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@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 */
child_fn1(void * ttype)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
setup(void)102 static void setup(void)
103 {
104 tst_require_root();
105 check_newpid();
106 }
107
main(int argc,char * argv[])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
cleanup(void)147 static void cleanup(void)
148 {
149 close(fd[0]);
150 }
151