testcases/kernel/containers/mqns/mqns_01.c

/*
* Copyright (c) International Business Machines Corp., 2009
* Copyright (c) Nadia Derbey, 2009
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Nadia Derbey <Nadia.Derbey@bull.net>
*
* Check mqns isolation: father mqns cannot be accessed from newinstance
*
* Mount mqueue fs
* Create a posix mq -->mq1
* unshare
* In unshared process:
*    Mount newinstance mqueuefs
*    Check that mq1 is not readable from new ns

***************************************************************************/

#define _GNU_SOURCE 1
#include <sys/wait.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "mqns.h"

char *TCID = "posixmq_namespace_01";
int TST_TOTAL=1;

int p1[2];
int p2[2];

int check_mqueue(void *vtest)
{
	char buf[30];
	mqd_t mqd;

	close(p1[1]);
	close(p2[0]);

	read(p1[0], buf, 3);
	mqd = mq_open(SLASH_MQ1, O_RDONLY);
	if (mqd == -1) {
		write(p2[1], "notfnd", 7);
	} else {
		write(p2[1], "exists", 7);
		mq_close(mqd);
	}
	tst_exit(0);

	/* NOT REACHED */
	return 0;
}

int main(int argc, char *argv[])
{
	int r;
	mqd_t mqd;
	char buf[30];
	int use_clone = T_UNSHARE;

	if (argc == 2 && strcmp(argv[1], "-clone") == 0) {
		tst_resm(TINFO, "Testing posix mq namespaces through clone(2).\n");
		use_clone = T_CLONE;
	} else
		tst_resm(TINFO, "Testing posix mq namespaces through unshare(2).\n");

	if (pipe(p1) == -1) { perror("pipe"); exit(EXIT_FAILURE); }
	if (pipe(p2) == -1) { perror("pipe"); exit(EXIT_FAILURE); }

	mqd = mq_open(SLASH_MQ1, O_RDWR|O_CREAT|O_EXCL, 0777, NULL);
	if (mqd == -1) {
		perror("mq_open");
		tst_resm(TFAIL, "mq_open failed\n");
		tst_exit(3);
	}

	tst_resm(TINFO, "Checking namespaces isolation from parent to child\n");
	/* fire off the test */
	r = do_clone_unshare_test(use_clone, CLONE_NEWIPC, check_mqueue, NULL);
	if (r < 0) {
		tst_resm(TFAIL, "failed clone/unshare\n");
		mq_close(mqd);
		mq_unlink(SLASH_MQ1);
		tst_exit(1);
	}

	close(p1[0]);
	close(p2[1]);
	write(p1[1], "go", 3);
	read(p2[0], buf, 7);
	if (!strcmp(buf, "exists")) {
		tst_resm(TFAIL, "child process found mqueue\n");
		r = TFAIL;
	} else if (!strcmp(buf, "notfnd")) {
		tst_resm(TPASS, "child process didn't find mqueue\n");
		r = TPASS;
	} else {
		tst_resm(TFAIL, "UNKNOWN RESULT\n");
		r = TFAIL;
	}

	/* destroy the mqueue */
	mq_close(mqd);
	mq_unlink(SLASH_MQ1);

	tst_exit(r);

	/* NOT REACHED */
	return 0;
}