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> | |
dab291af | 9 | #include <linux/ext4_jbd2.h> |
617ba13b | 10 | #include <linux/ext4_fs.h> |
ac27a0ec DK |
11 | #include <linux/security.h> |
12 | #include "xattr.h" | |
13 | ||
14 | static size_t | |
617ba13b | 15 | ext4_xattr_security_list(struct inode *inode, char *list, size_t list_size, |
ac27a0ec DK |
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 | |
617ba13b | 31 | ext4_xattr_security_get(struct inode *inode, const char *name, |
ac27a0ec DK |
32 | void *buffer, size_t size) |
33 | { | |
34 | if (strcmp(name, "") == 0) | |
35 | return -EINVAL; | |
617ba13b | 36 | return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY, name, |
ac27a0ec DK |
37 | buffer, size); |
38 | } | |
39 | ||
40 | static int | |
617ba13b | 41 | ext4_xattr_security_set(struct inode *inode, const char *name, |
ac27a0ec DK |
42 | const void *value, size_t size, int flags) |
43 | { | |
44 | if (strcmp(name, "") == 0) | |
45 | return -EINVAL; | |
617ba13b | 46 | return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY, name, |
ac27a0ec DK |
47 | value, size, flags); |
48 | } | |
49 | ||
50 | int | |
617ba13b | 51 | ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir) |
ac27a0ec DK |
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 | } | |
617ba13b | 64 | err = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_SECURITY, |
ac27a0ec DK |
65 | name, value, len, 0); |
66 | kfree(name); | |
67 | kfree(value); | |
68 | return err; | |
69 | } | |
70 | ||
617ba13b | 71 | struct xattr_handler ext4_xattr_security_handler = { |
ac27a0ec | 72 | .prefix = XATTR_SECURITY_PREFIX, |
617ba13b MC |
73 | .list = ext4_xattr_security_list, |
74 | .get = ext4_xattr_security_get, | |
75 | .set = ext4_xattr_security_set, | |
ac27a0ec | 76 | }; |