Linux Kernel  3.7.1
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xattr_security.c
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1 /*
2  * linux/fs/ext2/xattr_security.c
3  * Handler for storing security labels as extended attributes.
4  */
5 
6 #include "ext2.h"
7 #include <linux/security.h>
8 #include "xattr.h"
9 
10 static size_t
11 ext2_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
12  const char *name, size_t name_len, int type)
13 {
14  const int prefix_len = XATTR_SECURITY_PREFIX_LEN;
15  const size_t total_len = prefix_len + name_len + 1;
16 
17  if (list && total_len <= list_size) {
18  memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
19  memcpy(list+prefix_len, name, name_len);
20  list[prefix_len + name_len] = '\0';
21  }
22  return total_len;
23 }
24 
25 static int
26 ext2_xattr_security_get(struct dentry *dentry, const char *name,
27  void *buffer, size_t size, int type)
28 {
29  if (strcmp(name, "") == 0)
30  return -EINVAL;
31  return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
32  buffer, size);
33 }
34 
35 static int
36 ext2_xattr_security_set(struct dentry *dentry, const char *name,
37  const void *value, size_t size, int flags, int type)
38 {
39  if (strcmp(name, "") == 0)
40  return -EINVAL;
41  return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
42  value, size, flags);
43 }
44 
45 int ext2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
46  void *fs_info)
47 {
48  const struct xattr *xattr;
49  int err = 0;
50 
51  for (xattr = xattr_array; xattr->name != NULL; xattr++) {
53  xattr->name, xattr->value,
54  xattr->value_len, 0);
55  if (err < 0)
56  break;
57  }
58  return err;
59 }
60 
61 int
62 ext2_init_security(struct inode *inode, struct inode *dir,
63  const struct qstr *qstr)
64 {
65  return security_inode_init_security(inode, dir, qstr,
67 }
68 
70  .prefix = XATTR_SECURITY_PREFIX,
71  .list = ext2_xattr_security_list,
72  .get = ext2_xattr_security_get,
73  .set = ext2_xattr_security_set,
74 };