1 /*
2 * linux/fs/ext3/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 "ext3.h"
9 #include "xattr.h"
10
11 static size_t
ext3_xattr_trusted_list(struct dentry * dentry,char * list,size_t list_size,const char * name,size_t name_len,int type)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
ext3_xattr_trusted_get(struct dentry * dentry,const char * name,void * buffer,size_t size,int type)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;
35 return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_TRUSTED,
36 name, buffer, size);
37 }
38
39 static int
ext3_xattr_trusted_set(struct dentry * dentry,const char * name,const void * value,size_t size,int flags,int type)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
49 const struct xattr_handler ext3_xattr_trusted_handler = {
50 .prefix = XATTR_TRUSTED_PREFIX,
51 .list = ext3_xattr_trusted_list,
52 .get = ext3_xattr_trusted_get,
53 .set = ext3_xattr_trusted_set,
54 };
55