blob: 83ee149f353db383d657e01a5feb8cd0fac82655 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080010#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/ext2_fs.h>
13#include "xattr.h"
14
15#define XATTR_TRUSTED_PREFIX "trusted."
16
17static size_t
18ext2_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
35static int
36ext2_xattr_trusted_get(struct inode *inode, const char *name,
37 void *buffer, size_t size)
38{
39 if (strcmp(name, "") == 0)
40 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 return ext2_xattr_get(inode, EXT2_XATTR_INDEX_TRUSTED, name,
42 buffer, size);
43}
44
45static int
46ext2_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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 return ext2_xattr_set(inode, EXT2_XATTR_INDEX_TRUSTED, name,
52 value, size, flags);
53}
54
55struct 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};