Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/xattr_security.c |
ac27a0ec DK |
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> | |
ac27a0ec | 9 | #include <linux/security.h> |
5a0e3ad6 | 10 | #include <linux/slab.h> |
3dcf5451 CH |
11 | #include "ext4_jbd2.h" |
12 | #include "ext4.h" | |
ac27a0ec DK |
13 | #include "xattr.h" |
14 | ||
15 | static size_t | |
431547b3 CH |
16 | ext4_xattr_security_list(struct dentry *dentry, char *list, size_t list_size, |
17 | const char *name, size_t name_len, int type) | |
ac27a0ec DK |
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 | |
431547b3 CH |
32 | ext4_xattr_security_get(struct dentry *dentry, const char *name, |
33 | void *buffer, size_t size, int type) | |
ac27a0ec DK |
34 | { |
35 | if (strcmp(name, "") == 0) | |
36 | return -EINVAL; | |
431547b3 CH |
37 | return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY, |
38 | name, buffer, size); | |
ac27a0ec DK |
39 | } |
40 | ||
41 | static int | |
431547b3 CH |
42 | ext4_xattr_security_set(struct dentry *dentry, const char *name, |
43 | const void *value, size_t size, int flags, int type) | |
ac27a0ec DK |
44 | { |
45 | if (strcmp(name, "") == 0) | |
46 | return -EINVAL; | |
431547b3 CH |
47 | return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY, |
48 | name, value, size, flags); | |
ac27a0ec DK |
49 | } |
50 | ||
51 | int | |
2a7dba39 EP |
52 | ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir, |
53 | const struct qstr *qstr) | |
ac27a0ec DK |
54 | { |
55 | int err; | |
56 | size_t len; | |
57 | void *value; | |
58 | char *name; | |
59 | ||
2a7dba39 | 60 | err = security_inode_init_security(inode, dir, qstr, &name, &value, &len); |
ac27a0ec DK |
61 | if (err) { |
62 | if (err == -EOPNOTSUPP) | |
63 | return 0; | |
64 | return err; | |
65 | } | |
617ba13b | 66 | err = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_SECURITY, |
ac27a0ec DK |
67 | name, value, len, 0); |
68 | kfree(name); | |
69 | kfree(value); | |
70 | return err; | |
71 | } | |
72 | ||
11e27528 | 73 | const struct xattr_handler ext4_xattr_security_handler = { |
ac27a0ec | 74 | .prefix = XATTR_SECURITY_PREFIX, |
617ba13b MC |
75 | .list = ext4_xattr_security_list, |
76 | .get = ext4_xattr_security_get, | |
77 | .set = ext4_xattr_security_set, | |
ac27a0ec | 78 | }; |