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Commit | Line | Data |
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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 | ||
1da177e4 | 8 | #include <linux/string.h> |
16f7e0fe | 9 | #include <linux/capability.h> |
1da177e4 | 10 | #include <linux/fs.h> |
1da177e4 LT |
11 | #include <linux/ext2_fs.h> |
12 | #include "xattr.h" | |
13 | ||
1da177e4 | 14 | static size_t |
431547b3 CH |
15 | ext2_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size, |
16 | const char *name, size_t name_len, int type) | |
1da177e4 | 17 | { |
f905f06f | 18 | const int prefix_len = XATTR_TRUSTED_PREFIX_LEN; |
1da177e4 LT |
19 | const size_t total_len = prefix_len + name_len + 1; |
20 | ||
21 | if (!capable(CAP_SYS_ADMIN)) | |
22 | return 0; | |
23 | ||
24 | if (list && total_len <= list_size) { | |
25 | memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); | |
26 | memcpy(list+prefix_len, name, name_len); | |
27 | list[prefix_len + name_len] = '\0'; | |
28 | } | |
29 | return total_len; | |
30 | } | |
31 | ||
32 | static int | |
431547b3 CH |
33 | ext2_xattr_trusted_get(struct dentry *dentry, const char *name, |
34 | void *buffer, size_t size, int type) | |
1da177e4 LT |
35 | { |
36 | if (strcmp(name, "") == 0) | |
37 | return -EINVAL; | |
431547b3 | 38 | return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name, |
1da177e4 LT |
39 | buffer, size); |
40 | } | |
41 | ||
42 | static int | |
431547b3 CH |
43 | ext2_xattr_trusted_set(struct dentry *dentry, const char *name, |
44 | const void *value, size_t size, int flags, int type) | |
1da177e4 LT |
45 | { |
46 | if (strcmp(name, "") == 0) | |
47 | return -EINVAL; | |
431547b3 | 48 | return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name, |
1da177e4 LT |
49 | value, size, flags); |
50 | } | |
51 | ||
749c72ef | 52 | const struct xattr_handler ext2_xattr_trusted_handler = { |
1da177e4 LT |
53 | .prefix = XATTR_TRUSTED_PREFIX, |
54 | .list = ext2_xattr_trusted_list, | |
55 | .get = ext2_xattr_trusted_get, | |
56 | .set = ext2_xattr_trusted_set, | |
57 | }; |