| /* Copyright (c) 2014 Red Hat, Inc. |
| * |
| * This program is free software: you can redistribute it and/or modify |
| * it under the terms of version 2 the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * 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, see <http://www.gnu.org/licenses/>. |
| *********************************************************************** |
| * File: sem_comm.c |
| * |
| * Description: |
| * 1. Clones two child processes with CLONE_NEWIPC flag, each child |
| * creates System V semaphore (sem) with the _identical_ key. |
| * 2. Child1 locks the semaphore. |
| * 3. Child2 locks the semaphore. |
| * 4. Locking the semaphore with the identical key but from two different |
| * IPC namespaces should not interfere with each other, so if child2 |
| * is able to lock the semaphore (after child1 locked it), test passes, |
| * otherwise test fails. |
| */ |
| |
| #define _GNU_SOURCE |
| #include <sys/ipc.h> |
| #include <sys/sem.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include "test.h" |
| #include "safe_macros.h" |
| #include "libclone.h" |
| #include "ipcns_helper.h" |
| |
| |
| #define TESTKEY 124426L |
| char *TCID = "sem_comm"; |
| int TST_TOTAL = 1; |
| struct tst_checkpoint checkpoint1; |
| struct tst_checkpoint checkpoint2; |
| |
| |
| static void cleanup(void) |
| { |
| tst_rmdir(); |
| } |
| |
| static void setup(void) |
| { |
| tst_require_root(NULL); |
| check_newipc(); |
| tst_tmpdir(); |
| TST_CHECKPOINT_CREATE(&checkpoint1); |
| TST_CHECKPOINT_CREATE(&checkpoint2); |
| } |
| |
| int chld1_sem(void *arg) |
| { |
| int id; |
| struct sembuf sm; |
| |
| id = semget(TESTKEY, 1, IPC_CREAT); |
| if (id == -1) { |
| perror("semget"); |
| return 2; |
| } |
| |
| if (semctl(id, 0, SETVAL, 1) == -1) { |
| perror("semctl"); |
| semctl(id, 0, IPC_RMID); |
| return 2; |
| } |
| |
| /* tell child2 to continue */ |
| TST_CHECKPOINT_SIGNAL_CHILD(NULL, &checkpoint1); |
| |
| /* wait for child2 to create the semaphore */ |
| TST_CHECKPOINT_CHILD_WAIT(&checkpoint2); |
| |
| sm.sem_num = 0; |
| sm.sem_op = -1; |
| sm.sem_flg = IPC_NOWAIT; |
| if (semop(id, &sm, 1) == -1) { |
| perror("semop"); |
| semctl(id, 0, IPC_RMID); |
| return 2; |
| } |
| |
| /* tell child2 to continue */ |
| TST_CHECKPOINT_SIGNAL_CHILD(NULL, &checkpoint1); |
| |
| /* wait for child2 to lock the semaphore */ |
| TST_CHECKPOINT_CHILD_WAIT(&checkpoint2); |
| |
| sm.sem_op = 1; |
| semop(id, &sm, 1); |
| |
| semctl(id, 0, IPC_RMID); |
| return 0; |
| } |
| |
| int chld2_sem(void *arg) |
| { |
| int id, rval = 0; |
| struct sembuf sm; |
| |
| /* wait for child1 to create the semaphore */ |
| TST_CHECKPOINT_CHILD_WAIT(&checkpoint1); |
| |
| id = semget(TESTKEY, 1, IPC_CREAT); |
| if (id == -1) { |
| perror("semget"); |
| return 2; |
| } |
| |
| if (semctl(id, 0, SETVAL, 1) == -1) { |
| perror("semctl"); |
| semctl(id, 0, IPC_RMID); |
| return 2; |
| } |
| |
| /* tell child1 to continue */ |
| TST_CHECKPOINT_SIGNAL_CHILD(NULL, &checkpoint2); |
| |
| /* wait for child1 to lock the semaphore */ |
| TST_CHECKPOINT_CHILD_WAIT(&checkpoint1); |
| |
| sm.sem_num = 0; |
| sm.sem_op = -1; |
| sm.sem_flg = IPC_NOWAIT; |
| if (semop(id, &sm, 1) == -1) { |
| if (errno == EAGAIN) { |
| rval = 1; |
| } else { |
| perror("semop"); |
| semctl(id, 0, IPC_RMID); |
| return 2; |
| } |
| } |
| |
| /* tell child1 to continue */ |
| TST_CHECKPOINT_SIGNAL_CHILD(NULL, &checkpoint2); |
| |
| sm.sem_op = 1; |
| semop(id, &sm, 1); |
| |
| semctl(id, 0, IPC_RMID); |
| return rval; |
| } |
| |
| static void test(void) |
| { |
| int status, ret = 0; |
| |
| ret = do_clone_unshare_test(T_CLONE, CLONE_NEWIPC, chld1_sem, NULL); |
| if (ret == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "clone failed"); |
| |
| ret = do_clone_unshare_test(T_CLONE, CLONE_NEWIPC, chld2_sem, NULL); |
| if (ret == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "clone failed"); |
| |
| |
| while (wait(&status) > 0) { |
| if (WIFEXITED(status) && WEXITSTATUS(status) == 1) |
| ret = 1; |
| if (WIFEXITED(status) && WEXITSTATUS(status) == 2) |
| tst_brkm(TBROK | TERRNO, cleanup, "error in child"); |
| if (WIFSIGNALED(status)) { |
| tst_resm(TFAIL, "child was killed with signal %s", |
| tst_strsig(WTERMSIG(status))); |
| return; |
| } |
| } |
| |
| if (ret) |
| tst_resm(TFAIL, "SysV sem: communication with identical keys" |
| " between namespaces"); |
| else |
| tst_resm(TPASS, "SysV sem: communication with identical keys" |
| " between namespaces"); |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| const char *msg; |
| int lc; |
| |
| msg = parse_opts(argc, argv, NULL, NULL); |
| if (msg != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| setup(); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) |
| test(); |
| |
| cleanup(); |
| tst_exit(); |
| } |