Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 const struct qstr *qstr)
28{
29 int rc;
30 size_t len;
31 void *value;
32 char *name;
33
34 rc = security_inode_init_security(inode, dir, qstr, &name, &value, &len);
35 if (rc) {
36 if (rc == -EOPNOTSUPP)
37 return 0;
38 return rc;
39 }
40 rc = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, value, len, 0);
41
42 kfree(name);
43 kfree(value);
44 return rc;
45}
46
47/* ---- XATTR Handler for "security.*" ----------------- */
48static int jffs2_security_getxattr(struct dentry *dentry, const char *name,
49 void *buffer, size_t size, int type)
50{
51 if (!strcmp(name, ""))
52 return -EINVAL;
53
54 return do_jffs2_getxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
55 name, buffer, size);
56}
57
58static int jffs2_security_setxattr(struct dentry *dentry, const char *name,
59 const void *buffer, size_t size, int flags, int type)
60{
61 if (!strcmp(name, ""))
62 return -EINVAL;
63
64 return do_jffs2_setxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
65 name, buffer, size, flags);
66}
67
68static size_t jffs2_security_listxattr(struct dentry *dentry, char *list,
69 size_t list_size, const char *name, size_t name_len, int type)
70{
71 size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1;
72
73 if (list && retlen <= list_size) {
74 strcpy(list, XATTR_SECURITY_PREFIX);
75 strcpy(list + XATTR_SECURITY_PREFIX_LEN, name);
76 }
77
78 return retlen;
79}
80
81const struct xattr_handler jffs2_security_xattr_handler = {
82 .prefix = XATTR_SECURITY_PREFIX,
83 .list = jffs2_security_listxattr,
84 .set = jffs2_security_setxattr,
85 .get = jffs2_security_getxattr
86};