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/smp_lock.h>
13 #include <linux/ext2_fs.h>
14 #include "xattr.h"
15
16 #define XATTR_TRUSTED_PREFIX "trusted."
17
18 static size_t
19 ext2_xattr_trusted_list(struct inode *inode, char *list, size_t list_size,
20 const char *name, size_t name_len)
21 {
22 const int prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1;
23 const size_t total_len = prefix_len + name_len + 1;
24
25 if (!capable(CAP_SYS_ADMIN))
26 return 0;
27
28 if (list && total_len <= list_size) {
29 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
30 memcpy(list+prefix_len, name, name_len);
31 list[prefix_len + name_len] = '\0';
32 }
33 return total_len;
34 }
35
36 static int
37 ext2_xattr_trusted_get(struct inode *inode, const char *name,
38 void *buffer, size_t size)
39 {
40 if (strcmp(name, "") == 0)
41 return -EINVAL;
42 return ext2_xattr_get(inode, EXT2_XATTR_INDEX_TRUSTED, name,
43 buffer, size);
44 }
45
46 static int
47 ext2_xattr_trusted_set(struct inode *inode, const char *name,
48 const void *value, size_t size, int flags)
49 {
50 if (strcmp(name, "") == 0)
51 return -EINVAL;
52 return ext2_xattr_set(inode, EXT2_XATTR_INDEX_TRUSTED, name,
53 value, size, flags);
54 }
55
56 struct xattr_handler ext2_xattr_trusted_handler = {
57 .prefix = XATTR_TRUSTED_PREFIX,
58 .list = ext2_xattr_trusted_list,
59 .get = ext2_xattr_trusted_get,
60 .set = ext2_xattr_trusted_set,
61 };
62
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