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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) Veerendra C <vechandr@in.ibm.com>, 2008
* Copyright (C) 2023 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
*/
/*\
* [Description]
*
* Clone a process with CLONE_NEWPID flag and create many levels of child
* containers. Then kill container init process from parent and check if all
* containers have been killed.
*/
#include <sys/wait.h>
#include "tst_test.h"
#include "lapi/sched.h"
#define MAX_DEPTH 5
static struct tst_clone_args clone_args = {
.flags = CLONE_NEWPID,
.exit_signal = SIGCHLD
};
static pid_t pid_max;
static void child_func(const int level)
{
pid_t cpid, ppid;
cpid = tst_getpid();
ppid = getppid();
TST_EXP_EQ_LI(cpid, 1);
TST_EXP_EQ_LI(ppid, 0);
if (level >= MAX_DEPTH - 1) {
TST_CHECKPOINT_WAKE(0);
return;
}
if (!SAFE_CLONE(&clone_args)) {
child_func(level + 1);
return;
}
pause();
}
static int find_cinit_pids(pid_t *pids)
{
int pid;
int next = 0;
pid_t parentpid, pgid, pgid2;
parentpid = tst_getpid();
pgid = SAFE_GETPGID(parentpid);
for (pid = 2; pid < pid_max; pid++) {
if (pid == parentpid)
continue;
pgid2 = getpgid(pid);
if (pgid2 == pgid) {
pids[next] = pid;
next++;
}
}
return next;
}
static void setup(void)
{
SAFE_FILE_SCANF("/proc/sys/kernel/pid_max", "%d\n", &pid_max);
}
static void run(void)
{
int i, status, children;
pid_t pids_new[MAX_DEPTH];
pid_t pids[MAX_DEPTH];
pid_t pid;
pid = SAFE_CLONE(&clone_args);
if (!pid) {
child_func(0);
return;
}
TST_CHECKPOINT_WAIT(0);
TST_EXP_POSITIVE(find_cinit_pids(pids));
SAFE_KILL(pid, SIGKILL);
SAFE_WAITPID(0, &status, 0);
children = find_cinit_pids(pids_new);
if (children > 0) {
tst_res(TFAIL, "%d children left after sending SIGKILL", children);
for (i = 0; i < MAX_DEPTH; i++) {
kill(pids[i], SIGKILL);
waitpid(pids[i], &status, 0);
}
return;
}
tst_res(TPASS, "No children left after sending SIGKILL to the first child");
}
static struct tst_test test = {
.test_all = run,
.setup = setup,
.needs_root = 1,
.needs_checkpoints = 1,
.forks_child = 1,
};
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