1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * linux/fs/ext2/xattr_security.c
 4 * Handler for storing security labels as extended attributes.
 5 */
 6
 7#include "ext2.h"
 
 
 
 
 8#include <linux/security.h>
 9#include "xattr.h"
10
11static int
12ext2_xattr_security_get(const struct xattr_handler *handler,
13			struct dentry *unused, struct inode *inode,
14			const char *name, void *buffer, size_t size)
15{
16	return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name,
17			      buffer, size);
 
 
 
 
 
 
 
18}
19
20static int
21ext2_xattr_security_set(const struct xattr_handler *handler,
22			struct user_namespace *mnt_userns,
23			struct dentry *unused, struct inode *inode,
24			const char *name, const void *value,
25			size_t size, int flags)
26{
27	return ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, name,
28			      value, size, flags);
 
 
29}
30
31static int ext2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
32			   void *fs_info)
 
33{
34	const struct xattr *xattr;
35	int err = 0;
36
37	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
38		err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
39				     xattr->name, xattr->value,
40				     xattr->value_len, 0);
41		if (err < 0)
42			break;
43	}
44	return err;
45}
46
47int
48ext2_init_security(struct inode *inode, struct inode *dir,
49		   const struct qstr *qstr)
50{
51	return security_inode_init_security(inode, dir, qstr,
52					    &ext2_initxattrs, NULL);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
53}
54
55const struct xattr_handler ext2_xattr_security_handler = {
56	.prefix	= XATTR_SECURITY_PREFIX,
 
57	.get	= ext2_xattr_security_get,
58	.set	= ext2_xattr_security_set,
59};

 
 1/*
 2 * linux/fs/ext2/xattr_security.c
 3 * Handler for storing security labels as extended attributes.
 4 */
 5
 6#include <linux/module.h>
 7#include <linux/slab.h>
 8#include <linux/string.h>
 9#include <linux/fs.h>
10#include <linux/ext2_fs.h>
11#include <linux/security.h>
12#include "xattr.h"
13
14static size_t
15ext2_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
16			 const char *name, size_t name_len, int type)
 
17{
18	const int prefix_len = XATTR_SECURITY_PREFIX_LEN;
19	const size_t total_len = prefix_len + name_len + 1;
20
21	if (list && total_len <= list_size) {
22		memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
23		memcpy(list+prefix_len, name, name_len);
24		list[prefix_len + name_len] = '\0';
25	}
26	return total_len;
27}
28
29static int
30ext2_xattr_security_get(struct dentry *dentry, const char *name,
31		       void *buffer, size_t size, int type)
 
 
 
32{
33	if (strcmp(name, "") == 0)
34		return -EINVAL;
35	return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
36			      buffer, size);
37}
38
39static int
40ext2_xattr_security_set(struct dentry *dentry, const char *name,
41		const void *value, size_t size, int flags, int type)
42{
43	if (strcmp(name, "") == 0)
44		return -EINVAL;
45	return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
46			      value, size, flags);
 
 
 
 
 
 
 
47}
48
49int
50ext2_init_security(struct inode *inode, struct inode *dir,
51		   const struct qstr *qstr)
52{
53	int err;
54	size_t len;
55	void *value;
56	char *name;
57
58	err = security_inode_init_security(inode, dir, qstr, &name, &value, &len);
59	if (err) {
60		if (err == -EOPNOTSUPP)
61			return 0;
62		return err;
63	}
64	err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
65			     name, value, len, 0);
66	kfree(name);
67	kfree(value);
68	return err;
69}
70
71const struct xattr_handler ext2_xattr_security_handler = {
72	.prefix	= XATTR_SECURITY_PREFIX,
73	.list	= ext2_xattr_security_list,
74	.get	= ext2_xattr_security_get,
75	.set	= ext2_xattr_security_set,
76};