1/*
2 * linux/fs/ext3/xattr_security.c
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>
9#include <linux/ext3_jbd.h>
10#include <linux/ext3_fs.h>
11#include <linux/security.h>
12#include "xattr.h"
13
14static size_t
15ext3_xattr_security_list(struct inode *inode, char *list, size_t list_size,
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
30static int
31ext3_xattr_security_get(struct inode *inode, const char *name,
32		       void *buffer, size_t size)
33{
34	if (strcmp(name, "") == 0)
35		return -EINVAL;
36	return ext3_xattr_get(inode, EXT3_XATTR_INDEX_SECURITY, name,
37			      buffer, size);
38}
39
40static int
41ext3_xattr_security_set(struct inode *inode, const char *name,
42		       const void *value, size_t size, int flags)
43{
44	if (strcmp(name, "") == 0)
45		return -EINVAL;
46	return ext3_xattr_set(inode, EXT3_XATTR_INDEX_SECURITY, name,
47			      value, size, flags);
48}
49
50int
51ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir)
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	}
64	err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
65				    name, value, len, 0);
66	kfree(name);
67	kfree(value);
68	return err;
69}
70
71struct xattr_handler ext3_xattr_security_handler = {
72	.prefix	= XATTR_SECURITY_PREFIX,
73	.list	= ext3_xattr_security_list,
74	.get	= ext3_xattr_security_get,
75	.set	= ext3_xattr_security_set,
76};
77