1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
/*
* Test PID namespace translation
*
* Copyright (c) 2020 Ákos Uzonyi <uzonyi.akos@gmail.com>
* Copyright (c) 2020-2022 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include "pidns.h"
#ifdef __NR_fork
# include <errno.h>
# include <limits.h>
# include <sched.h>
# include <signal.h>
# include <stdio.h>
# include <stdlib.h>
# include <sys/wait.h>
# include <unistd.h>
# include <linux/sched.h>
# include <linux/nsfs.h>
static int
fork_chain(int depth)
{
if (!depth)
return 0;
int pid = syscall(__NR_fork);
if (pid < 0)
return errno;
if (!pid)
_exit(fork_chain(depth - 1));
int status;
if (waitpid(pid, &status, 0) < 0) {
if (errno == ECHILD)
_exit(fork_chain(depth - 1));
return errno;
}
if (!WIFEXITED(status))
return -1;
return WEXITSTATUS(status);
}
int main(void)
{
check_ns_ioctl();
if (unshare(CLONE_NEWPID | CLONE_NEWUSER) < 0) {
if (errno == EPERM)
perror_msg_and_skip("unshare");
perror_msg_and_fail("unshare");
}
errno = fork_chain(2);
if (errno)
perror_msg_and_fail("fork_chain");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("__NR_fork")
#endif
|
