]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
1da177e4 LT |
9 | #include <linux/ext3_jbd.h> |
10 | #include <linux/ext3_fs.h> | |
ac50960a | 11 | #include <linux/security.h> |
1da177e4 LT |
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 | ||
ac50960a SS |
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 | ||
1da177e4 LT |
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 | }; |