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/fs.h>
14 #include <linux/jffs2.h>
15 #include <linux/xattr.h>
16 #include <linux/mtd/mtd.h>
17 #include "nodelist.h"
18
jffs2_trusted_getxattr(const struct xattr_handler * handler,struct dentry * dentry,const char * name,void * buffer,size_t size)19 static int jffs2_trusted_getxattr(const struct xattr_handler *handler,
20 struct dentry *dentry, const char *name,
21 void *buffer, size_t size)
22 {
23 if (!strcmp(name, ""))
24 return -EINVAL;
25 return do_jffs2_getxattr(d_inode(dentry), JFFS2_XPREFIX_TRUSTED,
26 name, buffer, size);
27 }
28
jffs2_trusted_setxattr(const struct xattr_handler * handler,struct dentry * dentry,const char * name,const void * buffer,size_t size,int flags)29 static int jffs2_trusted_setxattr(const struct xattr_handler *handler,
30 struct dentry *dentry, const char *name,
31 const void *buffer, size_t size, int flags)
32 {
33 if (!strcmp(name, ""))
34 return -EINVAL;
35 return do_jffs2_setxattr(d_inode(dentry), JFFS2_XPREFIX_TRUSTED,
36 name, buffer, size, flags);
37 }
38
jffs2_trusted_listxattr(const struct xattr_handler * handler,struct dentry * dentry,char * list,size_t list_size,const char * name,size_t name_len)39 static size_t jffs2_trusted_listxattr(const struct xattr_handler *handler,
40 struct dentry *dentry, char *list,
41 size_t list_size, const char *name,
42 size_t name_len)
43 {
44 size_t retlen = XATTR_TRUSTED_PREFIX_LEN + name_len + 1;
45
46 if (!capable(CAP_SYS_ADMIN))
47 return 0;
48
49 if (list && retlen<=list_size) {
50 strcpy(list, XATTR_TRUSTED_PREFIX);
51 strcpy(list + XATTR_TRUSTED_PREFIX_LEN, name);
52 }
53
54 return retlen;
55 }
56
57 const struct xattr_handler jffs2_trusted_xattr_handler = {
58 .prefix = XATTR_TRUSTED_PREFIX,
59 .list = jffs2_trusted_listxattr,
60 .set = jffs2_trusted_setxattr,
61 .get = jffs2_trusted_getxattr
62 };
63