1 /*
2 * Copyright (c) International Business Machines Corp., 2008
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 * Description:
17 * Testcase tries killing of the parent namespace pid by the container-init.
18 * It also tries killing of non-existent PID, by the container-init.
19 * Returns Success if Unable to kill, and proper error number is set.
20 * else Returns Failure
21 *
22 * Steps:
23 * 1. Parent process clone a process with flag CLONE_NEWPID
24 * 2. The pid of the parent namespace is passed to the container.
25 * 3. Container receieves the PID and passes SIGKILL to this PID.
26 * 4. If kill() is unsuccessful and the errno is set to 'No Such process'
27 * then sets PASS
28 * else,
29 * sets FAIL
30 * 5. It also verifies by passing SIGKILL to FAKE_PID
31 * 6. If kill() is unsuccessful and the errno is set to 'No Such process'
32 * then sets PASS
33 * else,
34 * sets FAIL
35 *
36 *******************************************************************************/
37 #define _GNU_SOURCE 1
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <sys/wait.h>
41 #include <assert.h>
42 #include <unistd.h>
43 #include <errno.h>
44 #include <signal.h>
45 #include "pidns_helper.h"
46 #include "test.h"
47
48 #define CINIT_PID 1
49 #define PARENT_PID 0
50 #define FAKE_PID -1
51
52 char *TCID = "pidns06";
53 int TST_TOTAL = 1;
54
55 /*
56 * kill_pid_in_childfun()
57 * Cont-init tries to kill the parent-process using parent's global Pid.
58 * Also checks passing SIGKILL to non existent PID in the container.
59 */
kill_pid_in_childfun(void * vtest)60 static int kill_pid_in_childfun(void *vtest)
61 {
62 int cpid, ppid, *par_pid;
63 int ret = 0;
64 cpid = getpid();
65 ppid = getppid();
66 par_pid = (int *)vtest;
67
68 /* Checking the values to make sure pidns is created correctly */
69 if (cpid != CINIT_PID || ppid != PARENT_PID) {
70 printf("Unexpected result for Container: init "
71 "pid=%d ppid=%d\n", cpid, ppid);
72 exit(1);
73 }
74
75 /*
76 * While trying kill() of the pid of the parent namespace..
77 * Check to see if the errno was set to the expected, value of 3 : ESRCH
78 */
79 ret = kill(*par_pid, SIGKILL);
80 if (ret == -1 && errno == ESRCH) {
81 printf("Container: killing parent pid=%d failed as expected "
82 "with ESRCH\n", *par_pid);
83 } else {
84 printf("Container: killing parent pid=%d, didn't fail as "
85 "expected with ESRCH (%d) and a return value of -1. Got "
86 "%d (\"%s\") and a return value of %d instead.\n",
87 *par_pid, ESRCH, errno, strerror(errno), ret);
88 exit(1);
89 }
90 /*
91 * While killing non-existent pid in the container,
92 * Check to see if the errno was set to the expected, value of 3 : ESRCH
93 */
94 ret = kill(FAKE_PID, SIGKILL);
95 if (ret == -1 && errno == ESRCH) {
96 printf("Container: killing non-existent pid failed as expected "
97 "with ESRCH\n");
98 } else {
99 printf("Container: killing non-existent pid, didn't fail as "
100 "expected with ESRCH (%d) and a return value of -1. Got "
101 "%d (\"%s\") and a return value of %d instead.\n",
102 ESRCH, errno, strerror(errno), ret);
103 exit(1);
104 }
105
106 exit(0);
107 }
108
setup(void)109 static void setup(void)
110 {
111 tst_require_root();
112 check_newpid();
113 }
114
main()115 int main()
116 {
117 int status;
118
119 setup();
120
121 pid_t pid = getpid();
122
123 tst_resm(TINFO, "Parent: Passing the pid of the process %d", pid);
124 TEST(do_clone_unshare_test(T_CLONE, CLONE_NEWPID, kill_pid_in_childfun,
125 (void *)&pid));
126 if (TEST_RETURN == -1) {
127 tst_brkm(TFAIL | TERRNO, NULL, "clone failed");
128 } else if (wait(&status) == -1) {
129 tst_brkm(TFAIL | TERRNO, NULL, "wait failed");
130 }
131
132 tst_exit();
133 }
134