testcases/kernel/syscalls/capset/capset02.c

/*
 * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */
/**********************************************************
 *
 *    TEST IDENTIFIER	: capset02
 *
 *    EXECUTED BY	: anyone
 *
 *    TEST TITLE	: Tests for error conditions.
 *
 *    TEST CASE TOTAL	: 4
 *
 *    AUTHOR		: Saji Kumar.V.R <saji.kumar@wipro.com>
 *
 *    SIGNALS
 * 	Uses SIGUSR1 to pause before test if option set.
 * 	(See the parse_opts(3) man page).
 *
 *    DESCRIPTION
 *	Verify that
 *	1) capset() fails with errno set to EFAULT if an invalid address
 *	   is given for header
 *	2) capset() fails with errno set to EFAULT if an invalid address
 *	   is given for data
 *	3) capset() fails with errno set to EINVAL if an invalid value
 *	   is given for header->version
 *	4) capset() fails with errno set to EPERM the process does not
 *	   have enough privilege to set capabilities
 *
 *
 * 	Setup:
 * 	  Setup signal handling.
 *	  Pause for SIGUSR1 if option specified.
 *	  Call capget() to save current capability data
 *
 * 	Test:
 *	 Loop if the proper options are given.
 *	  do test specific setup.
 * 	  call capset with proper arguments
 *	  if capset() fails with expected errno
 *		Test passed
 *	  Otherwise
 *		Test failed
 *	  do test specific cleanup
 *
 * 	Cleanup:
 * 	  Print errno log and/or timing stats if options given
 *
 * USAGE:  <for command-line>
 * capset02 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-h] [-f] [-p]
 *			where,  -c n : Run n copies concurrently.
 *				-e   : Turn on errno logging.
 *				-h   : Show help screen
 *				-f   : Turn off functional testing
 *				-i n : Execute test n times.
 *				-I x : Execute test for x seconds.
 *				-p   : Pause for SIGUSR1 before starting
 *				-P x : Pause for x seconds between iterations.
 *				-t   : Turn on syscall timing.
 *
 ****************************************************************/
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <pwd.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include "test.h"
#include "linux_syscall_numbers.h"

/**************************************************************************/
/*                                                                        */
/*   Some archs do not have the manpage documented sys/capability.h file, */
/*   and require the use of the line below                                */

#include <linux/capability.h>

/*   If you are having issues with including this file and have the sys/  */
/*   version, then you may want to try switching to it. -Robbie W.        */
/**************************************************************************/

#define INVALID_VERSION 0

static void setup(void);
static void cleanup(void);
static void test_setup(int, char *);
static void child_func(void);

static pid_t child_pid = -1;

char *TCID = "capset02";

static struct __user_cap_header_struct header;
static struct __user_cap_data_struct data;

struct test_case_t {
	cap_user_header_t headerp;
	cap_user_data_t datap;
	int exp_errno;
	char *errdesc;
} test_cases[] = {
#ifndef UCLINUX
	/* Skip since uClinux does not implement memory protection */
	{
	(cap_user_header_t) - 1, &data, EFAULT, "EFAULT"}, {
	&header, (cap_user_data_t) - 1, EFAULT, "EFAULT"},
#endif
	{
	&header, &data, EINVAL, "EINVAL"}, {
&header, &data, EPERM, "EPERM"},};

int TST_TOTAL = sizeof(test_cases) / sizeof(test_cases[0]);

int main(int ac, char **av)
{

	int lc, i;
	const char *msg;

	if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL)
		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
#ifdef UCLINUX
	maybe_run_child(&child_func, "");
#endif

	setup();

	for (lc = 0; TEST_LOOPING(lc); lc++) {

		tst_count = 0;

#ifdef UCLINUX
		i = 2;
#else
		i = 0;
#endif

		for (; i < TST_TOTAL; i++) {

			test_setup(i, av[0]);
			TEST(ltp_syscall(__NR_capset, test_cases[i].headerp,
				     test_cases[i].datap));

			if (TEST_RETURN == -1 &&
			    TEST_ERRNO == test_cases[i].exp_errno) {
				tst_resm(TPASS, "capset() returned -1,"
					 " errno: %s", test_cases[i].errdesc);
			} else {
				tst_resm(TFAIL | TTERRNO,
					 "Test Failed, capset() returned %ld",
					 TEST_RETURN);
			}
		}
	}

	cleanup();

	tst_exit();

}

void setup(void)
{

	TEST_PAUSE;

	/*
	 * Save current capability data.
	 * header.version must be _LINUX_CAPABILITY_VERSION
	 */
	header.version = _LINUX_CAPABILITY_VERSION;
	if (ltp_syscall(__NR_capget, &header, &data) == -1)
		tst_brkm(TBROK | TERRNO, NULL, "capget failed");
}

void cleanup(void)
{
	if (0 < child_pid) {
		kill(child_pid, SIGTERM);
		wait(NULL);
	}
}

void child_func(void)
{
	for (;;) {
		sleep(10);
	}
}

void test_setup(int i, char *argv0)
{
	char nobody_uid[] = "nobody";
	struct passwd *ltpuser;

	switch (i) {
	case 0:
		break;

	case 1:
		header.version = _LINUX_CAPABILITY_VERSION;
		header.pid = 0;
		break;

	case 2:
		header.version = INVALID_VERSION;
		header.pid = 0;
		break;

	case 3:
		header.version = _LINUX_CAPABILITY_VERSION;
		/*
		 * when a non-zero pid is specified, process should have
		 * CAP_SETPCAP capability to change capabilities.
		 * by default, CAP_SETPCAP is not enabled. So giving
		 * a non-zero pid results in capset() failing with
		 * errno EPERM
		 *
		 * Note: this seems to have changed with recent kernels
		 * => create a child and try to set its capabilities
		 */
		child_pid = FORK_OR_VFORK();
		if (child_pid == -1)
			tst_brkm(TBROK | TERRNO, cleanup, "fork failed");
		else if (child_pid == 0) {
#ifdef UCLINUX
			if (self_exec(argv0, "") < 0) {
				perror("self_exec failed");
				exit(1);
			}
#else
			child_func();
#endif
		} else {
			header.pid = child_pid;
			ltpuser = getpwnam(nobody_uid);
			if (ltpuser == NULL)
				tst_brkm(TBROK | TERRNO, cleanup,
					 "getpwnam failed");
			if (seteuid(ltpuser->pw_uid) == -1)
				tst_brkm(TBROK | TERRNO, cleanup,
					 "seteuid failed");

		}
		break;

	}
}