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      1 /*
      2 * Copyright (c) International Business Machines Corp., 2007
      3 * This program is free software; you can redistribute it and/or modify
      4 * it under the terms of the GNU General Public License as published by
      5 * the Free Software Foundation; either version 2 of the License, or
      6 * (at your option) any later version.
      7 * This program is distributed in the hope that it will be useful,
      8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
      9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
     10 * the GNU General Public License for more details.
     11 * You should have received a copy of the GNU General Public License
     12 * along with this program; if not, write to the Free Software
     13 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     14 *
     15 ***************************************************************************
     16 
     17 * File: pidns04.c
     18 *
     19 * Description:
     20 *  The pidns04.c testcase builds into the ltp framework to verify
     21 *  the basic functionality of PID Namespace.
     22 *
     23 * Verify that:
     24 * 1. When parent clone a process with flag CLONE_NEWPID, the process ID of
     25 * child should be one.
     26 *
     27 * 2. When parent clone a process with flag CLONE_NEWPID, the parent process ID
     28 * of should be zero.
     29 *
     30 * 3. The container init process (one), should not get killed by the SIGKILL in
     31 * the childNS
     32 *
     33 * Total Tests:
     34 *
     35 * Test Name: pidns04
     36 *
     37 * Test Assertion & Strategy:
     38 *
     39 * From main() clone a new child process with passing the clone_flag as
     40 * CLONE_NEWPID.
     41 * The container init, should not get killed by the SIGKILL inside the child NS.
     42 * Usage: <for command-line>
     43 * pidns04
     44 *
     45 * History:
     46 *
     47 * FLAG DATE     	NAME	   			DESCRIPTION
     48 * 08/10/08      Veerendra C <vechandr (at) in.ibm.com> Verifies killing of cont init.
     49 *
     50 *******************************************************************************/
     51 #define _GNU_SOURCE 1
     52 #include <sys/wait.h>
     53 #include <assert.h>
     54 #include <stdio.h>
     55 #include <stdlib.h>
     56 #include <unistd.h>
     57 #include <string.h>
     58 #include <errno.h>
     59 #define CLEANUP cleanup
     60 #include "pidns_helper.h"
     61 #include "test.h"
     62 
     63 #define INIT_PID	1
     64 #define CHILD_PID       1
     65 #define PARENT_PID      0
     66 
     67 char *TCID = "pidns04";
     68 int TST_TOTAL = 1;
     69 int fd[2];
     70 
     71 /*
     72  * child_fn1() - Inside container
     73 */
     74 static int child_fn1(void *ttype)
     75 {
     76 	int exit_val;
     77 	pid_t cpid, ppid;
     78 	cpid = getpid();
     79 	ppid = getppid();
     80 	char mesg[] = "I was not killed !";
     81 	/* Child process closes up read side of pipe */
     82 	close(fd[0]);
     83 
     84 	/* Comparing the values to make sure pidns is created correctly */
     85 	if ((cpid == CHILD_PID) && (ppid == PARENT_PID)) {
     86 		printf("PIDNS test is running inside container\n");
     87 		kill(INIT_PID, SIGKILL);
     88 		/* Verifying whether the container init is not killed, "
     89 		   If so writing into the pipe created in the parent NS" */
     90 
     91 		/* Send "mesg" through the write side of pipe */
     92 		write(fd[1], mesg, (strlen(mesg) + 1));
     93 		exit_val = 0;
     94 	} else {
     95 		printf("got unexpected result of cpid=%d ppid=%d\n",
     96 		       cpid, ppid);
     97 		exit_val = 1;
     98 	}
     99 	exit(exit_val);
    100 }
    101 
    102 static void setup(void)
    103 {
    104 	tst_require_root();
    105 	check_newpid();
    106 }
    107 
    108 int main(int argc, char *argv[])
    109 {
    110 	int nbytes, status;
    111 	char readbuffer[80];
    112 
    113 	setup();
    114 
    115 	pipe(fd);
    116 	TEST(do_clone_unshare_test(T_CLONE, CLONE_NEWPID, child_fn1, NULL));
    117 	if (TEST_RETURN == -1) {
    118 		tst_brkm(TFAIL | TTERRNO, CLEANUP, "clone failed");
    119 	} else if (wait(&status) == -1) {
    120 		tst_brkm(TFAIL | TERRNO, CLEANUP, "wait failed");
    121 	}
    122 
    123 	/* Parent process closes up write side of pipe */
    124 	close(fd[1]);
    125 	/* Read in a string from the pipe */
    126 	nbytes = read(fd[0], readbuffer, sizeof(readbuffer));
    127 
    128 	if (0 <= nbytes) {
    129 		tst_resm(TPASS, "Container init : %s", readbuffer);
    130 	} else {
    131 		tst_brkm(TFAIL, CLEANUP,
    132 			 "Container init is killed by SIGKILL !!!");
    133 	}
    134 
    135 	if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
    136 		tst_resm(TFAIL, "Container init pid exited abnormally");
    137 	} else if (WIFSIGNALED(status)) {
    138 		tst_resm(TFAIL, "Container init pid got killed by signal %d",
    139 			 WTERMSIG(status));
    140 	}
    141 	CLEANUP();
    142 
    143 	tst_exit();
    144 
    145 }
    146 
    147 static void cleanup(void)
    148 {
    149 	close(fd[0]);
    150 }
    151