linux-imx

/*

 *   fs/cifs/cifsacl.c

 *

 *   Copyright (C) International Business Machines  Corp., 2007,2008

 *   Author(s): Steve French (sfrench@us.ibm.com)

 *

 *   Contains the routines for mapping CIFS/NTFS ACLs

 *

 *   This library is free software; you can redistribute it and/or modify

 *   it under the terms of the GNU Lesser General Public License as published

 *   by the Free Software Foundation; either version 2.1 of the License, or

 *   (at your option) any later version.

 *

 *   This library is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See

 *   the GNU Lesser General Public License for more details.

 *

 *   You should have received a copy of the GNU Lesser General Public License

 *   along with this library; if not, write to the Free Software

 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */

​

#include <linux/fs.h>

#include <linux/slab.h>

#include <linux/string.h>

#include <linux/keyctl.h>

#include <linux/key-type.h>

#include <keys/user-type.h>

#include "cifspdu.h"

#include "cifsglob.h"

#include "cifsacl.h"

#include "cifsproto.h"

#include "cifs_debug.h"

​

/* security id for everyone/world system group */

static const struct cifs_sid sid_everyone = {

    1, 1, {0, 0, 0, 0, 0, 1}, {0} };

/* security id for Authenticated Users system group */

static const struct cifs_sid sid_authusers = {

    1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11)} };

/* group users */

static const struct cifs_sid sid_user = {1, 2 , {0, 0, 0, 0, 0, 5}, {} };

​

/* S-1-22-1 Unmapped Unix users */

static const struct cifs_sid sid_unix_users = {1, 1, {0, 0, 0, 0, 0, 22},

        {cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };

​

/* S-1-22-2 Unmapped Unix groups */

static const struct cifs_sid sid_unix_groups = { 1, 1, {0, 0, 0, 0, 0, 22},

        {cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };

​

/*

 * See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx

 */

​

/* S-1-5-88 MS NFS and Apple style UID/GID/mode */

​

/* S-1-5-88-1 Unix uid */

static const struct cifs_sid sid_unix_NFS_users = { 1, 2, {0, 0, 0, 0, 0, 5},

    {cpu_to_le32(88),

     cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };

​

/* S-1-5-88-2 Unix gid */

static const struct cifs_sid sid_unix_NFS_groups = { 1, 2, {0, 0, 0, 0, 0, 5},

    {cpu_to_le32(88),

     cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };

​

/* S-1-5-88-3 Unix mode */

static const struct cifs_sid sid_unix_NFS_mode = { 1, 2, {0, 0, 0, 0, 0, 5},

    {cpu_to_le32(88),

     cpu_to_le32(3), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };

​

static const struct cred *root_cred;

​

static int

cifs_idmap_key_instantiate(struct key *key, struct key_preparsed_payload *prep)

{

    char *payload;

​

    /*

     * If the payload is less than or equal to the size of a pointer, then

     * an allocation here is wasteful. Just copy the data directly to the

     * payload.value union member instead.

     *

     * With this however, you must check the datalen before trying to

     * dereference payload.data!

     */

    if (prep->datalen <= sizeof(key->payload)) {

        key->payload.data[0] = NULL;

        memcpy(&key->payload, prep->data, prep->datalen);

    } else {