GNU Linux-libre 4.19.211-gnu1
[releases.git] / fs / ext4 / xattr_security.c
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 dentry *unused, struct inode *inode,
27                         const char *name, const void *value,
28                         size_t size, int flags)
29 {
30         return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY,
31                               name, value, size, flags);
32 }
33
34 static int
35 ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
36                 void *fs_info)
37 {
38         const struct xattr *xattr;
39         handle_t *handle = fs_info;
40         int err = 0;
41
42         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
43                 err = ext4_xattr_set_handle(handle, inode,
44                                             EXT4_XATTR_INDEX_SECURITY,
45                                             xattr->name, xattr->value,
46                                             xattr->value_len, XATTR_CREATE);
47                 if (err < 0)
48                         break;
49         }
50         return err;
51 }
52
53 int
54 ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
55                    const struct qstr *qstr)
56 {
57         return security_inode_init_security(inode, dir, qstr,
58                                             &ext4_initxattrs, handle);
59 }
60
61 const struct xattr_handler ext4_xattr_security_handler = {
62         .prefix = XATTR_SECURITY_PREFIX,
63         .get    = ext4_xattr_security_get,
64         .set    = ext4_xattr_security_set,
65 };