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OpenCloudOS-Kernel/fs/ntfs3/xattr.c

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// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
*
*/
#include <linux/fs.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)
: ALIGN(struct_size(ea, name,
1 + ea->name_len +
le16_to_cpu(ea->elength)),
4);
}
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 - Read 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 ntfs_sb_info *sbi = ni->mi.sbi;
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 > sbi->ea_max_size)
return -EFBIG;
if (attr_size(attr_ea) > sbi->ea_max_size)
return -EFBIG;
/* Allocate memory for packed Ea. */
ea_p = kmalloc(size + add_bytes, GFP_NOFS);
if (!ea_p)
return -ENOMEM;
if (!size) {
/* EA info persists, but xattr is empty. Looks like EA problem. */
} else if (attr_ea->non_res) {
struct runs_tree run;
run_init(&run);
err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &run, 0, size);
if (!err)
err = ntfs_read_run_nb(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:
kfree(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.
*
* Return:
* * Number of bytes used / required on
* * -ERRNO - on failure
*/
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:
kfree(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:
kfree(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, bool 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 = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4);
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;
}
ea = Add2Ptr(ea_all, off);
/*
* Check simple case when we try to insert xattr with the same value
* e.g. ntfs_save_wsl_perm
*/
if (val_size && le16_to_cpu(ea->elength) == val_size &&
!memcmp(ea->name + ea->name_len + 1, value, val_size)) {
/* xattr already contains the required value. */
goto out;
}
/* Remove current xattr. */
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) {
/* Remove xattr. */
goto update_ea;
}
} else {
if (flags & XATTR_REPLACE) {
err = -ENODATA;
goto out;
}
if (!ea_all) {
ea_all = kzalloc(add, GFP_NOFS);
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);
ea_info.size_pack = cpu_to_le16(new_pack);
/* New size of ATTR_EA. */
size += add;
ea_info.size = cpu_to_le32(size);
/*
* 1. Check ea_info.size_pack for overflow.
* 2. New attibute size must fit value from $AttrDef
*/
if (new_pack > 0xffff || size > sbi->ea_max_size) {
ntfs_inode_warn(
inode,
"The size of extended attributes must not exceed 64KiB");
err = -EFBIG; // -EINVAL?
goto out;
}
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,
NULL);
if (err)
goto out;
err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, 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 */
ni_remove_attr_le(ni, attr, mi, le);
} 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 */
ni_remove_attr_le(ni, attr, mi, le);
} else if (attr->non_res) {
err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0,
size);
if (err)
goto out;
err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0);
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);
kfree(ea_all);
return err;
}
#ifdef CONFIG_NTFS3_FS_POSIX_ACL
static struct posix_acl *ntfs_get_acl_ex(struct user_namespace *mnt_userns,
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) {
acl = posix_acl_from_xattr(mnt_userns, buf, err);
} else if (err == -ENODATA) {
acl = NULL;
} else {
acl = ERR_PTR(err);
}
if (!IS_ERR(acl))
set_cached_acl(inode, type, acl);
__putname(buf);
return acl;
}
/*
* ntfs_get_acl - inode_operations::get_acl
*/
struct posix_acl *ntfs_get_acl(struct inode *inode, int type, bool rcu)
{
if (rcu)
return ERR_PTR(-ECHILD);
/* TODO: init_user_ns? */
return ntfs_get_acl_ex(&init_user_ns, inode, type, 0);
}
static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns,
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(mnt_userns, 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 {
size = posix_acl_xattr_size(acl->a_count);
value = kmalloc(size, GFP_NOFS);
if (!value)
