;
} else {
err = sd_size;
memcpy(buffer, sd, sd_size);
}
ntfs_free(sd);
goto out;
}
#ifdef CONFIG_NTFS3_FS_POSIX_ACL
if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 &&
!memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) ||
(name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 &&
!memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) {
/* TODO: init_user_ns? */
err = ntfs_xattr_get_acl(
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
&init_user_ns, inode,
#else
inode,
#endif
name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
? ACL_TYPE_ACCESS
: ACL_TYPE_DEFAULT,
buffer, size);
goto out;
}
#endif
/* deal with ntfs extended attribute */
err = ntfs_get_ea(inode, name, name_len, buffer, size, NULL);
out: