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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> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
1da177e4 LT |
8 | #include <linux/string.h> |
9 | #include <linux/fs.h> | |
1da177e4 LT |
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 | |
431547b3 CH |
16 | ext3_xattr_security_list(struct dentry *dentry, char *list, size_t list_size, |
17 | const char *name, size_t name_len, int type) | |
1da177e4 | 18 | { |
ef1afd39 | 19 | const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN; |
1da177e4 LT |
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 | |
431547b3 CH |
32 | ext3_xattr_security_get(struct dentry *dentry, const char *name, |
33 | void *buffer, size_t size, int type) | |
1da177e4 LT |
34 | { |
35 | if (strcmp(name, "") == 0) | |
36 | return -EINVAL; | |
431547b3 CH |
37 | return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY, |
38 | name, buffer, size); | |
1da177e4 LT |
39 | } |
40 | ||
41 | static int | |
431547b3 CH |
42 | ext3_xattr_security_set(struct dentry *dentry, const char *name, |
43 | const void *value, size_t size, int flags, int type) | |
1da177e4 LT |
44 | { |
45 | if (strcmp(name, "") == 0) | |
46 | return -EINVAL; | |
431547b3 CH |
47 | return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY, |
48 | name, value, size, flags); | |
1da177e4 LT |
49 | } |
50 | ||
9d8f13ba MZ |
51 | int ext3_initxattrs(struct inode *inode, const struct xattr *xattr_array, |
52 | void *fs_info) | |
ac50960a | 53 | { |
9d8f13ba MZ |
54 | const struct xattr *xattr; |
55 | handle_t *handle = fs_info; | |
56 | int err = 0; | |
ac50960a | 57 | |
9d8f13ba MZ |
58 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
59 | err = ext3_xattr_set_handle(handle, inode, | |
60 | EXT3_XATTR_INDEX_SECURITY, | |
61 | xattr->name, xattr->value, | |
62 | xattr->value_len, 0); | |
63 | if (err < 0) | |
64 | break; | |
ac50960a | 65 | } |
ac50960a SS |
66 | return err; |
67 | } | |
68 | ||
9d8f13ba MZ |
69 | int |
70 | ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir, | |
71 | const struct qstr *qstr) | |
72 | { | |
73 | return security_inode_init_security(inode, dir, qstr, | |
74 | &ext3_initxattrs, handle); | |
75 | } | |
76 | ||
d1f21049 | 77 | const struct xattr_handler ext3_xattr_security_handler = { |
1da177e4 LT |
78 | .prefix = XATTR_SECURITY_PREFIX, |
79 | .list = ext3_xattr_security_list, | |
80 | .get = ext3_xattr_security_get, | |
81 | .set = ext3_xattr_security_set, | |
82 | }; |