blob: e0f05acdafece0e0826c2985fc0a59c556fa5159 [file] [log] [blame]
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>
Mingming Caodab291a2006-10-11 01:21:01 -070012#include <linux/ext4_jbd2.h>
Mingming Cao617ba132006-10-11 01:20:53 -070013#include <linux/ext4_fs.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070014#include "xattr.h"
15
16#define XATTR_TRUSTED_PREFIX "trusted."
17
18static size_t
Mingming Cao617ba132006-10-11 01:20:53 -070019ext4_xattr_trusted_list(struct inode *inode, char *list, size_t list_size,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070020 const char *name, size_t name_len)
21{
22 const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1;
23 const size_t total_len = prefix_len + name_len + 1;
24
25 if (!capable(CAP_SYS_ADMIN))
26 return 0;
27
28 if (list && total_len <= list_size) {
29 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
30 memcpy(list+prefix_len, name, name_len);
31 list[prefix_len + name_len] = '\0';
32 }
33 return total_len;
34}
35
36static int
Mingming Cao617ba132006-10-11 01:20:53 -070037ext4_xattr_trusted_get(struct inode *inode, const char *name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070038 void *buffer, size_t size)
39{
40 if (strcmp(name, "") == 0)
41 return -EINVAL;
Mingming Cao617ba132006-10-11 01:20:53 -070042 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_TRUSTED, name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070043 buffer, size);
44}
45
46static int
Mingming Cao617ba132006-10-11 01:20:53 -070047ext4_xattr_trusted_set(struct inode *inode, const char *name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070048 const void *value, size_t size, int flags)
49{
50 if (strcmp(name, "") == 0)
51 return -EINVAL;
Mingming Cao617ba132006-10-11 01:20:53 -070052 return ext4_xattr_set(inode, EXT4_XATTR_INDEX_TRUSTED, name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070053 value, size, flags);
54}
55
Mingming Cao617ba132006-10-11 01:20:53 -070056struct xattr_handler ext4_xattr_trusted_handler = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -070057 .prefix = XATTR_TRUSTED_PREFIX,
Mingming Cao617ba132006-10-11 01:20:53 -070058 .list = ext4_xattr_trusted_list,
59 .get = ext4_xattr_trusted_get,
60 .set = ext4_xattr_trusted_set,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070061};