testcases/kernel/syscalls/chroot/chroot01.c

/*
 *
 *   Copyright (c) International Business Machines  Corp., 2001
 *
 *   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
 */

/*
 * NAME
 * 	chroot01.c
 *
 * DESCRIPTION
 *	Testcase to check the whether chroot sets errno to EPERM.
 *
 * ALGORITHM
 *	As a non-root user attempt to perform chroot() to a directory. The
 *	chroot() call should fail with EPERM
 *
 * USAGE:  <for command-line>
 *  chroot01 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
 *     where,  -c n : Run n copies concurrently.
 *             -e   : Turn on errno logging.
 *             -i n : Execute test n times.
 *             -I x : Execute test for x seconds.
 *             -P x : Pause for x seconds between iterations.
 *             -t   : Turn on syscall timing.
 *
 * HISTORY
 *	07/2001 Ported by Wayne Boyer
 *
 * RESTRICTIONS
 * 	Must be run as non-root user.
 */

#include <stdio.h>
#include <errno.h>
#include "test.h"
#include "usctest.h"
#include <pwd.h>

char *TCID = "chroot01";
int TST_TOTAL = 1;
extern int Tst_count;
int fail;

char path[] = "/tmp";
int exp_enos[] = {EPERM, 0};
char nobody_uid[] = "nobody";
struct passwd *ltpuser;

void setup(void);
void cleanup(void);

main(int ac, char **av)
{
	int lc;
	char *msg;

	/* parse standard options */
	if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
		tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
	}

	setup();

	/* set up expected errnos */
	TEST_EXP_ENOS(exp_enos);

	/* Check for looping state if -i option is given */
	for (lc = 0; TEST_LOOPING(lc); lc++) {

		/* reset Tst_count in case we are looping */
		Tst_count = 0;

		TEST(chroot(path));

		if (TEST_RETURN != -1) {
			tst_resm(TFAIL, "call succeeded on expected fail");
		} else if (errno != EPERM) {
			tst_resm(TFAIL, "Received unexpected error - %d : %s",
					 TEST_ERRNO, strerror(TEST_ERRNO));
		} else {
			TEST_ERROR_LOG(TEST_ERRNO);
			tst_resm(TPASS, "chroot set errno to EPERM.");
		}
	}
	cleanup();

	/*NOTREACHED*/
}

/*
 * setup() - performs all ONE TIME setup for this test.
 */
void
setup()
{

	/* Switch to nobody user for correct error code collection */
        if (geteuid() != 0) {
                tst_brkm(TBROK, tst_exit, "Test must be run as root");
        }
         ltpuser = getpwnam(nobody_uid);
         if (seteuid(ltpuser->pw_uid) == -1) {
                tst_resm(TINFO, "seteuid failed to "
                         "to set the effective uid to %d",
                         ltpuser->pw_uid);
                perror("seteuid");
         }


	/* capture signals */
	tst_sig(NOFORK, DEF_HANDLER, cleanup);

	/* Pause if that option was specified */
	TEST_PAUSE;

	/* make a temporary directory and cd to it */
	tst_tmpdir();
}


/*
 * cleanup() - performs all ONE TIME cleanup for this test at
 *	       completion or premature exit.
 */
void
cleanup()
{
	/*
	 * print timing stats if that option was specified.
	 * print errno log if that option was specified.
	 */
	TEST_CLEANUP;

	/* delete the test directory created in setup() */
	tst_rmdir();

	/* exit with return code appropriate for results */
	tst_exit();
}