Root/fs/jffs2/security.c

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 Attachment -------------- */
26int jffs2_init_security(struct inode *inode, struct inode *dir)
27{
28    int rc;
29    size_t len;
30    void *value;
31    char *name;
32
33    rc = security_inode_init_security(inode, dir, &name, &value, &len);
34    if (rc) {
35        if (rc == -EOPNOTSUPP)
36            return 0;
37        return rc;
38    }
39    rc = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, value, len, 0);
40
41    kfree(name);
42    kfree(value);
43    return rc;
44}
45
46/* ---- XATTR Handler for "security.*" ----------------- */
47static int jffs2_security_getxattr(struct inode *inode, const char *name,
48                   void *buffer, size_t size)
49{
50    if (!strcmp(name, ""))
51        return -EINVAL;
52
53    return do_jffs2_getxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size);
54}
55
56static int jffs2_security_setxattr(struct inode *inode, const char *name, const void *buffer,
57                   size_t size, int flags)
58{
59    if (!strcmp(name, ""))
60        return -EINVAL;
61
62    return do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size, flags);
63}
64
65static size_t jffs2_security_listxattr(struct inode *inode, char *list, size_t list_size,
66                       const char *name, size_t name_len)
67{
68    size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1;
69
70    if (list && retlen <= list_size) {
71        strcpy(list, XATTR_SECURITY_PREFIX);
72        strcpy(list + XATTR_SECURITY_PREFIX_LEN, name);
73    }
74
75    return retlen;
76}
77
78struct xattr_handler jffs2_security_xattr_handler = {
79    .prefix = XATTR_SECURITY_PREFIX,
80    .list = jffs2_security_listxattr,
81    .set = jffs2_security_setxattr,
82    .get = jffs2_security_getxattr
83};
84

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