blob: dc8edda9ffe0e1247c3e10c8e2960a81f911f823 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
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/ext3_jbd.h>
13#include <linux/ext3_fs.h>
14#include "xattr.h"
15
Linus Torvalds1da177e2005-04-16 15:20:36 -070016static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000017ext3_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
18 const char *name, size_t name_len, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070019{
Shen Fengef1afd32008-07-25 01:46:23 -070020 const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 const size_t total_len = prefix_len + name_len + 1;
22
23 if (!capable(CAP_SYS_ADMIN))
24 return 0;
25
26 if (list && total_len <= list_size) {
27 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
28 memcpy(list+prefix_len, name, name_len);
29 list[prefix_len + name_len] = '\0';
30 }
31 return total_len;
32}
33
34static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000035ext3_xattr_trusted_get(struct dentry *dentry, const char *name,
36 void *buffer, size_t size, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
38 if (strcmp(name, "") == 0)
39 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000040 return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_TRUSTED,
41 name, buffer, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042}
43
44static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000045ext3_xattr_trusted_set(struct dentry *dentry, const char *name,
46 const void *value, size_t size, int flags, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
48 if (strcmp(name, "") == 0)
49 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000050 return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_TRUSTED, name,
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 value, size, flags);
52}
53
Stephen Hemmingerd1f21042010-05-13 17:53:17 -070054const struct xattr_handler ext3_xattr_trusted_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 .prefix = XATTR_TRUSTED_PREFIX,
56 .list = ext3_xattr_trusted_list,
57 .get = ext3_xattr_trusted_get,
58 .set = ext3_xattr_trusted_set,
59};