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 --- */
jffs2_initxattrs(struct inode * inode,const struct xattr * xattr_array,void * fs_info)26 static 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 ----------- */
jffs2_init_security(struct inode * inode,struct inode * dir,const struct qstr * qstr)43 int 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.*" ----------------- */
jffs2_security_getxattr(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)51 static int jffs2_security_getxattr(const struct xattr_handler *handler,
52 				   struct dentry *unused, struct inode *inode,
53 				   const char *name, void *buffer, size_t size)
54 {
55 	return do_jffs2_getxattr(inode, JFFS2_XPREFIX_SECURITY,
56 				 name, buffer, size);
57 }
58 
jffs2_security_setxattr(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * name,const void * buffer,size_t size,int flags)59 static int jffs2_security_setxattr(const struct xattr_handler *handler,
60 				   struct user_namespace *mnt_userns,
61 				   struct dentry *unused, struct inode *inode,
62 				   const char *name, const void *buffer,
63 				   size_t size, int flags)
64 {
65 	return do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY,
66 				 name, buffer, size, flags);
67 }
68 
69 const struct xattr_handler jffs2_security_xattr_handler = {
70 	.prefix = XATTR_SECURITY_PREFIX,
71 	.set = jffs2_security_setxattr,
72 	.get = jffs2_security_getxattr
73 };
74