blob: 2989467d3595c0ff8a8349863910bff43a073273 [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
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/string.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -08009#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/ext2_fs.h>
12#include "xattr.h"
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000015ext2_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
16 const char *name, size_t name_len, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070017{
Shen Fengf905f062008-07-25 01:46:15 -070018 const int prefix_len = XATTR_TRUSTED_PREFIX_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 const size_t total_len = prefix_len + name_len + 1;
20
21 if (!capable(CAP_SYS_ADMIN))
22 return 0;
23
24 if (list && total_len <= list_size) {
25 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
26 memcpy(list+prefix_len, name, name_len);
27 list[prefix_len + name_len] = '\0';
28 }
29 return total_len;
30}
31
32static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000033ext2_xattr_trusted_get(struct dentry *dentry, const char *name,
34 void *buffer, size_t size, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035{
36 if (strcmp(name, "") == 0)
37 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000038 return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 buffer, size);
40}
41
42static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000043ext2_xattr_trusted_set(struct dentry *dentry, const char *name,
44 const void *value, size_t size, int flags, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
46 if (strcmp(name, "") == 0)
47 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000048 return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 value, size, flags);
50}
51
Stephen Hemminger749c72ef2010-05-13 17:53:16 -070052const struct xattr_handler ext2_xattr_trusted_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 .prefix = XATTR_TRUSTED_PREFIX,
54 .list = ext2_xattr_trusted_list,
55 .get = ext2_xattr_trusted_get,
56 .set = ext2_xattr_trusted_set,
57};