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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  *	sched_setscheduler01.c
     23  *
     24  * DESCRIPTION
     25  *	Testcase to test whether sched_setscheduler(2) sets the errnos
     26  *	correctly.
     27  *
     28  * ALGORITHM
     29  *	1.	Call sched_setscheduler as a non-root uid, and expect EPERM
     30  *	to be returned.
     31  *
     32  * USAGE:  <for command-line>
     33  *  sched_setscheduler02 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
     34  *     where,  -c n : Run n copies concurrently.
     35  *             -e   : Turn on errno logging.
     36  *             -i n : Execute test n times.
     37  *             -I x : Execute test for x seconds.
     38  *             -P x : Pause for x seconds between iterations.
     39  *             -t   : Turn on syscall timing.
     40  *
     41  * HISTORY
     42  *	07/2001 Ported by Wayne Boyer
     43  *
     44  * RESTRICTIONS
     45  *	Must run test as root.
     46  */
     47 #include <stdio.h>
     48 #include <errno.h>
     49 #include <sched.h>
     50 #include <pwd.h>
     51 #include <sys/types.h>
     52 #include <sys/wait.h>
     53 
     54 #include "test.h"
     55 #include "safe_macros.h"
     56 
     57 #define SCHED_INVALID	99
     58 #define INVALID_PID	999999
     59 
     60 char *TCID = "sched_setscheduler02";
     61 int TST_TOTAL = 1;
     62 
     63 void setup(void);
     64 void cleanup(void);
     65 
     66 static uid_t nobody_uid;
     67 
     68 int main(int ac, char **av)
     69 {
     70 	int lc;
     71 	pid_t pid;
     72 	struct sched_param param;
     73 	int status;
     74 
     75 	tst_parse_opts(ac, av, NULL, NULL);
     76 
     77 	setup();
     78 
     79 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     80 
     81 		/* reset tst_count in case we are looping */
     82 		tst_count = 0;
     83 
     84 		if ((pid = FORK_OR_VFORK()) == -1) {
     85 			tst_brkm(TBROK, cleanup, "fork failed");
     86 		}
     87 
     88 		if (pid == 0) {	/* child */
     89 			param.sched_priority = 1;
     90 
     91 			if (seteuid(nobody_uid) == -1) {
     92 				tst_brkm(TBROK, cleanup, "seteuid() failed");
     93 			}
     94 
     95 			TEST(sched_setscheduler(pid, SCHED_FIFO, &param));
     96 
     97 			if (TEST_ERRNO) {
     98 			}
     99 
    100 			if (TEST_RETURN != -1) {
    101 				tst_resm(TFAIL, "sched_setscheduler(2) passed "
    102 					 "with non root priveledges");
    103 			} else if (TEST_ERRNO != EPERM) {
    104 				tst_resm(TFAIL, "Expected EPERM, got %d",
    105 					 TEST_ERRNO);
    106 			} else {
    107 				tst_resm(TPASS, "got EPERM");
    108 			}
    109 		} else {	/* parent */
    110 			/* let the child carry on */
    111 			wait(&status);
    112 			if (WIFEXITED(status) != 0) {	/* Exit with errors */
    113 				exit(WEXITSTATUS(status));
    114 			} else {
    115 				exit(0);
    116 			}
    117 		}
    118 
    119 		if (seteuid(0) == -1) {
    120 			tst_brkm(TBROK, cleanup, "seteuid(0) failed");
    121 		}
    122 	}
    123 	cleanup();
    124 	tst_exit();
    125 
    126 }
    127 
    128 /*
    129  * setup() - performs all ONE TIME setup for this test.
    130  */
    131 void setup(void)
    132 {
    133 	struct passwd *pw;
    134 
    135 	tst_require_root();
    136 
    137 	pw = SAFE_GETPWNAM(NULL, "nobody");
    138 	nobody_uid = pw->pw_uid;
    139 
    140 	tst_sig(FORK, DEF_HANDLER, cleanup);
    141 
    142 	TEST_PAUSE;
    143 }
    144 
    145 /*
    146  * cleanup() - performs all ONE TIME cleanup for this test at
    147  *	       completion or premature exit.
    148  */
    149 void cleanup(void)
    150 {
    151 
    152 }
    153