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Commit | Line | Data |
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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 | const int prefix_len = XATTR_TRUSTED_PREFIX_LEN; | |
20 | const size_t total_len = prefix_len + name_len + 1; | |
21 | ||
22 | if (!capable(CAP_SYS_ADMIN)) | |
23 | return 0; | |
24 | ||
25 | if (list && total_len <= list_size) { | |
26 | memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); | |
27 | memcpy(list+prefix_len, name, name_len); | |
28 | list[prefix_len + name_len] = '\0'; | |
29 | } | |
30 | 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 | if (strcmp(name, "") == 0) | |
38 | return -EINVAL; | |
39 | 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 | if (strcmp(name, "") == 0) | |
48 | return -EINVAL; | |
49 | return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name, | |
50 | value, size, flags); | |
51 | } | |
52 | ||
53 | 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 | }; |