1/*
 2 * linux/fs/ext4/xattr_trusted.c
 3 * Handler for trusted extended attributes.
 4 *
 5 * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
 6 */
 7
 8#include <linux/module.h>
 9#include <linux/string.h>
10#include <linux/capability.h>
11#include <linux/fs.h>
12#include "ext4_jbd2.h"
13#include "ext4.h"
14#include "xattr.h"
15
16static size_t
17ext4_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
18		const char *name, size_t name_len, int type)
19{
20	const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
21	const size_t total_len = prefix_len + name_len + 1;
22
23	if (!capable(CAP_SYS_ADMIN))
24		return 0;
25
26	if (list && total_len <= list_size) {
27		memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
28		memcpy(list+prefix_len, name, name_len);
29		list[prefix_len + name_len] = '\0';
30	}
31	return total_len;
32}
33
34static int
35ext4_xattr_trusted_get(struct dentry *dentry, const char *name, void *buffer,
36		size_t size, int type)
 
37{
38	if (strcmp(name, "") == 0)
39		return -EINVAL;
40	return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_TRUSTED,
41			      name, buffer, size);
42}
43
44static int
45ext4_xattr_trusted_set(struct dentry *dentry, const char *name,
46		const void *value, size_t size, int flags, int type)
 
 
 
47{
48	if (strcmp(name, "") == 0)
49		return -EINVAL;
50	return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_TRUSTED,
51			      name, value, size, flags);
52}
53
54const struct xattr_handler ext4_xattr_trusted_handler = {
55	.prefix	= XATTR_TRUSTED_PREFIX,
56	.list	= ext4_xattr_trusted_list,
57	.get	= ext4_xattr_trusted_get,
58	.set	= ext4_xattr_trusted_set,
59};

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * linux/fs/ext4/xattr_trusted.c
 4 * Handler for trusted extended attributes.
 5 *
 6 * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
 7 */
 8
 
 9#include <linux/string.h>
10#include <linux/capability.h>
11#include <linux/fs.h>
12#include "ext4_jbd2.h"
13#include "ext4.h"
14#include "xattr.h"
15
16static bool
17ext4_xattr_trusted_list(struct dentry *dentry)
 
18{
19	return capable(CAP_SYS_ADMIN);
 
 
 
 
 
 
 
 
 
 
 
20}
21
22static int
23ext4_xattr_trusted_get(const struct xattr_handler *handler,
24		       struct dentry *unused, struct inode *inode,
25		       const char *name, void *buffer, size_t size)
26{
27	return ext4_xattr_get(inode, EXT4_XATTR_INDEX_TRUSTED,
 
 
28			      name, buffer, size);
29}
30
31static int
32ext4_xattr_trusted_set(const struct xattr_handler *handler,
33		       struct mnt_idmap *idmap,
34		       struct dentry *unused, struct inode *inode,
35		       const char *name, const void *value,
36		       size_t size, int flags)
37{
38	return ext4_xattr_set(inode, EXT4_XATTR_INDEX_TRUSTED,
 
 
39			      name, value, size, flags);
40}
41
42const struct xattr_handler ext4_xattr_trusted_handler = {
43	.prefix	= XATTR_TRUSTED_PREFIX,
44	.list	= ext4_xattr_trusted_list,
45	.get	= ext4_xattr_trusted_get,
46	.set	= ext4_xattr_trusted_set,
47};