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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 inode *inode, char *list, size_t list_size, |
17 | const char *name, size_t name_len) |
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 inode *inode, const char *name, |
35 | void *buffer, size_t size) |
36 | { |
37 | if (strcmp(name, "") == 0) |
38 | return -EINVAL; |
39 | return ext2_xattr_get(inode, EXT2_XATTR_INDEX_TRUSTED, name, |
40 | buffer, size); |
41 | } |
42 | |
43 | static int |
44 | ext2_xattr_trusted_set(struct inode *inode, const char *name, |
45 | const void *value, size_t size, int flags) |
46 | { |
47 | if (strcmp(name, "") == 0) |
48 | return -EINVAL; |
49 | return ext2_xattr_set(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 | }; |
59 |
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