Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/ext3/xattr_security.c | |
3 | * Handler for storing security labels as extended attributes. | |
4 | */ | |
5 | ||
ac50960a | 6 | #include <linux/security.h> |
4613ad18 | 7 | #include "ext3.h" |
1da177e4 LT |
8 | #include "xattr.h" |
9 | ||
10 | static size_t | |
431547b3 CH |
11 | ext3_xattr_security_list(struct dentry *dentry, char *list, size_t list_size, |
12 | const char *name, size_t name_len, int type) | |
1da177e4 | 13 | { |
ef1afd39 | 14 | const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN; |
1da177e4 LT |
15 | const size_t total_len = prefix_len + name_len + 1; |
16 | ||
17 | ||
18 | if (list && total_len <= list_size) { | |
19 | memcpy(list, XATTR_SECURITY_PREFIX, prefix_len); | |
20 | memcpy(list+prefix_len, name, name_len); | |
21 | list[prefix_len + name_len] = '\0'; | |
22 | } | |
23 | return total_len; | |
24 | } | |
25 | ||
26 | static int | |
431547b3 CH |
27 | ext3_xattr_security_get(struct dentry *dentry, const char *name, |
28 | void *buffer, size_t size, int type) | |
1da177e4 LT |
29 | { |
30 | if (strcmp(name, "") == 0) | |
31 | return -EINVAL; | |
431547b3 CH |
32 | return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY, |
33 | name, buffer, size); | |
1da177e4 LT |
34 | } |
35 | ||
36 | static int | |
431547b3 CH |
37 | ext3_xattr_security_set(struct dentry *dentry, const char *name, |
38 | const void *value, size_t size, int flags, int type) | |
1da177e4 LT |
39 | { |
40 | if (strcmp(name, "") == 0) | |
41 | return -EINVAL; | |
431547b3 CH |
42 | return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY, |
43 | name, value, size, flags); | |
1da177e4 LT |
44 | } |
45 | ||
7d6c2113 RK |
46 | static int ext3_initxattrs(struct inode *inode, |
47 | const struct xattr *xattr_array, | |
48 | void *fs_info) | |
ac50960a | 49 | { |
9d8f13ba MZ |
50 | const struct xattr *xattr; |
51 | handle_t *handle = fs_info; | |
52 | int err = 0; | |
ac50960a | 53 | |
9d8f13ba MZ |
54 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
55 | err = ext3_xattr_set_handle(handle, inode, | |
56 | EXT3_XATTR_INDEX_SECURITY, | |
57 | xattr->name, xattr->value, | |
58 | xattr->value_len, 0); | |
59 | if (err < 0) | |
60 | break; | |
ac50960a | 61 | } |
ac50960a SS |
62 | return err; |
63 | } | |
64 | ||
9d8f13ba MZ |
65 | int |
66 | ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir, | |
67 | const struct qstr *qstr) | |
68 | { | |
69 | return security_inode_init_security(inode, dir, qstr, | |
70 | &ext3_initxattrs, handle); | |
71 | } | |
72 | ||
d1f21049 | 73 | const struct xattr_handler ext3_xattr_security_handler = { |
1da177e4 LT |
74 | .prefix = XATTR_SECURITY_PREFIX, |
75 | .list = ext3_xattr_security_list, | |
76 | .get = ext3_xattr_security_get, | |
77 | .set = ext3_xattr_security_set, | |
78 | }; |