1 /*
2 * Copyright (c) Huawei Technologies Co., Ltd., 2015
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 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
11 * the GNU General Public License for more details.
12 */
13
14 /*
15 * Verify that:
16 * The kernel imposes a limit of 32 nested levels of pid namespaces.
17 */
18
19 #define _GNU_SOURCE
20 #include <sys/wait.h>
21 #include <assert.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <unistd.h>
25 #include <string.h>
26 #include <errno.h>
27 #include "pidns_helper.h"
28 #include "test.h"
29
30 #define MAXNEST 32
31
32 char *TCID = "pidns32";
33 int TST_TOTAL = 1;
34
setup(void)35 static void setup(void)
36 {
37 tst_require_root();
38 check_newpid();
39 tst_tmpdir();
40 }
41
cleanup(void)42 static void cleanup(void)
43 {
44 tst_rmdir();
45 }
46
child_fn1(void * arg)47 static int child_fn1(void *arg)
48 {
49 pid_t cpid1;
50 long level = (long)arg;
51 int status;
52
53 if (level == MAXNEST)
54 return 0;
55 cpid1 = ltp_clone_quick(CLONE_NEWPID | SIGCHLD,
56 (void *)child_fn1, (void *)(level + 1));
57 if (cpid1 < 0) {
58 printf("level %ld:unexpected error: (%d) %s\n",
59 level, errno, strerror(errno));
60 return 1;
61 }
62 if (waitpid(cpid1, &status, 0) == -1)
63 return 1;
64
65 if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
66 printf("child exited abnormally\n");
67 return 1;
68 } else if (WIFSIGNALED(status)) {
69 printf("child was killed with signal = %d", WTERMSIG(status));
70 return 1;
71 }
72 return 0;
73 }
74
test_max_nest(void)75 static void test_max_nest(void)
76 {
77 pid_t cpid1;
78
79 cpid1 = ltp_clone_quick(CLONE_NEWPID | SIGCHLD,
80 (void *)child_fn1, (void *)1);
81 if (cpid1 < 0)
82 tst_brkm(TBROK | TERRNO, cleanup, "clone failed");
83
84 tst_record_childstatus(cleanup, cpid1);
85 }
86
main(int argc,char * argv[])87 int main(int argc, char *argv[])
88 {
89 int lc;
90
91 setup();
92 tst_parse_opts(argc, argv, NULL, NULL);
93
94 for (lc = 0; TEST_LOOPING(lc); lc++) {
95 tst_count = 0;
96 test_max_nest();
97 }
98
99 cleanup();
100 tst_exit();
101 }
102