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 "test.h"
45 #include <libclone.h>
46 #include <signal.h>
47 #include "pidns_helper.h"
48
49 #define CINIT_PID 1
50 #define PARENT_PID 0
51 #define FAKE_PID -1
52
53 char *TCID = "pidns06";
54 int TST_TOTAL = 1;
55
56 /*
57 * kill_pid_in_childfun()
58 * Cont-init tries to kill the parent-process using parent's global Pid.
59 * Also checks passing SIGKILL to non existent PID in the container.
60 */
kill_pid_in_childfun(void * vtest)61 static int kill_pid_in_childfun(void *vtest)
62 {
63 int cpid, ppid, *par_pid;
64 int ret = 0;
65 cpid = getpid();
66 ppid = getppid();
67 par_pid = (int *)vtest;
68
69 /* Checking the values to make sure pidns is created correctly */
70 if (cpid != CINIT_PID || ppid != PARENT_PID) {
71 printf("Unexpected result for Container: init "
72 "pid=%d ppid=%d\n", cpid, ppid);
73 exit(1);
74 }
75
76 /*
77 * While trying kill() of the pid of the parent namespace..
78 * Check to see if the errno was set to the expected, value of 3 : ESRCH
79 */
80 ret = kill(*par_pid, SIGKILL);
81 if (ret == -1 && errno == ESRCH) {
82 printf("Container: killing parent pid=%d failed as expected "
83 "with ESRCH\n", *par_pid);
84 } else {
85 printf("Container: killing parent pid=%d, didn't fail as "
86 "expected with ESRCH (%d) and a return value of -1. Got "
87 "%d (\"%s\") and a return value of %d instead.\n",
88 *par_pid, ESRCH, errno, strerror(errno), ret);
89 exit(1);
90 }
91 /*
92 * While killing non-existent pid in the container,
93 * Check to see if the errno was set to the expected, value of 3 : ESRCH
94 */
95 ret = kill(FAKE_PID, SIGKILL);
96 if (ret == -1 && errno == ESRCH) {
97 printf("Container: killing non-existent pid failed as expected "
98 "with ESRCH\n");
99 } else {
100 printf("Container: killing non-existent pid, didn't fail as "
101 "expected with ESRCH (%d) and a return value of -1. Got "
102 "%d (\"%s\") and a return value of %d instead.\n",
103 ESRCH, errno, strerror(errno), ret);
104 exit(1);
105 }
106
107 exit(0);
108 }
109
setup(void)110 static void setup(void)
111 {
112 tst_require_root();
113 check_newpid();
114 }
115
main()116 int main()
117 {
118 int status;
119
120 setup();
121
122 pid_t pid = getpid();
123
124 tst_resm(TINFO, "Parent: Passing the pid of the process %d", pid);
125 TEST(do_clone_unshare_test(T_CLONE, CLONE_NEWPID, kill_pid_in_childfun,
126 (void *)&pid));
127 if (TEST_RETURN == -1) {
128 tst_brkm(TFAIL | TERRNO, NULL, "clone failed");
129 } else if (wait(&status) == -1) {
130 tst_brkm(TFAIL | TERRNO, NULL, "wait failed");
131 }
132
133 tst_exit();
134 }
135