testcases/kernel/syscalls/setgid/setgid02.c

   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 /*
  21  * NAME
  22  *      setgid02.c
  23  *
  24  * DESCRIPTION
  25  *      Testcase to ensure that the setgid() system call sets errno to EPERM
  26  *
  27  * ALGORITHM
  28  *      Call setgid() to set the gid to that of root. Run this test as
  29  *      ltpuser1, and expect to get EPERM
  30  *
  31  * USAGE:  <for command-line>
  32  *  setgid02 [-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 a nonroot user
  45  */
  46 #include <pwd.h>
  47 #include <errno.h>
  48 #include <test.h>
  49 #include <usctest.h>
  50
  51 TCID_DEFINE(setgid02);
  52 int TST_TOTAL = 1;
  53 extern int Tst_count;
  54
  55 char root[] = "root";
  56 char nobody_uid[] = "nobody";
  57 char nobody_gid[] = "nobody";
  58 struct passwd *ltpuser;
  59
  60
  61 void setup(void);
  62 void cleanup(void);
  63
  64 #include "compat_16.h"
  65
  66 int exp_enos[] = {EPERM, 0};
  67
  68 int main(int ac, char **av)
  69 {
  70         struct passwd *getpwnam(), *rootpwent;
  71
  72         int lc;                         /* loop counter */
  73         char *msg;                      /* message returned by parse_opts */
  74
  75         /* parse standard options */
  76         if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
  77                 tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg);
  78                 /*NOTREACHED*/
  79         }
  80
  81         setup();
  82
  83         TEST_EXP_ENOS(exp_enos);
  84
  85         /* check looping state if -i option is given */
  86         for (lc = 0; TEST_LOOPING(lc); lc++) {
  87                 /* reset Tst_count in case we are looping */
  88                 Tst_count = 0;
  89
  90
  91                 if ((rootpwent = getpwnam(root)) == NULL) {
  92                         tst_brkm(TBROK, cleanup, "getpwnam failed for user id "
  93                                  "%s", root);
  94                 }
  95
  96                 if (!GID_SIZE_CHECK(rootpwent->pw_gid)) {
  97                  tst_brkm(TBROK,
  98                           cleanup,
  99                           "gid for `%s' is too large for testing setgid16",
 100                           root);
 101                 }
 102
 103                 TEST(SETGID(rootpwent->pw_gid));
 104
 105                 if (TEST_RETURN != -1) {
 106                         tst_resm(TFAIL, "call succeeded unexpectedly");
 107                         continue;
 108                 }
 109
 110                 TEST_ERROR_LOG(TEST_ERRNO);
 111
 112                 if (TEST_ERRNO != EPERM) {
 113                         tst_resm(TFAIL, "setgid set invalid errno, expected: "
 114                                  "EPERM, got: %d\n", TEST_ERRNO);
 115                 } else {
 116                         tst_resm(TPASS, "setgid returned EPERM");
 117                 }
 118         }
 119         cleanup();
 120
 121         /*NOTREACHED*/
 122         return(0);
 123 }
 124
 125 /*
 126  * setup() - performs all ONE TIME setup for this test.
 127  */
 128 void
 129 setup()
 130 {
 131 /* Switch to nobody user for correct error code collection */
 132         if (geteuid() != 0) {
 133                 tst_brkm(TBROK, tst_exit, "Test must be run as root");
 134         }
 135         ltpuser = getpwnam(nobody_uid);
 136
 137          if (!GID_SIZE_CHECK(ltpuser->pw_gid)) {
 138                  tst_brkm(TBROK,
 139                           cleanup,
 140                           "gid for `%s' is too large for testing setgid16",
 141                           nobody_gid);
 142          }
 143
 144          if (setgid(ltpuser->pw_gid) == -1) {
 145                 tst_resm(TINFO, "setgid failed to "
 146                          "to set the effective gid to %d",
 147                          ltpuser->pw_gid);
 148                 perror("setgid");
 149          }
 150
 151          if (setuid(ltpuser->pw_uid) == -1) {
 152                 tst_resm(TINFO, "setuid failed to "
 153                          "to set the effective uid to %d",
 154                          ltpuser->pw_uid);
 155                 perror("setuid");
 156          }
 157
 158
 159         /* capture signals */
 160         tst_sig(NOFORK, DEF_HANDLER, cleanup);
 161
 162         /* Pause if that option was specified */
 163         TEST_PAUSE;
 164 }
 165
 166 /*
 167  * cleanup() - performs all ONE TIME cleanup for this test at
 168  *             completion or premature exit.
 169  */
 170 void
 171 cleanup()
 172 {
 173         /*
 174          * print timing stats if that option was specified.
 175          * print errno log if that option was specified.
 176          */
 177         TEST_CLEANUP;
 178
 179         /* exit with return code appropriate for results */
 180         tst_exit();
 181 }