return -ENOMEM;
err = posix_acl_to_xattr(mnt_userns, acl, value, size);
if (err < 0)
goto out;
flags = 0;
}
err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0);
if (err == -ENODATA && !size)
err = 0; /* Removing non existed xattr. */
if (!err) {
set_cached_acl(inode, type, acl);
if (inode->i_mode != mode) {
inode->i_mode = mode;
mark_inode_dirty(inode);
}
}
out:
kfree(value);
return err;
}
/*
* ntfs_set_acl - inode_operations::set_acl
*/
int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type)
{
return ntfs_set_acl_ex(mnt_userns, inode, acl, type, false);
}
static int ntfs_xattr_get_acl(struct user_namespace *mnt_userns,
struct inode *inode, int type, void *buffer,
size_t size)
{
struct posix_acl *acl;
int err;
if (!(inode->i_sb->s_flags & SB_POSIXACL)) {
ntfs_inode_warn(inode, "add mount option \"acl\" to use acl");
return -EOPNOTSUPP;
}
acl = ntfs_get_acl(inode, type, false);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (!acl)
return -ENODATA;
err = posix_acl_to_xattr(mnt_userns, acl, buffer, size);
posix_acl_release(acl);
return err;
}
static int ntfs_xattr_set_acl(struct user_namespace *mnt_userns,
struct inode *inode, int type, const void *value,
size_t size)
{
struct posix_acl *acl;
int err;
if (!(inode->i_sb->s_flags & SB_POSIXACL)) {
ntfs_inode_warn(inode, "add mount option \"acl\" to use acl");
return -EOPNOTSUPP;
}
if (!inode_owner_or_capable(mnt_userns, inode))
return -EPERM;
if (!value) {
acl = NULL;
} else {
acl = posix_acl_from_xattr(mnt_userns, value, size);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl) {
err = posix_acl_valid(mnt_userns, acl);
if (err)
goto release_and_out;
}
}
err = ntfs_set_acl(mnt_userns, inode, acl, type);
release_and_out:
posix_acl_release(acl);
return err;
}
/*
* ntfs_init_acl - Initialize the ACLs of a new inode.
*
* Called from ntfs_create_inode().
*/
int ntfs_init_acl(struct user_namespace *mnt_userns, 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(mnt_userns, 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(mnt_userns, inode, acl,
ACL_TYPE_ACCESS, true);
posix_acl_release(acl);
} else {
inode->i_acl = NULL;
}
return err;
}
#endif
/*
* ntfs_acl_chmod - Helper for ntfs3_setattr().
*/
int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode)
{
struct super_block *sb = inode->i_sb;
if (!(sb->s_flags & SB_POSIXACL))
return 0;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
return posix_acl_chmod(mnt_userns, inode, inode->i_mode);
}
/*
* ntfs_permission - inode_operations::permission
*/
int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
int mask)
{
if (ntfs_sb(inode->i_sb)->options->noacsrules) {
/* "No access rules" mode - Allow all changes. */
return 0;
}
return generic_permission(mnt_userns, inode, mask);
}
/*
* 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);
}
kfree(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(
&init_user_ns, inode,
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:
return err;
}
/*
* ntfs_setxattr - inode_operations::setxattr
*/
static noinline int ntfs_setxattr(const struct xattr_handler *handler,
struct user_namespace *mnt_userns,
struct dentry *de, struct inode *inode,
const char *name, const void *value,
size_t size, int flags)
{
int err = -EINVAL;
struct ntfs_inode *ni = ntfs_i(inode);
size_t name_len = strlen(name);
enum FILE_ATTRIBUTE new_fa;
/* Dispatch request. */
if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 &&
!memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) {
if (sizeof(u8) != size)
goto out;
new_fa = cpu_to_le32(*(u8 *)value);
goto set_new_fa;
}
if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 &&
!memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) {
if (size != sizeof(u32))
goto out;
new_fa = cpu_to_le32(*(u32 *)value);
if (S_ISREG(inode->i_mode)) {
/* Process compressed/sparsed in special way. */
ni_lock(ni);
err = ni_new_attr_flags(ni, new_fa);
ni_unlock(ni);
if (err)
goto out;
}
set_new_fa:
/*
* Thanks Mark Harmstone:
* Keep directory bit consistency.
