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
15static int
16ext4_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
24static int
25ext4_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
35static int
36ext4_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
54int
55ext4_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
62const 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