Line data Source code
1 : /*
2 : * linux/fs/ext2/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 <linux/ext2_fs.h>
13 : #include "xattr.h"
14 :
15 : static size_t
16 : ext2_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
17 : const char *name, size_t name_len, int type)
18 : {
19 2 : const int prefix_len = XATTR_TRUSTED_PREFIX_LEN;
20 2 : const size_t total_len = prefix_len + name_len + 1;
21 1 :
22 3 : if (!capable(CAP_SYS_ADMIN))
23 1 : return 0;
24 :
25 4 : if (list && total_len <= list_size) {
26 1 : memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
27 1 : memcpy(list+prefix_len, name, name_len);
28 1 : list[prefix_len + name_len] = '\0';
29 : }
30 1 : return total_len;
31 : }
32 :
33 : static int
34 : ext2_xattr_trusted_get(struct dentry *dentry, const char *name,
35 : void *buffer, size_t size, int type)
36 : {
37 4 : if (strcmp(name, "") == 0)
38 2 : return -EINVAL;
39 4 : return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
40 : buffer, size);
41 : }
42 :
43 : static int
44 : ext2_xattr_trusted_set(struct dentry *dentry, const char *name,
45 : const void *value, size_t size, int flags, int type)
46 : {
47 4 : if (strcmp(name, "") == 0)
48 2 : return -EINVAL;
49 4 : return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
50 : value, size, flags);
51 : }
52 :
53 1 : struct xattr_handler ext2_xattr_trusted_handler = {
54 : .prefix = XATTR_TRUSTED_PREFIX,
55 : .list = ext2_xattr_trusted_list,
56 : .get = ext2_xattr_trusted_get,
57 : .set = ext2_xattr_trusted_set,
58 : };
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