*/
if (S_ISDIR(inode->i_mode))
new_fa |= FILE_ATTRIBUTE_DIRECTORY;
else
new_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
if (ni->std_fa != new_fa) {
ni->std_fa = new_fa;
if (new_fa & FILE_ATTRIBUTE_READONLY)
inode->i_mode &= ~0222;
else
inode->i_mode |= 0222;
/* Std attribute always in primary record. */
ni->mi.dirty = true;
mark_inode_dirty(inode);
}
err = 0;
goto out;
}
if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 &&
!memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) {
/* system.ntfs_security*/
__le32 security_id;
bool inserted;
struct ATTR_STD_INFO5 *std;
if (!is_ntfs3(ni->mi.sbi)) {
/*
* We should replace ATTR_SECURE.
* Skip this way cause it is nt4 feature.
*/
err = -EINVAL;
goto out;
}
if (!is_sd_valid(value, size)) {
err = -EINVAL;
ntfs_inode_warn(
inode,
"you try to set invalid security descriptor");
goto out;
}
err = ntfs_insert_security(ni->mi.sbi, value, size,
&security_id, &inserted);
if (err)
goto out;
ni_lock(ni);
std = ni_std5(ni);
if (!std) {
err = -EINVAL;
} else if (std->security_id != security_id) {
std->security_id = ni->std_security_id = security_id;
/* Std attribute always in primary record. */
ni->mi.dirty = true;
mark_inode_dirty(&ni->vfs_inode);
}
ni_unlock(ni);
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)))) {
err = ntfs_xattr_set_acl(
mnt_userns, inode,
name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
? ACL_TYPE_ACCESS
: ACL_TYPE_DEFAULT,
value, size);
goto out;
}
#endif
/* Deal with NTFS extended attribute. */
err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0);
out:
inode->i_ctime = current_time(inode);
mark_inode_dirty(inode);
return err;
}
/*
* ntfs_save_wsl_perm
*
* save uid/gid/mode in xattr
*/
int ntfs_save_wsl_perm(struct inode *inode)
{
int err;
__le32 value;
struct ntfs_inode *ni = ntfs_i(inode);
ni_lock(ni);
value = cpu_to_le32(i_uid_read(inode));
err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value,
sizeof(value), 0, true); /* true == already locked. */
if (err)
goto out;
value = cpu_to_le32(i_gid_read(inode));
err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value,
sizeof(value), 0, true);
if (err)
goto out;
value = cpu_to_le32(inode->i_mode);
err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value,
sizeof(value), 0, true);
if (err)
goto out;
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
value = cpu_to_le32(inode->i_rdev);
err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value,
sizeof(value), 0, true);
if (err)
goto out;
}
out:
ni_unlock(ni);
/* In case of error should we delete all WSL xattr? */
return err;
}
/*
* ntfs_get_wsl_perm
*
* get uid/gid/mode from xattr
* it is called from ntfs_iget5->ntfs_read_mft
*/
void ntfs_get_wsl_perm(struct inode *inode)
{
size_t sz;
__le32 value[3];
if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0],
sizeof(value[0]), &sz) == sizeof(value[0]) &&
ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1],
sizeof(value[1]), &sz) == sizeof(value[1]) &&
ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2],
sizeof(value[2]), &sz) == sizeof(value[2])) {
i_uid_write(inode, (uid_t)le32_to_cpu(value[0]));
i_gid_write(inode, (gid_t)le32_to_cpu(value[1]));
inode->i_mode = le32_to_cpu(value[2]);
if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1,
&value[0], sizeof(value),
&sz) == sizeof(value[0])) {
inode->i_rdev = le32_to_cpu(value[0]);
}
}
}
static bool ntfs_xattr_user_list(struct dentry *dentry)
{
return true;
}
// clang-format off
static const struct xattr_handler ntfs_xattr_handler = {
.prefix = "",
.get = ntfs_getxattr,
.set = ntfs_setxattr,
.list = ntfs_xattr_user_list,
};
const struct xattr_handler *ntfs_xattr_handlers[] = {
&ntfs_xattr_handler,
NULL,
};
// clang-format on
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