Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched
[linux-2.6] / fs / ext3 / xattr_security.c
1 /*
2  * linux/fs/ext3/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/ext3_jbd.h>
10 #include <linux/ext3_fs.h>
11 #include <linux/security.h>
12 #include "xattr.h"
13
14 static size_t
15 ext3_xattr_security_list(struct inode *inode, char *list, size_t list_size,
16                          const char *name, size_t name_len)
17 {
18         const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
19         const size_t total_len = prefix_len + name_len + 1;
20
21
22         if (list && total_len <= list_size) {
23                 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
24                 memcpy(list+prefix_len, name, name_len);
25                 list[prefix_len + name_len] = '\0';
26         }
27         return total_len;
28 }
29
30 static int
31 ext3_xattr_security_get(struct inode *inode, const char *name,
32                        void *buffer, size_t size)
33 {
34         if (strcmp(name, "") == 0)
35                 return -EINVAL;
36         return ext3_xattr_get(inode, EXT3_XATTR_INDEX_SECURITY, name,
37                               buffer, size);
38 }
39
40 static int
41 ext3_xattr_security_set(struct inode *inode, const char *name,
42                        const void *value, size_t size, int flags)
43 {
44         if (strcmp(name, "") == 0)
45                 return -EINVAL;
46         return ext3_xattr_set(inode, EXT3_XATTR_INDEX_SECURITY, name,
47                               value, size, flags);
48 }
49
50 int
51 ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir)
52 {
53         int err;
54         size_t len;
55         void *value;
56         char *name;
57
58         err = security_inode_init_security(inode, dir, &name, &value, &len);
59         if (err) {
60                 if (err == -EOPNOTSUPP)
61                         return 0;
62                 return err;
63         }
64         err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
65                                     name, value, len, 0);
66         kfree(name);
67         kfree(value);
68         return err;
69 }
70
71 struct xattr_handler ext3_xattr_security_handler = {
72         .prefix = XATTR_SECURITY_PREFIX,
73         .list   = ext3_xattr_security_list,
74         .get    = ext3_xattr_security_get,
75         .set    = ext3_xattr_security_set,
76 };