freebsd-skq/sys/security/mac/mac_sysv_shm.c

/*-
 * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
 * All rights reserved.
 *
 * This software was developed for the FreeBSD Project in part by Network
 * Associates Laboratories, the Security Research Division of Network
 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
 * as part of the DARPA CHATS research program.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_mac.h"

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/mac.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/namei.h>
#include <sys/sysctl.h>
#include <sys/shm.h>

#include <sys/mac_policy.h>

#include <security/mac/mac_internal.h>

static int	mac_enforce_sysv_shm = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_sysv_shm, CTLFLAG_RW,
    &mac_enforce_sysv_shm, 0,
    "Enforce MAC policy on System V IPC shared memory");
TUNABLE_INT("security.mac.enforce_sysv", &mac_enforce_sysv_shm);

static struct label *
mac_sysv_shm_label_alloc(void)
{
	struct label *label;

	label = mac_labelzone_alloc(M_WAITOK);
	MAC_PERFORM(init_sysv_shm_label, label);
	return (label);
}

void
mac_init_sysv_shm(struct shmid_kernel *shmsegptr)
{

	shmsegptr->label = mac_sysv_shm_label_alloc();
}

static void
mac_sysv_shm_label_free(struct label *label)
{

	MAC_PERFORM(destroy_sysv_shm_label, label);
	mac_labelzone_free(label);
}

void
mac_destroy_sysv_shm(struct shmid_kernel *shmsegptr)
{

	mac_sysv_shm_label_free(shmsegptr->label);
	shmsegptr->label = NULL;
}

void
mac_create_sysv_shm(struct ucred *cred, struct shmid_kernel *shmsegptr)
{

	MAC_PERFORM(create_sysv_shm, cred, shmsegptr, shmsegptr->label);
}

void
mac_cleanup_sysv_shm(struct shmid_kernel *shmsegptr)
{

	MAC_PERFORM(cleanup_sysv_shm, shmsegptr->label);
}

int
mac_check_sysv_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
    int shmflg)
{
	int error;

	if (!mac_enforce_sysv_shm)
		return (0);

	MAC_CHECK(check_sysv_shmat, cred, shmsegptr, shmsegptr->label,
	    shmflg);

	return(error);
}

int
mac_check_sysv_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
    int cmd)
{
	int error;

	if (!mac_enforce_sysv_shm)
		return (0);

	MAC_CHECK(check_sysv_shmctl, cred, shmsegptr, shmsegptr->label,
	    cmd);

	return(error);
}

int
mac_check_sysv_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
{
	int error;

	if (!mac_enforce_sysv_shm)
		return (0);

	MAC_CHECK(check_sysv_shmdt, cred, shmsegptr, shmsegptr->label);

	return(error);
}

int
mac_check_sysv_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
    int shmflg)
{
	int error;

	if (!mac_enforce_sysv_shm)
		return (0);

	MAC_CHECK(check_sysv_shmget, cred, shmsegptr, shmsegptr->label,
	    shmflg);

	return(error);
}