1/*
 2 * JFFS2 -- Journalling Flash File System, Version 2.
 3 *
 4 * Copyright © 2006  NEC Corporation
 5 *
 6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
 7 *
 8 * For licensing information, see the file 'LICENCE' in this directory.
 9 *
10 */
11
12#include <linux/kernel.h>
13#include <linux/slab.h>
14#include <linux/fs.h>
15#include <linux/time.h>
16#include <linux/pagemap.h>
17#include <linux/highmem.h>
18#include <linux/crc32.h>
19#include <linux/jffs2.h>
20#include <linux/xattr.h>
21#include <linux/mtd/mtd.h>
22#include <linux/security.h>
23#include "nodelist.h"
24
25/* ---- Initial Security Label(s) Attachment callback --- */
26static int jffs2_initxattrs(struct inode *inode,
27			    const struct xattr *xattr_array, void *fs_info)
28{
29	const struct xattr *xattr;
30	int err = 0;
31
32	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
33		err = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY,
34					xattr->name, xattr->value,
35					xattr->value_len, 0);
36		if (err < 0)
37			break;
38	}
39	return err;
40}
41
42/* ---- Initial Security Label(s) Attachment ----------- */
43int jffs2_init_security(struct inode *inode, struct inode *dir,
44			const struct qstr *qstr)
45{
46	return security_inode_init_security(inode, dir, qstr,
47					    &jffs2_initxattrs, NULL);
48}
49
50/* ---- XATTR Handler for "security.*" ----------------- */
51static int jffs2_security_getxattr(struct dentry *dentry, const char *name,
52				   void *buffer, size_t size, int type)
53{
54	if (!strcmp(name, ""))
55		return -EINVAL;
56
57	return do_jffs2_getxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
58				 name, buffer, size);
59}
60
61static int jffs2_security_setxattr(struct dentry *dentry, const char *name,
62		const void *buffer, size_t size, int flags, int type)
63{
64	if (!strcmp(name, ""))
65		return -EINVAL;
66
67	return do_jffs2_setxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
68				 name, buffer, size, flags);
69}
70
71static size_t jffs2_security_listxattr(struct dentry *dentry, char *list,
72		size_t list_size, const char *name, size_t name_len, int type)
73{
74	size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1;
75
76	if (list && retlen <= list_size) {
77		strcpy(list, XATTR_SECURITY_PREFIX);
78		strcpy(list + XATTR_SECURITY_PREFIX_LEN, name);
79	}
80
81	return retlen;
82}
83
84const struct xattr_handler jffs2_security_xattr_handler = {
85	.prefix = XATTR_SECURITY_PREFIX,
86	.list = jffs2_security_listxattr,
87	.set = jffs2_security_setxattr,
88	.get = jffs2_security_getxattr
89};