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Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/fs/ext4/xattr_trusted.c
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 * 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>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040012#include "ext4_jbd2.h"
13#include "ext4.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070014#include "xattr.h"
15
Dave Kleikampac27a0e2006-10-11 01:20:50 -070016static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000017ext4_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
18 const char *name, size_t name_len, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070019{
Shen Feng35375762008-07-11 19:27:31 -040020 const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
Dave Kleikampac27a0e2006-10-11 01:20:50 -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 +000035ext4_xattr_trusted_get(struct dentry *dentry, const char *name, void *buffer,
36 size_t size, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070037{
38 if (strcmp(name, "") == 0)
39 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000040 return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_TRUSTED,
41 name, buffer, size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070042}
43
44static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000045ext4_xattr_trusted_set(struct dentry *dentry, const char *name,
46 const void *value, size_t size, int flags, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070047{
48 if (strcmp(name, "") == 0)
49 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000050 return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_TRUSTED,
51 name, value, size, flags);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070052}
53
Mingming Cao617ba132006-10-11 01:20:53 -070054struct xattr_handler ext4_xattr_trusted_handler = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -070055 .prefix = XATTR_TRUSTED_PREFIX,
Mingming Cao617ba132006-10-11 01:20:53 -070056 .list = ext4_xattr_trusted_list,
57 .get = ext4_xattr_trusted_get,
58 .set = ext4_xattr_trusted_set,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070059};