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Commit | Line | Data |
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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> | |
9 | #include <linux/smp_lock.h> | |
10 | #include <linux/ext3_jbd.h> | |
11 | #include <linux/ext3_fs.h> | |
ac50960a | 12 | #include <linux/security.h> |
1da177e4 LT |
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 | ||
ac50960a SS |
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 | ||
1da177e4 LT |
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 | }; |