testcases/kernel/module/delete_module/delete_module02.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., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 */
/**********************************************************
 *
 *    TEST IDENTIFIER   : delete_module02
 *
 *    EXECUTED BY       : root / superuser
 *
 *    TEST TITLE        : Checking error conditions for delete_module(2)
 *
 *    TEST CASE TOTAL   : 5
 *
 *    AUTHOR            : Madhu T L <madhu.tarikere@wipro.com>
 *
 *    SIGNALS
 *      Uses SIGUSR1 to pause before test if option set.
 *      (See the parse_opts(3) man page).
 *
 *    DESCRIPTION
 *      Verify that,
 *      1. delete_module(2) returns -1 and sets errno to ENOENT for nonexistent
 *	   module entry.
 *      2. delete_module(2) returns -1 and sets errno to EINVAL, if module
 *         name parameter is null terminated (zero length) string.
 *      3. delete_module(2) returns -1 and sets errno to EFAULT, if
 *         module name parameter is outside program's accessible address space.
 *      4. delete_module(2) returns -1 and sets errno to ENAMETOOLONG, if
 *         module name parameter is too long.
 *      5. delete_module(2) returns -1 and sets errno to EPERM, if effective
 *         user id of the caller is not superuser.
 *
 *      Setup:
 *        Setup signal handling.
 *        Test caller is super user
 *        Check existances of "nobody" user id.
 *        Initialize  long module name
 *        Set expected errnos for logging
 *        Pause for SIGUSR1 if option specified.
 *		   Initialize modname for each child process
 *
 *      Test:
 *       Loop if the proper options are given.
 *		   Perform testcase specific setup (if needed)
 *        Execute system call
 *        Check return code and error number, if matching,
 *                   Issue PASS message
 *        Otherwise,
 *                   Issue FAIL message
 *		   Perform testcase specific cleanup (if needed)
 *
 *      Cleanup:
 *        Print errno log and/or timing stats if options given
 *
 * USAGE:  <for command-line>
 *  delete_module02 [-c n] [-e] [-f] [-h] [-i n] [-I x] [-p] [-P x] [-t]
 *		 		 where,  -c n : Run n copies concurrently.
 *	 		 		 -e   : Turn on errno logging.
 *	 		 		 -f   : Turn off functional testing
 *	 		 		 -h   : Show help screen
 *	 		 		 -i n : Execute test n times.
 *	 		 		 -I x : Execute test for x seconds.
 *	 		 		 -p   : Pause for SIGUSR1 before
 *	 		 		 	starting test.
 *	 		 		 -P x : Pause for x seconds between
 *	 		 		 	iterations.
 *	 		 		 -t   : Turn on syscall timing.
 *
 ****************************************************************/

#include <errno.h>
#include <pwd.h>
#include <sys/types.h>
#include <unistd.h>
#include <limits.h>
#if HAVE_LINUX_MODULE_H
#include <linux/module.h>
#else
/* As per http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/include/linux/moduleparam.h?a=ppc#L17 ... */
#define MODULE_NAME_LEN	( 64 - sizeof(unsigned long) )
#endif
#include <sys/mman.h>
#include "test.h"
#include "usctest.h"


#define NULLMODNAME ""
#define BASEMODNAME "dummy"
#define LONGMODNAMECHAR 'm'			/* Arbitrarily selected */
#define EXP_RET_VAL -1

/* Test case structure */
struct test_case_t {
	char 		 *modname;
	/* Expected errno. */
	int		 experrno;
	char		 *desc;
	/* Individual setup routine. */
	int		 (*setup)(void);
	/* Individual cleanup routine */
	void		 (*cleanup)(void);
};

char *TCID = "delete_module02";
static int exp_enos[] = { EPERM, EINVAL, ENOENT, EFAULT, ENAMETOOLONG, 0 };
static char nobody_uid[] = "nobody";
struct passwd *ltpuser;
static char longmodname[MODULE_NAME_LEN];
static int testno;
/* Name of the module */
static char modname[20];

char * bad_addr = 0;

static void setup(void);
static void cleanup(void);
static int setup1(void);
static void cleanup1(void);

struct test_case_t;

static struct test_case_t  tdat[] = {
		 { modname, ENOENT,
		 	"nonexistent module", NULL, NULL},
		 { NULLMODNAME, ENOENT,
		 	"null terminated module name", NULL, NULL},
		 { (char *) -1, EFAULT,
			"module name outside program's "
			"accessible address space", NULL, NULL},
		 { longmodname, ENOENT,
		 	"long module name", NULL, NULL},
		 { modname, EPERM,
		 	"non-superuser", setup1, cleanup1},
};

