linux/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 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 = kmalloc(size + add_bytes, GFP_NOFS);
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:
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, 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;
}
fs/ntfs3: Use kernel ALIGN macros over driver specific The static checkers (Smatch) were complaining because QuadAlign() was buggy. If you try to align something higher than UINT_MAX it got truncated to a u32. Smatch warning was: fs/ntfs3/attrib.c:383 attr_set_size_res() warn: was expecting a 64 bit value instead of '~7' So that this will not happen again we will change all these macros to kernel made ones. This can also help some other static analyzing tools to give us better warnings. Patch was generated with Coccinelle script and after that some style issue was hand fixed. Coccinelle script: virtual patch @alloc depends on patch@ expression x; @@ ( - #define QuadAlign(n) (((n) + 7u) & (~7u)) | - QuadAlign(x) + ALIGN(x, 8) | - #define IsQuadAligned(n) (!((size_t)(n)&7u)) | - IsQuadAligned(x) + IS_ALIGNED(x, 8) | - #define Quad2Align(n) (((n) + 15u) & (~15u)) | - Quad2Align(x) + ALIGN(x, 16) | - #define IsQuad2Aligned(n) (!((size_t)(n)&15u)) | - IsQuad2Aligned(x) + IS_ALIGNED(x, 16) | - #define Quad4Align(n) (((n) + 31u) & (~31u)) | - Quad4Align(x) + ALIGN(x, 32) | - #define IsSizeTAligned(n) (!((size_t)(n) & (sizeof(size_t) - 1))) | - IsSizeTAligned(x) + IS_ALIGNED(x, sizeof(size_t)) | - #define DwordAlign(n) (((n) + 3u) & (~3u)) | - DwordAlign(x) + ALIGN(x, 4) | - #define IsDwordAligned(n) (!((size_t)(n)&3u)) | - IsDwordAligned(x) + IS_ALIGNED(x, 4) | - #define WordAlign(n) (((n) + 1u) & (~1u)) | - WordAlign(x) + ALIGN(x, 2) | - #define IsWordAligned(n) (!((size_t)(n)&1u)) | - IsWordAligned(x) + IS_ALIGNED(x, 2) | ) Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Kari Argillander <kari.argillander@gmail.com> Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
2021-08-26 08:56:29 +00:00
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);
/* 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,
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 = 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 inline void ntfs_posix_acl_release(struct posix_acl *acl)
{
if (acl && refcount_dec_and_test(&acl->a_refcount))
kfree(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);
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? */
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, 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;
}
}
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) {
size = 0;
value = NULL;
} 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;
}
err = ntfs_set_ea(inode, name, name_len, value, size, 0, locked);
if (!err)
set_cached_acl(inode, type, acl);
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, 0);
}
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);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (!acl)
return -ENODATA;
err = posix_acl_to_xattr(mnt_userns, acl, buffer, size);
ntfs_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:
ntfs_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;
/*
* TODO: Refactoring lock.
* ni_lock(dir) ... -> posix_acl_create(dir,...) -> ntfs_get_acl -> ni_lock(dir)
*/
inode->i_default_acl = NULL;
default_acl = ntfs_get_acl_ex(mnt_userns, dir, ACL_TYPE_DEFAULT, 1);
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)
err = ntfs_set_acl_ex(mnt_userns, inode, default_acl,
ACL_TYPE_DEFAULT, 1);
if (!acl)
inode->i_acl = NULL;
else if (!err)
err = ntfs_set_acl_ex(mnt_userns, inode, acl, ACL_TYPE_ACCESS,
1);
posix_acl_release(acl);
out1:
posix_acl_release(default_acl);
out:
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:
return err;
}
/*
* ntfs_save_wsl_perm
*
* save uid/gid/mode in xattr
*/
int ntfs_save_wsl_perm(struct inode *inode)
{
int err;
__le32 value;
value = cpu_to_le32(i_uid_read(inode));
err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value,
sizeof(value), 0, 0);
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, 0);
if (err)
goto out;
value = cpu_to_le32(inode->i_mode);
err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value,
sizeof(value), 0, 0);
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, 0);
if (err)
goto out;
}
out:
/* 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