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-rw-r--r--fs/ntfs3/xattr.c1122
1 files changed, 1122 insertions, 0 deletions
diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
new file mode 100644
index 000000000000..7282d85c4ece
--- /dev/null
+++ b/fs/ntfs3/xattr.c
@@ -0,0 +1,1122 @@
+// 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)
+ : 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;
+ }
+
+ 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);
+ 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, 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, 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, false);
+ 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.no_acs_rules) {
+ /* "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