| /* |
| * |
| * Copyright (c) International Business Machines Corp., 2004 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| /* |
| * NAME |
| * hugeshmctl03.c |
| * |
| * DESCRIPTION |
| * hugeshmctl03 - check for EACCES, and EPERM errors |
| * |
| * ALGORITHM |
| * create a large shared memory segment with root only read & write permissions |
| * fork a child process |
| * if child |
| * set the ID of the child process to that of "ltpuser1" |
| * call do_child() |
| * loop if that option was specified |
| * call shmctl() using three different invalid cases |
| * check the errno value |
| * issue a PASS message if we get EACCES or EPERM |
| * otherwise, the tests fails |
| * issue a FAIL message |
| * call cleanup |
| * if parent |
| * wait for child to exit |
| * remove the large shared memory segment |
| * |
| * USAGE: <for command-line> |
| * hugeshmctl03 [-c n] [-e] [-i n] [-I x] [-P x] [-t] |
| * where, -c n : Run n copies concurrently. |
| * -e : Turn on errno logging. |
| * -i n : Execute test n times. |
| * -I x : Execute test for x seconds. |
| * -P x : Pause for x seconds between iterations. |
| * -t : Turn on syscall timing. |
| * |
| * HISTORY |
| * 03/2001 - Written by Wayne Boyer |
| * 04/2004 - Updated by Robbie Williamson |
| * |
| * RESTRICTIONS |
| * test must be run as root |
| */ |
| |
| #include "ipcshm.h" |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include "system_specific_hugepages_info.h" |
| |
| char *TCID = "hugeshmctl03"; |
| int TST_TOTAL = 3; |
| extern int Tst_count; |
| unsigned long huge_pages_shm_to_be_allocated; |
| |
| int exp_enos[] = {EACCES, EPERM, 0}; /* 0 terminated list of */ |
| /* expected errnos */ |
| int shm_id_1 = -1; |
| |
| uid_t ltp_uid; |
| char *ltp_user = "nobody"; |
| |
| struct shmid_ds buf; |
| |
| struct test_case_t { |
| int *shmid; |
| int cmd; |
| struct shmid_ds *sbuf; |
| int error; |
| } TC[] = { |
| /* EACCES - child has no read permission for segment */ |
| {&shm_id_1, IPC_STAT, &buf, EACCES}, |
| |
| /* EPERM - IPC_SET - child doesn't have permission to change segment */ |
| {&shm_id_1, IPC_SET, &buf, EPERM}, |
| |
| /* EPERM - IPC_RMID - child can not remove the segment */ |
| {&shm_id_1, IPC_RMID, &buf, EPERM}, |
| }; |
| |
| int main(int ac, char **av) |
| { |
| char *msg; /* message returned from parse_opts */ |
| int pid; |
| void do_child(void); |
| |
| /* parse standard options */ |
| if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){ |
| tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg); |
| } |
| |
| if ( get_no_of_hugepages() <= 0 || hugepages_size() <= 0 ) |
| tst_brkm(TCONF, cleanup, "Not enough available Hugepages"); |
| else |
| huge_pages_shm_to_be_allocated = ( get_no_of_hugepages() * hugepages_size() * 1024) / 2 ; |
| |
| setup(); /* global setup */ |
| |
| if ((pid = fork()) == -1) { |
| tst_brkm(TBROK, cleanup, "could not fork"); |
| } |
| |
| if (pid == 0) { /* child */ |
| /* set the user ID of the child to the non root user */ |
| if (setuid(ltp_uid) == -1) { |
| tst_resm(TBROK, "setuid() failed"); |
| exit(1); |
| } |
| |
| do_child(); |
| } else { |
| /* wait for the child to return */ |
| if (waitpid(pid, NULL, 0) == -1) { |
| tst_brkm(TBROK, cleanup, "waitpid failed"); |
| } |
| |
| /* if it exists, remove the shared memory resource */ |
| rm_shm(shm_id_1); |
| |
| /* Remove the temporary directory */ |
| tst_rmdir(); |
| } |
| |
| cleanup (); |
| return 0; |
| } |
| |
| /* |
| * do_child - make the call as the child process |
| */ |
| void |
| do_child() |
| { |
| int i, lc; |
| |
| /* The following loop checks looping state if -i option given */ |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| /* reset Tst_count in case we are looping */ |
| Tst_count = 0; |
| |
| /* loop through the test cases */ |
| for (i=0; i<TST_TOTAL; i++) { |
| /* |
| * use the TEST() macro to make the call |
| */ |
| |
| TEST(shmctl(*(TC[i].shmid), TC[i].cmd, TC[i].sbuf)); |
| |
| if (TEST_RETURN != -1) { |
| tst_resm(TFAIL, "call succeeded unexpectedly"); |
| continue; |
| } |
| |
| TEST_ERROR_LOG(TEST_ERRNO); |
| |
| if (TEST_ERRNO == TC[i].error) { |
| tst_resm(TPASS, "expected failure - errno = " |
| "%d : %s", TEST_ERRNO, |
| strerror(TEST_ERRNO)); |
| } else { |
| tst_resm(TFAIL, "call failed with an " |
| "unexpected error - %d : %s", |
| TEST_ERRNO, strerror(TEST_ERRNO)); |
| } |
| } |
| } |
| } |
| |
| /* |
| * setup() - performs all the ONE TIME setup for this test. |
| */ |
| void |
| setup(void) |
| { |
| /* check for root as process owner */ |
| check_root(); |
| |
| /* capture signals */ |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| |
| /* Set up the expected error numbers for -e option */ |
| TEST_EXP_ENOS(exp_enos); |
| |
| /* Pause if that option was specified */ |
| TEST_PAUSE; |
| |
| /* |
| * Create a temporary directory and cd into it. |
| * This helps to ensure that a unique msgkey is created. |
| * See ../lib/libipc.c for more information. |
| */ |
| tst_tmpdir(); |
| |
| /* get an IPC resource key */ |
| shmkey = getipckey(); |
| |
| /* create a shared memory segment with read and write permissions */ |
| if ((shm_id_1 = shmget(shmkey, huge_pages_shm_to_be_allocated, SHM_HUGETLB | IPC_CREAT | IPC_EXCL | |
| SHM_RW)) == -1) { |
| tst_brkm(TBROK, cleanup, "couldn't create shared memory " |
| "segment in setup()"); |
| } |
| |
| /* get the userid for a non root user */ |
| ltp_uid = getuserid(ltp_user); |
| } |
| |
| /* |
| * cleanup() - performs all the ONE TIME cleanup for this test at completion |
| * or premature exit. |
| */ |
| void |
| cleanup(void) |
| { |
| /* |
| * print timing stats if that option was specified. |
| * print errno log if that option was specified. |
| */ |
| TEST_CLEANUP; |
| |
| /* exit with return code appropriate for results */ |
| tst_exit(); |
| } |
| |