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

int
main(int argc, char **argv)
{
	int lc; 		 /* loop counter */
	char *msg; 		 /* message returned from parse_opts */

	/* parse standard options */
	if ((msg = parse_opts(argc, argv, NULL, NULL)) != NULL)
		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);

	setup();

	for (lc = 0; TEST_LOOPING(lc); lc++) {
		/* reset Tst_count in case we are looping */
		Tst_count = 0;

		for (testno = 0; testno < TST_TOTAL; ++testno) {
			if ((tdat[testno].setup) && (tdat[testno].setup())) {
		 		/* setup() failed, skip this test */
		 		continue;
		 	}
			/* Test the system call */
		 	TEST(delete_module(tdat[testno].modname));
		 	TEST_ERROR_LOG(TEST_ERRNO);
		 	printf("TEST_RETURN is %d, TEST_ERRNO is %d\n",
				TEST_RETURN, TEST_ERRNO);
		 	if ((TEST_RETURN == EXP_RET_VAL) &&
		 	     (TEST_ERRNO == tdat[testno].experrno) ) {
		 		tst_resm(TPASS, "Expected results for %s, "
		 				"errno: %d", tdat[testno].desc,
		 		 		TEST_ERRNO);
		 	} else {
				tst_resm(TFAIL, "Unexpected results for %s ; "
						"returned %d (expected %d), "
						"errno %d (expected %d)",
						tdat[testno].desc,
						TEST_RETURN, EXP_RET_VAL,
						TEST_ERRNO,
						tdat[testno].experrno);
			}
			if (tdat[testno].cleanup) {
				tdat[testno].cleanup();
			}
		}
	}
	cleanup();
	tst_exit();
}

int
setup1(void)
{
	/* Change effective user id to nodody */
	if (seteuid(ltpuser->pw_uid) == -1) {
		tst_resm(TBROK, "seteuid failed to set the effective"
				" uid to %d", ltpuser->pw_uid);
		return 1;
	}
	return 0;
}

void
cleanup1(void)
{
	/* Change effective user id to root */
	if (seteuid(0) == -1) {
		tst_brkm(TBROK, NULL, "seteuid failed to set the effective"
					  " uid to root");
	}
}

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

	tst_sig(NOFORK, DEF_HANDLER, cleanup);

	/* Check whether it is root  */
	if (geteuid() != 0) {
		tst_brkm(TBROK, NULL, "Must be root for this test!");

	}

	/*if (tst_kvercmp(2,5,48) >= 0)
		tst_brkm(TCONF, NULL, "This test will not work on "
					  "kernels after 2.5.48");
	 */

	/* Check for nobody_uid user id */
	if ((ltpuser = getpwnam(nobody_uid)) == NULL) {
		tst_brkm(TBROK, NULL, "Required user %s doesn't exists",
			 nobody_uid);
	}

	/* Initialize longmodname to LONGMODNAMECHAR character */
	memset(longmodname, LONGMODNAMECHAR, MODULE_NAME_LEN - 1);

	/* set the expected errnos... */
	TEST_EXP_ENOS(exp_enos);

	/* Pause if that option was specified
	 * TEST_PAUSE contains the code to fork the test with the -c option.
	 */
	TEST_PAUSE;

	/* Get unique module name for each child process */
	if (sprintf(modname, "%s_%d", BASEMODNAME, getpid()) <= 0) {
		tst_brkm(TBROK, NULL, "Failed to initialize module name");
	}
        bad_addr = mmap(0, 1, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
        if (bad_addr == MAP_FAILED) {
		tst_brkm(TBROK, cleanup, "mmap failed");
	}
	tdat[2].modname = bad_addr;

}

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