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/smp_lock.h>
10 #include <linux/ext3_jbd.h>
11 #include <linux/ext3_fs.h>
12 #include <linux/security.h>
13 #include "xattr.h"
14
15 static size_t
16 ext3_xattr_security_list(struct inode *inode, char *list, size_t list_size,
17 const char *name, size_t name_len)
18 {
19 const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
20 const size_t total_len = prefix_len + name_len + 1;
21
22
23 if (list && total_len <= list_size) {
24 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
25 memcpy(list+prefix_len, name, name_len);
26 list[prefix_len + name_len] = '\0';
27 }
28 return total_len;
29 }
30
31 static int
32 ext3_xattr_security_get(struct inode *inode, const char *name,
33 void *buffer, size_t size)
34 {
35 if (strcmp(name, "") == 0)
36 return -EINVAL;
37 return ext3_xattr_get(inode, EXT3_XATTR_INDEX_SECURITY, name,
38 buffer, size);
39 }
40
41 static int
42 ext3_xattr_security_set(struct inode *inode, const char *name,
43 const void *value, size_t size, int flags)
44 {
45 if (strcmp(name, "") == 0)
46 return -EINVAL;
47 return ext3_xattr_set(inode, EXT3_XATTR_INDEX_SECURITY, name,
48 value, size, flags);
49 }
50
51 int
52 ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir)
53 {
54 int err;
55 size_t len;
56 void *value;
57 char *name;
58
59 err = security_inode_init_security(inode, dir, &name, &value, &len);
60 if (err) {
61 if (err == -EOPNOTSUPP)
62 return 0;
63 return err;
64 }
65 err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
66 name, value, len, 0);
67 kfree(name);
68 kfree(value);
69 return err;
70 }
71
72 struct xattr_handler ext3_xattr_security_handler = {
73 .prefix = XATTR_SECURITY_PREFIX,
74 .list = ext3_xattr_security_list,
75 .get = ext3_xattr_security_get,
76 .set = ext3_xattr_security_set,
77 };
78
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