1 /*
2 * linux/fs/ext2/xattr_security.c
3 * Handler for storing security labels as extended attributes.
4 */
5
6 #include <linux/module.h>
7 #include <linux/string.h>
8 #include <linux/fs.h>
9 #include <linux/smp_lock.h>
10 #include <linux/ext2_fs.h>
11 #include <linux/security.h>
12 #include "xattr.h"
13
14 static size_t
15 ext2_xattr_security_list(struct inode *inode, char *list, size_t list_size,
16 const char *name, size_t name_len)
17 {
18 const int prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
19 const size_t total_len = prefix_len + name_len + 1;
20
21 if (list && total_len <= list_size) {
22 memcpy(list, XATTR_SECURITY_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 ext2_xattr_security_get(struct inode *inode, const char *name,
31 void *buffer, size_t size)
32 {
33 if (strcmp(name, "") == 0)
34 return -EINVAL;
35 return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name,
36 buffer, size);
37 }
38
39 static int
40 ext2_xattr_security_set(struct inode *inode, const char *name,
41 const void *value, size_t size, int flags)
42 {
43 if (strcmp(name, "") == 0)
44 return -EINVAL;
45 return ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, name,
46 value, size, flags);
47 }
48
49 int
50 ext2_init_security(struct inode *inode, struct inode *dir)
51 {
52 int err;
53 size_t len;
54 void *value;
55 char *name;
56
57 err = security_inode_init_security(inode, dir, &name, &value, &len);
58 if (err) {
59 if (err == -EOPNOTSUPP)
60 return 0;
61 return err;
62 }
63 err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
64 name, value, len, 0);
65 kfree(name);
66 kfree(value);
67 return err;
68 }
69
70 struct xattr_handler ext2_xattr_security_handler = {
71 .prefix = XATTR_SECURITY_PREFIX,
72 .list = ext2_xattr_security_list,
73 .get = ext2_xattr_security_get,
74 .set = ext2_xattr_security_set,
75 };
76
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