1 /*
2 * linux/fs/ext3/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/ext3_jbd.h>
14 #include <linux/ext3_fs.h>
15 #include "xattr.h"
16
17 #define XATTR_TRUSTED_PREFIX "trusted."
18
19 static size_t
20 ext3_xattr_trusted_list(struct inode *inode, char *list, size_t list_size,
21 const char *name, size_t name_len)
22 {
23 const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1;
24 const size_t total_len = prefix_len + name_len + 1;
25
26 if (!capable(CAP_SYS_ADMIN))
27 return 0;
28
29 if (list && total_len <= list_size) {
30 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
31 memcpy(list+prefix_len, name, name_len);
32 list[prefix_len + name_len] = '\0';
33 }
34 return total_len;
35 }
36
37 static int
38 ext3_xattr_trusted_get(struct inode *inode, const char *name,
39 void *buffer, size_t size)
40 {
41 if (strcmp(name, "") == 0)
42 return -EINVAL;
43 return ext3_xattr_get(inode, EXT3_XATTR_INDEX_TRUSTED, name,
44 buffer, size);
45 }
46
47 static int
48 ext3_xattr_trusted_set(struct inode *inode, const char *name,
49 const void *value, size_t size, int flags)
50 {
51 if (strcmp(name, "") == 0)
52 return -EINVAL;
53 return ext3_xattr_set(inode, EXT3_XATTR_INDEX_TRUSTED, name,
54 value, size, flags);
55 }
56
57 struct xattr_handler ext3_xattr_trusted_handler = {
58 .prefix = XATTR_TRUSTED_PREFIX,
59 .list = ext3_xattr_trusted_list,
60 .get = ext3_xattr_trusted_get,
61 .set = ext3_xattr_trusted_set,
62 };
63
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