1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * linux/fs/ext4/xattr_security.c |
4 | * Handler for storing security labels as extended attributes. |
5 | */ |
6 | |
7 | #include <linux/string.h> |
8 | #include <linux/fs.h> |
9 | #include <linux/security.h> |
10 | #include <linux/slab.h> |
11 | #include "ext4_jbd2.h" |
12 | #include "ext4.h" |
13 | #include "xattr.h" |
14 | |
15 | static int |
16 | ext4_xattr_security_get(const struct xattr_handler *handler, |
17 | struct dentry *unused, struct inode *inode, |
18 | const char *name, void *buffer, size_t size) |
19 | { |
20 | return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY, |
21 | name, buffer, size); |
22 | } |
23 | |
24 | static int |
25 | ext4_xattr_security_set(const struct xattr_handler *handler, |
26 | struct mnt_idmap *idmap, |
27 | struct dentry *unused, struct inode *inode, |
28 | const char *name, const void *value, |
29 | size_t size, int flags) |
30 | { |
31 | return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY, |
32 | name, value, size, flags); |
33 | } |
34 | |
35 | static int |
36 | ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array, |
37 | void *fs_info) |
38 | { |
39 | const struct xattr *xattr; |
40 | handle_t *handle = fs_info; |
41 | int err = 0; |
42 | |
43 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
44 | err = ext4_xattr_set_handle(handle, inode, |
45 | EXT4_XATTR_INDEX_SECURITY, |
46 | xattr->name, xattr->value, |
47 | xattr->value_len, XATTR_CREATE); |
48 | if (err < 0) |
49 | break; |
50 | } |
51 | return err; |
52 | } |
53 | |
54 | int |
55 | ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir, |
56 | const struct qstr *qstr) |
57 | { |
58 | return security_inode_init_security(inode, dir, qstr, |
59 | initxattrs: &ext4_initxattrs, fs_data: handle); |
60 | } |
61 | |
62 | const struct xattr_handler ext4_xattr_security_handler = { |
63 | .prefix = XATTR_SECURITY_PREFIX, |
64 | .get = ext4_xattr_security_get, |
65 | .set = ext4_xattr_security_set, |
66 | }; |
67 | |