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
32char *TCID = "pidns32";
33int TST_TOTAL = 1;
34
35static void setup(void)
36{
37	tst_require_root();
38	check_newpid();
39	tst_tmpdir();
40}
41
42static void cleanup(void)
43{
44	tst_rmdir();
45}
46
47static 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
75static 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
87int 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