test/ipc/shmat/shmat02.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  *      shmat02.c
  23  *
  24  * DESCRIPTION
  25  *      shmat02 - check for EINVAL and EACCES errors
  26  *
  27  * ALGORITHM
  28  *      loop if that option was specified
  29  *        call shmat() using three invalid test cases
  30  *        check the errno value
  31  *          issue a PASS message if we get EINVAL or EACCES
  32  *        otherwise, the tests fails
  33  *          issue a FAIL message
  34  *      call cleanup
  35  *
  36  * USAGE:  <for command-line>
  37  *  shmat02 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
  38  *     where,  -c n : Run n copies concurrently.
  39  *             -e   : Turn on errno logging.
  40  *             -i n : Execute test n times.
  41  *             -I x : Execute test for x seconds.
  42  *             -P x : Pause for x seconds between iterations.
  43  *             -t   : Turn on syscall timing.
  44  *
  45  * HISTORY
  46  *      03/2001 - Written by Wayne Boyer
  47  *
  48  * RESTRICTIONS
  49  *      Must be ran as non-root
  50  */
  51
  52 #include "ipcshm.h"
  53 #include <pwd.h>
  54
  55 char *TCID = "shmat02";
  56 int TST_TOTAL = 3;
  57 extern int Tst_count;
  58 char nobody_uid[] = "nobody";
  59 struct passwd *ltpuser;
  60
  61
  62 int exp_enos[] = {EINVAL, EACCES, 0};   /* 0 terminated list of */
  63                                         /* expected errnos      */
  64
  65 int shm_id_1 = -1;
  66 int shm_id_2 = -1;
  67 int shm_id_3 = -1;
  68
  69 void    *addr;                          /* for result of shmat-call */
  70
  71 #define NADDR   0x40FFFEE5              /* a non alligned address value */
  72 struct test_case_t {
  73         int *shmid;
  74         void *addr;
  75         int error;
  76 } TC[] = {
  77         /* EINVAL - the shared memory ID is not valid */
  78         {&shm_id_1, 0, EINVAL},
  79
  80         /* EINVAL - the address is not page aligned and SHM_RND is not given */
  81         {&shm_id_2, (void *)NADDR, EINVAL},
  82
  83         /* EACCES - the shared memory resource has no read/write permission */
  84         {&shm_id_3, 0, EACCES}
  85 };
  86
  87 int main(int ac, char **av)
  88 {
  89         int lc;                         /* loop counter */
  90         char *msg;                      /* message returned from parse_opts */
  91         int i;
  92
  93         /* parse standard options */
  94         if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
  95                 tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
  96         }
  97
  98         setup();                        /* global setup */
  99
 100         /* The following loop checks looping state if -i option given */
 101
 102         for (lc = 0; TEST_LOOPING(lc); lc++) {
 103                 /* reset Tst_count in case we are looping */
 104                 Tst_count = 0;
 105
 106                 /* loop through the test cases */
 107                 for (i=0; i<TST_TOTAL; i++) {
 108                         /*
 109                          * make the call using the TEST() macro - attempt
 110                          * various invalid shared memory attaches
 111                          */
 112                         errno = 0;
 113                         addr = shmat(*(TC[i].shmid), (const void *)TC[i].addr, 0);
 114                         TEST_ERRNO = errno;
 115
 116                         if (addr != (void *)-1) {
 117                                 tst_resm(TFAIL, "call succeeded unexpectedly");
 118                                 continue;
 119                         }
 120
 121                         TEST_ERROR_LOG(TEST_ERRNO);
 122
 123                         if (TEST_ERRNO == TC[i].error) {
 124                                 tst_resm(TPASS, "expected failure - errno = "
 125                                          "%d : %s", TEST_ERRNO,
 126                                          strerror(TEST_ERRNO));
 127                         } else {
 128                                 tst_resm(TFAIL, "call failed with an "
 129                                          "unexpected error - %d : %s",
 130                                          TEST_ERRNO, strerror(TEST_ERRNO));
 131
 132                         }
 133                 }
 134         }
 135
 136         cleanup();
 137
 138         /*NOTREACHED*/
 139         return(0);
 140 }
 141
 142 /*
 143  * setup() - performs all the ONE TIME setup for this test.
 144  */
 145 void
 146 setup(void)
 147 {
 148         /* Switch to nobody user for correct error code collection */
 149         if (geteuid() != 0) {
 150                 tst_brkm(TBROK, tst_exit, "Test must be run as root");
 151         }
 152
 153         /* capture signals */
 154         tst_sig(NOFORK, DEF_HANDLER, cleanup);
 155
 156         /* Set up the expected error numbers for -e option */
 157         TEST_EXP_ENOS(exp_enos);
 158
 159         /* Pause if that option was specified */
 160         TEST_PAUSE;
 161
 162         /*
 163          * Create a temporary directory and cd into it.
 164          * This helps to ensure that a unique msgkey is created.
 165          * See ../lib/libipc.c for more information.
 166          */
 167         tst_tmpdir();
 168
 169         ltpuser = getpwnam(nobody_uid);
 170         if (seteuid(ltpuser->pw_uid) == -1) {
 171                 tst_resm(TINFO, "setuid failed to "
 172                                 "to set the effective uid to %d",
 173                                 ltpuser->pw_uid);
 174                 perror("seteuid");
 175         }
 176
 177         /* get an IPC resource key */
 178         shmkey = getipckey();
 179
 180         /* create a shared memory resource with read and write permissions */
 181         /* also post increment the shmkey for the next shmget call */
 182         if ((shm_id_2 = shmget(shmkey++, INT_SIZE, SHM_RW | IPC_CREAT |
 183              IPC_EXCL)) == -1) {
 184                 tst_brkm(TBROK, cleanup, "Failed to create shared memory "
 185                          "resource #1 in setup()");
 186         }
 187
 188         /* create a shared memory resource without read and write permissions */
 189         if ((shm_id_3 = shmget(shmkey, INT_SIZE, IPC_CREAT | IPC_EXCL)) == -1) {
 190                 tst_brkm(TBROK, cleanup, "Failed to create shared memory "
 191                          "resource #2 in setup()");
 192         }
 193 }
 194
 195 /*
 196  * cleanup() - performs all the ONE TIME cleanup for this test at completion
 197  *             or premature exit.
 198  */
 199 void
 200 cleanup(void)
 201 {
 202         /* if they exist, remove the shared memory resources */
 203         rm_shm(shm_id_2);
 204         rm_shm(shm_id_3);
 205
 206         if (seteuid(0) == -1) {
 207                 tst_resm(TINFO, "setuid failed to "
 208                                 "to set the effective uid to root");
 209                 perror("seteuid");
 210         }
 211
 212         /* Remove the temporary directory */
 213         tst_rmdir();
 214
 215         /*
 216          * print timing stats if that option was specified.
 217          * print errno log if that option was specified.
 218          */
 219         TEST_CLEANUP;
 220
 221         /* exit with return code appropriate for results */
 222         tst_exit();
 223 }
 224