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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) Huawei Technologies Co., Ltd., 2015
* Copyright (C) 2022 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
*/
/*\
* [Description]
*
* Clone a process with CLONE_NEWPID flag and check for the maxium amount of
* nested containers.
*/
#define _GNU_SOURCE
#include <sys/mman.h>
#include "tst_test.h"
#include "lapi/sched.h"
#define MAXNEST 32
static int *level;
static int child_func(LTP_ATTRIBUTE_UNUSED void *arg)
{
pid_t cpid;
int status;
if (*level == MAXNEST)
return 0;
(*level)++;
cpid = ltp_clone_quick(CLONE_NEWPID | SIGCHLD, child_func, 0);
if (cpid < 0)
tst_brk(TBROK | TERRNO, "clone failed");
SAFE_WAITPID(cpid, &status, 0);
return 0;
}
static void setup(void)
{
level = SAFE_MMAP(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
}
static void run(void)
{
int ret, status;
*level = 1;
ret = ltp_clone_quick(CLONE_NEWPID | SIGCHLD, child_func, 0);
if (ret < 0)
tst_brk(TBROK | TERRNO, "clone failed");
SAFE_WAITPID(ret, &status, 0);
if (*level < MAXNEST) {
tst_res(TFAIL, "Nested containers should be %d, but they are %d", MAXNEST, *level);
return;
}
tst_res(TPASS, "All %d containers have been nested", MAXNEST);
}
static struct tst_test test = {
.test_all = run,
.needs_root = 1,
.setup = setup,
};
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