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xattr_trusted.c
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1 /*
2  * linux/fs/ext3/xattr_trusted.c
3  * Handler for trusted extended attributes.
4  *
5  * Copyright (C) 2003 by Andreas Gruenbacher, <[email protected]>
6  */
7 
8 #include "ext3.h"
9 #include "xattr.h"
10 
11 static size_t
12 ext3_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
13  const char *name, size_t name_len, int type)
14 {
15  const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
16  const size_t total_len = prefix_len + name_len + 1;
17 
18  if (!capable(CAP_SYS_ADMIN))
19  return 0;
20 
21  if (list && total_len <= list_size) {
22  memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
23  memcpy(list+prefix_len, name, name_len);
24  list[prefix_len + name_len] = '\0';
25  }
26  return total_len;
27 }
28 
29 static int
30 ext3_xattr_trusted_get(struct dentry *dentry, const char *name,
31  void *buffer, size_t size, int type)
32 {
33  if (strcmp(name, "") == 0)
34  return -EINVAL;
36  name, buffer, size);
37 }
38 
39 static int
40 ext3_xattr_trusted_set(struct dentry *dentry, const char *name,
41  const void *value, size_t size, int flags, int type)
42 {
43  if (strcmp(name, "") == 0)
44  return -EINVAL;
45  return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_TRUSTED, name,
46  value, size, flags);
47 }
48 
50  .prefix = XATTR_TRUSTED_PREFIX,
51  .list = ext3_xattr_trusted_list,
52  .get = ext3_xattr_trusted_get,
53  .set = ext3_xattr_trusted_set,
54 };