tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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>
10#include <linux/fs.h>
11#include <linux/smp_lock.h>
12#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;
41 if (!capable(CAP_SYS_ADMIN))
42 return -EPERM;
43 return ext2_xattr_get(inode, EXT2_XATTR_INDEX_TRUSTED, name,
44 buffer, size);
45}
46
47static int
48ext2_xattr_trusted_set(struct inode *inode, const char *name,
49 const void *value, size_t size, int flags)
50{
51 if (strcmp(name, "") == 0)
52 return -EINVAL;
53 if (!capable(CAP_SYS_ADMIN))
54 return -EPERM;
55 return ext2_xattr_set(inode, EXT2_XATTR_INDEX_TRUSTED, name,
56 value, size, flags);
57}
58
59struct xattr_handler ext2_xattr_trusted_handler = {
60 .prefix = XATTR_TRUSTED_PREFIX,
61 .list = ext2_xattr_trusted_list,
62 .get = ext2_xattr_trusted_get,
63 .set = ext2_xattr_trusted_set,
64};