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      1 /*
      2  *
      3  *   Copyright (c) International Business Machines  Corp., 2001
      4  *
      5  *   This program is free software;  you can redistribute it and/or modify
      6  *   it under the terms of the GNU General Public License as published by
      7  *   the Free Software Foundation; either version 2 of the License, or
      8  *   (at your option) any later version.
      9  *
     10  *   This program is distributed in the hope that it will be useful,
     11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
     12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
     13  *   the GNU General Public License for more details.
     14  *
     15  *   You should have received a copy of the GNU General Public License
     16  *   along with this program;  if not, write to the Free Software
     17  *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     18  */
     19 
     20 /*
     21  * NAME
     22  * 	chroot01.c
     23  *
     24  * DESCRIPTION
     25  *	Testcase to check the whether chroot sets errno to EPERM.
     26  *
     27  * ALGORITHM
     28  *	As a non-root user attempt to perform chroot() to a directory. The
     29  *	chroot() call should fail with EPERM
     30  *
     31  * USAGE:  <for command-line>
     32  *  chroot01 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
     33  *     where,  -c n : Run n copies concurrently.
     34  *             -e   : Turn on errno logging.
     35  *             -i n : Execute test n times.
     36  *             -I x : Execute test for x seconds.
     37  *             -P x : Pause for x seconds between iterations.
     38  *             -t   : Turn on syscall timing.
     39  *
     40  * HISTORY
     41  *	07/2001 Ported by Wayne Boyer
     42  *
     43  * RESTRICTIONS
     44  * 	Must be run as non-root user.
     45  */
     46 
     47 #include <stdio.h>
     48 #include <errno.h>
     49 #include "test.h"
     50 #include "safe_macros.h"
     51 #include <pwd.h>
     52 
     53 char *TCID = "chroot01";
     54 int TST_TOTAL = 1;
     55 int fail;
     56 
     57 char *path;
     58 
     59 char nobody_uid[] = "nobody";
     60 struct passwd *ltpuser;
     61 
     62 void setup(void);
     63 void cleanup(void);
     64 
     65 int main(int ac, char **av)
     66 {
     67 	int lc;
     68 
     69 	tst_parse_opts(ac, av, NULL, NULL);
     70 
     71 	setup();
     72 
     73 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     74 
     75 		tst_count = 0;
     76 
     77 		TEST(chroot(path));
     78 
     79 		if (TEST_RETURN != -1)
     80 			tst_resm(TFAIL, "call succeeded unexpectedly");
     81 		else if (errno != EPERM)
     82 			tst_resm(TFAIL | TTERRNO, "chroot failed unexpectedly");
     83 		else
     84 			tst_resm(TPASS, "chroot set errno to EPERM.");
     85 	}
     86 	cleanup();
     87 
     88 	tst_exit();
     89 
     90 }
     91 
     92 void setup(void)
     93 {
     94 	tst_require_root();
     95 
     96 	tst_tmpdir();
     97 	path = tst_get_tmpdir();
     98 
     99 	if ((ltpuser = getpwnam(nobody_uid)) == NULL)
    100 		tst_brkm(TBROK | TERRNO, cleanup,
    101 			 "getpwnam(\"nobody\") failed");
    102 
    103 	SAFE_SETEUID(cleanup, ltpuser->pw_uid);
    104 
    105 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    106 
    107 	TEST_PAUSE;
    108 }
    109 
    110 void cleanup(void)
    111 {
    112 	SAFE_SETEUID(NULL, 0);
    113 
    114 	free(path);
    115 	tst_rmdir();
    116 }
    117