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/* Test if CLONE_VM does not change pthread pid/tid field (BZ #19957)
Copyright (C) 2021-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sched.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/syscall.h>
#include <clone_internal.h>
#include <support/xunistd.h>
#include <support/check.h>
static int sig;
static int pipefd[2];
static int
f (void *a)
{
close (pipefd[0]);
pid_t ppid = getppid ();
pid_t pid = getpid ();
pid_t tid = gettid ();
if (write (pipefd[1], &ppid, sizeof ppid) != sizeof (ppid))
FAIL_EXIT1 ("write ppid failed\n");
if (write (pipefd[1], &pid, sizeof pid) != sizeof (pid))
FAIL_EXIT1 ("write pid failed\n");
if (write (pipefd[1], &tid, sizeof tid) != sizeof (tid))
FAIL_EXIT1 ("write tid failed\n");
return 0;
}
static int
do_test (void)
{
sig = SIGRTMIN;
sigset_t ss;
sigemptyset (&ss);
sigaddset (&ss, sig);
if (sigprocmask (SIG_BLOCK, &ss, NULL) != 0)
FAIL_EXIT1 ("sigprocmask failed: %m");
if (pipe2 (pipefd, O_CLOEXEC))
FAIL_EXIT1 ("pipe failed: %m");
#define STACK_SIZE 128 * 1024
char st[STACK_SIZE] __attribute__ ((aligned));
struct clone_args clone_args =
{
.stack = (uintptr_t) st,
.stack_size = sizeof (st),
};
pid_t p = __clone_internal (&clone_args, f, 0);
close (pipefd[1]);
if (p == -1)
FAIL_EXIT1("clone failed: %m");
pid_t ppid, pid, tid;
if (read (pipefd[0], &ppid, sizeof pid) != sizeof pid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read ppid failed: %m");
}
if (read (pipefd[0], &pid, sizeof pid) != sizeof pid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read pid failed: %m");
}
if (read (pipefd[0], &tid, sizeof tid) != sizeof tid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read tid failed: %m");
}
close (pipefd[0]);
pid_t own_pid = getpid ();
pid_t own_tid = syscall (__NR_gettid);
/* Some sanity checks for clone syscall: returned ppid should be current
pid and both returned tid/pid should be different from current one. */
if ((ppid != own_pid) || (pid == own_pid) || (tid == own_tid))
FAIL_RET ("ppid=%i pid=%i tid=%i | own_pid=%i own_tid=%i",
(int)ppid, (int)pid, (int)tid, (int)own_pid, (int)own_tid);
int e;
xwaitpid (p, &e, __WCLONE);
TEST_VERIFY (WIFEXITED (e));
TEST_COMPARE (WEXITSTATUS (e), 0);
return 0;
}
#include <support/test-driver.c>
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