Linux Kernel  3.7.1
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xattr_security.c
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1 /*
2  * linux/fs/ext3/xattr_security.c
3  * Handler for storing security labels as extended attributes.
4  */
5 
6 #include <linux/security.h>
7 #include "ext3.h"
8 #include "xattr.h"
9 
10 static size_t
11 ext3_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 size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
15  const size_t total_len = prefix_len + name_len + 1;
16 
17 
18  if (list && total_len <= list_size) {
19  memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
20  memcpy(list+prefix_len, name, name_len);
21  list[prefix_len + name_len] = '\0';
22  }
23  return total_len;
24 }
25 
26 static int
27 ext3_xattr_security_get(struct dentry *dentry, const char *name,
28  void *buffer, size_t size, int type)
29 {
30  if (strcmp(name, "") == 0)
31  return -EINVAL;
33  name, buffer, size);
34 }
35 
36 static int
37 ext3_xattr_security_set(struct dentry *dentry, const char *name,
38  const void *value, size_t size, int flags, int type)
39 {
40  if (strcmp(name, "") == 0)
41  return -EINVAL;
43  name, value, size, flags);
44 }
45 
46 int ext3_initxattrs(struct inode *inode, const struct xattr *xattr_array,
47  void *fs_info)
48 {
49  const struct xattr *xattr;
50  handle_t *handle = fs_info;
51  int err = 0;
52 
53  for (xattr = xattr_array; xattr->name != NULL; xattr++) {
54  err = ext3_xattr_set_handle(handle, inode,
56  xattr->name, xattr->value,
57  xattr->value_len, 0);
58  if (err < 0)
59  break;
60  }
61  return err;
62 }
63 
64 int
65 ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
66  const struct qstr *qstr)
67 {
68  return security_inode_init_security(inode, dir, qstr,
69  &ext3_initxattrs, handle);
70 }
71 
73  .prefix = XATTR_SECURITY_PREFIX,
74  .list = ext3_xattr_security_list,
75  .get = ext3_xattr_security_get,
76  .set = ext3_xattr_security_set,
77 };