Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
16f7e0fe | 10 | #include <linux/capability.h> |
1da177e4 | 11 | #include <linux/fs.h> |
1da177e4 LT |
12 | #include <linux/ext2_fs.h> |
13 | #include "xattr.h" | |
14 | ||
15 | #define XATTR_TRUSTED_PREFIX "trusted." | |
16 | ||
17 | static size_t | |
18 | ext2_xattr_trusted_list(struct inode *inode, char *list, size_t list_size, | |
19 | const char *name, size_t name_len) | |
20 | { | |
21 | const int prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1; | |
22 | const size_t total_len = prefix_len + name_len + 1; | |
23 | ||
24 | if (!capable(CAP_SYS_ADMIN)) | |
25 | return 0; | |
26 | ||
27 | if (list && total_len <= list_size) { | |
28 | memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); | |
29 | memcpy(list+prefix_len, name, name_len); | |
30 | list[prefix_len + name_len] = '\0'; | |
31 | } | |
32 | return total_len; | |
33 | } | |
34 | ||
35 | static int | |
36 | ext2_xattr_trusted_get(struct inode *inode, const char *name, | |
37 | void *buffer, size_t size) | |
38 | { | |
39 | if (strcmp(name, "") == 0) | |
40 | return -EINVAL; | |
1da177e4 LT |
41 | return ext2_xattr_get(inode, EXT2_XATTR_INDEX_TRUSTED, name, |
42 | buffer, size); | |
43 | } | |
44 | ||
45 | static int | |
46 | ext2_xattr_trusted_set(struct inode *inode, const char *name, | |
47 | const void *value, size_t size, int flags) | |
48 | { | |
49 | if (strcmp(name, "") == 0) | |
50 | return -EINVAL; | |
1da177e4 LT |
51 | return ext2_xattr_set(inode, EXT2_XATTR_INDEX_TRUSTED, name, |
52 | value, size, flags); | |
53 | } | |
54 | ||
55 | struct xattr_handler ext2_xattr_trusted_handler = { | |
56 | .prefix = XATTR_TRUSTED_PREFIX, | |
57 | .list = ext2_xattr_trusted_list, | |
58 | .get = ext2_xattr_trusted_get, | |
59 | .set = ext2_xattr_trusted_set, | |
60 | }; |