test/ipc/shmat/shmat03.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  *      shmat03.c
  23  *
  24  * DESCRIPTION
  25  *      shmat03 - test for EACCES error
  26  *
  27  * ALGORITHM
  28  *      create a shared memory segment with root only read & write permissions
  29  *      fork a child process
  30  *      if child
  31  *        set the ID of the child process to that of "nobody"
  32  *        loop if that option was specified
  33  *          call shmat() using the TEST() macro
  34  *          check the errno value
  35  *            issue a PASS message if we get EACCES
  36  *          otherwise, the tests fails
  37  *            issue a FAIL message
  38  *        call cleanup
  39  *      if parent
  40  *        wait for child to exit
  41  *        remove the shared memory segment
  42  *
  43  * USAGE:  <for command-line>
  44  *  shmat03 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
  45  *     where,  -c n : Run n copies concurrently.
  46  *             -e   : Turn on errno logging.
  47  *             -i n : Execute test n times.
  48  *             -I x : Execute test for x seconds.
  49  *             -P x : Pause for x seconds between iterations.
  50  *             -t   : Turn on syscall timing.
  51  *
  52  * HISTORY
  53  *      03/2001 - Written by Wayne Boyer
  54  *
  55  * RESTRICTIONS
  56  *      test must be run at root
  57  */
  58
  59 #include "ipcshm.h"
  60
  61 char *TCID = "shmat03";
  62 int TST_TOTAL = 1;
  63 extern int Tst_count;
  64
  65 int exp_enos[] = {EACCES, 0};   /* 0 terminated list of expected errnos */
  66
  67 int shm_id_1 = -1;
  68
  69 void    *addr;                  /* for result of shmat-call */
  70
  71 uid_t ltp_uid;
  72 char *ltp_user = "nobody";
  73
  74 int main(int ac, char **av)
  75 {
  76         char *msg;                      /* message returned from parse_opts */
  77         int pid;
  78         void do_child(void);
  79
  80         /* parse standard options */
  81         if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
  82                 tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
  83         }
  84
  85         setup();                        /* global setup */
  86
  87         if ((pid = FORK_OR_VFORK()) == -1) {
  88                 tst_brkm(TBROK, cleanup, "could not fork");
  89         }
  90
  91         if (pid == 0) {         /* child */
  92                 /* set the user ID of the child to the non root user */
  93                 if (setuid(ltp_uid) == -1) {
  94                         tst_resm(TBROK, "setuid() failed");
  95                         exit(1);
  96                 }
  97
  98                 do_child();
  99
 100         } else {                /* parent */
 101                 /* wait for the child to return */
 102                 if (waitpid(pid, NULL, 0) == -1) {
 103                         tst_brkm(TBROK, cleanup, "waitpid failed");
 104                 }
 105
 106                 /* if it exists, remove the shared memory resource */
 107                 rm_shm(shm_id_1);
 108
 109                 /* Remove the temporary directory */
 110                 tst_rmdir();
 111         }
 112
 113         cleanup();
 114         return(0);
 115 }
 116
 117 /*
 118  * do_child - make the TEST call as the child process
 119  */
 120 void
 121 do_child(void)
 122 {
 123         int lc;
 124
 125         /* The following loop checks looping state if -i option given */
 126
 127         for (lc = 0; TEST_LOOPING(lc); lc++) {
 128                 /* reset Tst_count in case we are looping */
 129                 Tst_count = 0;
 130
 131                 /*
 132                  * use TEST macro to make the call
 133                  */
 134                 errno = 0;
 135                 addr = shmat(shm_id_1, (const void *)0, 0);
 136                 TEST_ERRNO = errno;
 137
 138                 if (addr != (char *)-1) {
 139                         tst_resm(TFAIL, "call succeeded when error expected");
 140                         continue;
 141                 }
 142
 143                 TEST_ERROR_LOG(TEST_ERRNO);
 144
 145                 switch(TEST_ERRNO) {
 146                 case EACCES:
 147                         tst_resm(TPASS, "expected failure - errno = "
 148                                  "%d : %s", TEST_ERRNO,
 149                                  strerror(TEST_ERRNO));
 150                         break;
 151                 default:
 152                         tst_resm(TFAIL, "call failed with an "
 153                                  "unexpected error - %d : %s",
 154                                  TEST_ERRNO, strerror(TEST_ERRNO));
 155                         break;
 156                 }
 157         }
 158 }
 159
 160 /*
 161  * setup() - performs all the ONE TIME setup for this test.
 162  */
 163 void
 164 setup(void)
 165 {
 166         /* check for root as process owner */
 167         check_root();
 168
 169         /* capture signals */
 170         tst_sig(FORK, DEF_HANDLER, cleanup);
 171
 172         /* Set up the expected error numbers for -e option */
 173         TEST_EXP_ENOS(exp_enos);
 174
 175         /* Pause if that option was specified */
 176         TEST_PAUSE;
 177
 178         /*
 179          * Create a temporary directory and cd into it.
 180          * This helps to ensure that a unique msgkey is created.
 181          * See ../lib/libipc.c for more information.
 182          */
 183         tst_tmpdir();
 184
 185         /* get an IPC resource key */
 186         shmkey = getipckey();
 187
 188         /* create a shared memory segment with read and write permissions */
 189         if ((shm_id_1 = shmget(shmkey, SHM_SIZE,
 190                                SHM_RW | IPC_CREAT | IPC_EXCL)) == -1) {
 191                 tst_brkm(TBROK, cleanup, "Failed to create shared memory "
 192                          "segment in setup");
 193         }
 194
 195         /* get the userid for a non root user */
 196         ltp_uid = getuserid(ltp_user);
 197 }
 198
 199 /*
 200  * cleanup() - performs all the ONE TIME cleanup for this test at completion
 201  *             or premature exit.
 202  */
 203 void
 204 cleanup(void)
 205 {
 206         /*
 207          * print timing stats if that option was specified.
 208          * print errno log if that option was specified.
 209          */
 210         TEST_CLEANUP;
 211
 212         /* exit with return code appropriate for results */
 213         tst_exit();
 214 }
 215