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ac27a0ec DK |
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 | }; |