[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / jffs2 / security.c

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2006  NEC Corporation
 *
 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/crc32.h>
#include <linux/jffs2.h>
#include <linux/xattr.h>
#include <linux/mtd/mtd.h>
#include <linux/security.h>
#include "nodelist.h"

/* ---- Initial Security Label(s) Attachment callback --- */
static int jffs2_initxattrs(struct inode *inode,
			    const struct xattr *xattr_array, void *fs_info)
{
	const struct xattr *xattr;
	int err = 0;

	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
		err = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY,
					xattr->name, xattr->value,
					xattr->value_len, 0);
		if (err < 0)
			break;
	}
	return err;
}

/* ---- Initial Security Label(s) Attachment ----------- */
int jffs2_init_security(struct inode *inode, struct inode *dir,
			const struct qstr *qstr)
{
	return security_inode_init_security(inode, dir, qstr,
					    &jffs2_initxattrs, NULL);
}

/* ---- XATTR Handler for "security.*" ----------------- */
static int jffs2_security_getxattr(struct dentry *dentry, const char *name,
				   void *buffer, size_t size, int type)
{
	if (!strcmp(name, ""))
		return -EINVAL;

	return do_jffs2_getxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
				 name, buffer, size);
}

static int jffs2_security_setxattr(struct dentry *dentry, const char *name,
		const void *buffer, size_t size, int flags, int type)
{
	if (!strcmp(name, ""))
		return -EINVAL;

	return do_jffs2_setxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
				 name, buffer, size, flags);
}

static size_t jffs2_security_listxattr(struct dentry *dentry, char *list,
		size_t list_size, const char *name, size_t name_len, int type)
{
	size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1;

	if (list && retlen <= list_size) {
		strcpy(list, XATTR_SECURITY_PREFIX);
		strcpy(list + XATTR_SECURITY_PREFIX_LEN, name);
	}

	return retlen;
}

const struct xattr_handler jffs2_security_xattr_handler = {
	.prefix = XATTR_SECURITY_PREFIX,
	.list = jffs2_security_listxattr,
	.set = jffs2_security_setxattr,
	.get = jffs2_security_getxattr
};
Commit	Line	Data
652ecc20 KK	1	/*
652ecc20 KK	2	* JFFS2 -- Journalling Flash File System, Version 2.
aa98d7cf	3	*
c00c310e	4	* Copyright © 2006 NEC Corporation
aa98d7cf	5	*
652ecc20 KK	6	* Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
	7	*
	8	* For licensing information, see the file 'LICENCE' in this directory.
	9	*
	10	*/
c00c310e	11
aa98d7cf KK	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
9d8f13ba	25	/* ---- Initial Security Label(s) Attachment callback --- */
273a65ad NP	26	static int jffs2_initxattrs(struct inode *inode,
273a65ad NP	27	const struct xattr xattr_array, void fs_info)
aa98d7cf	28	{
9d8f13ba MZ	29	const struct xattr *xattr;
9d8f13ba MZ	30	int err = 0;
aa98d7cf	31
9d8f13ba MZ	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;
aa98d7cf	38	}
9d8f13ba MZ	39	return err;
9d8f13ba MZ	40	}
aa98d7cf	41
9d8f13ba MZ	42	/* ---- Initial Security Label(s) Attachment ----------- */
	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);
aa98d7cf KK	48	}
	49
	50	/* ---- XATTR Handler for "security." ----------------- /
431547b3 CH	51	static int jffs2_security_getxattr(struct dentry dentry, const char name,
431547b3 CH	52	void *buffer, size_t size, int type)
aa98d7cf KK	53	{
	54	if (!strcmp(name, ""))
	55	return -EINVAL;
	56
431547b3 CH	57	return do_jffs2_getxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
431547b3 CH	58	name, buffer, size);
aa98d7cf KK	59	}
aa98d7cf KK	60
431547b3 CH	61	static int jffs2_security_setxattr(struct dentry dentry, const char name,
431547b3 CH	62	const void *buffer, size_t size, int flags, int type)
aa98d7cf KK	63	{
	64	if (!strcmp(name, ""))
	65	return -EINVAL;
	66
431547b3 CH	67	return do_jffs2_setxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
431547b3 CH	68	name, buffer, size, flags);
aa98d7cf KK	69	}
aa98d7cf KK	70
431547b3 CH	71	static size_t jffs2_security_listxattr(struct dentry dentry, char list,
431547b3 CH	72	size_t list_size, const char *name, size_t name_len, int type)
aa98d7cf KK	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
365f0cb9	84	const struct xattr_handler jffs2_security_xattr_handler = {
aa98d7cf KK	85	.prefix = XATTR_SECURITY_PREFIX,
	86	.list = jffs2_security_listxattr,
	87	.set = jffs2_security_setxattr,
	88	.get = jffs2_security_getxattr
	89	};