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/* Restartable Sequences NPTL test.
Copyright (C) 2021-2025 Free Software Foundation, Inc.
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/>. */
/* These tests validate that rseq is registered from various execution
contexts (main thread, destructor, other threads, other threads created
from destructor, forked process (without exec), pthread_atfork handlers,
pthread setspecific destructors, signal handlers, atexit handlers).
See the Linux kernel selftests for extensive rseq stress-tests. */
#include <stdio.h>
#include <support/check.h>
#include <support/xthread.h>
#include <sys/rseq.h>
#include <unistd.h>
/* Set this in 'do_test' only so as to invoke the destructor test in
the test process only and not 'support_test_main' parent. Otherwise
the test harness may hang in the destructor if something goes wrong. */
static int run_destructor_test;
#ifdef RSEQ_SIG
# include <array_length.h>
# include <errno.h>
# include <error.h>
# include <pthread.h>
# include <signal.h>
# include <stdlib.h>
# include <string.h>
# include <support/namespace.h>
# include <support/xsignal.h>
# include <syscall.h>
# include <sys/types.h>
# include <sys/wait.h>
# include "tst-rseq.h"
static pthread_key_t rseq_test_key;
static void
atfork_prepare (void)
{
if (!rseq_thread_registered ())
{
printf ("error: rseq not registered in pthread atfork prepare\n");
support_record_failure ();
}
}
static void
atfork_parent (void)
{
if (!rseq_thread_registered ())
{
printf ("error: rseq not registered in pthread atfork parent\n");
support_record_failure ();
}
}
static void
atfork_child (void)
{
if (!rseq_thread_registered ())
{
printf ("error: rseq not registered in pthread atfork child\n");
support_record_failure ();
}
}
static void
rseq_key_destructor (void *arg)
{
/* Cannot use deferred failure reporting after main returns. */
if (!rseq_thread_registered ())
FAIL_EXIT1 ("rseq not registered in pthread key destructor");
}
static void
atexit_handler (void)
{
/* Cannot use deferred failure reporting after main returns. */
if (!rseq_thread_registered ())
FAIL_EXIT1 ("rseq not registered in atexit handler");
}
/* Used to avoid -Werror=stringop-overread warning with
pthread_setspecific and GCC 11. */
static char one = 1;
static void
do_rseq_main_test (void)
{
TEST_COMPARE (atexit (atexit_handler), 0);
rseq_test_key = xpthread_key_create (rseq_key_destructor);
TEST_COMPARE (pthread_atfork (atfork_prepare, atfork_parent, atfork_child), 0);
xraise (SIGUSR1);
TEST_COMPARE (pthread_setspecific (rseq_test_key, &one), 0);
TEST_VERIFY_EXIT (rseq_thread_registered ());
}
static void
cancel_routine (void *arg)
{
if (!rseq_thread_registered ())
{
printf ("error: rseq not registered in cancel routine\n");
support_record_failure ();
}
}
static pthread_barrier_t cancel_thread_barrier;
static pthread_cond_t cancel_thread_cond = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t cancel_thread_mutex = PTHREAD_MUTEX_INITIALIZER;
static void
test_cancel_thread (void)
{
pthread_cleanup_push (cancel_routine, NULL);
(void) xpthread_barrier_wait (&cancel_thread_barrier);
/* Wait forever until cancellation. */
xpthread_cond_wait (&cancel_thread_cond, &cancel_thread_mutex);
pthread_cleanup_pop (0);
}
static void *
thread_function (void * arg)
{
int i = (int) (intptr_t) arg;
xraise (SIGUSR1);
if (i == 0)
test_cancel_thread ();
TEST_COMPARE (pthread_setspecific (rseq_test_key, &one), 0);
return rseq_thread_registered () ? NULL : (void *) 1l;
}
static void
sighandler (int sig)
{
if (!rseq_thread_registered ())
{
printf ("error: rseq not registered in signal handler\n");
support_record_failure ();
}
}
static void
setup_signals (void)
{
struct sigaction sa;
sigemptyset (&sa.sa_mask);
sigaddset (&sa.sa_mask, SIGUSR1);
sa.sa_flags = 0;
sa.sa_handler = sighandler;
xsigaction (SIGUSR1, &sa, NULL);
}
static int
do_rseq_threads_test (int nr_threads)
{
pthread_t th[nr_threads];
int i;
int result = 0;
xpthread_barrier_init (&cancel_thread_barrier, NULL, 2);
for (i = 0; i < nr_threads; ++i)
th[i] = xpthread_create (NULL, thread_function,
(void *) (intptr_t) i);
(void) xpthread_barrier_wait (&cancel_thread_barrier);
xpthread_cancel (th[0]);
for (i = 0; i < nr_threads; ++i)
{
void *v;
v = xpthread_join (th[i]);
if (i != 0 && v != NULL)
{
printf ("error: join %d successful, but child failed\n", i);
result = 1;
}
else if (i == 0 && v == NULL)
{
printf ("error: join %d successful, child did not fail as expected\n", i);
result = 1;
}
}
xpthread_barrier_destroy (&cancel_thread_barrier);
return result;
}
static void
subprocess_callback (void *closure)
{
do_rseq_main_test ();
}
static void
do_rseq_fork_test (void)
{
support_isolate_in_subprocess (subprocess_callback, NULL);
}
static int
do_rseq_test (void)
{
int t[] = { 1, 2, 6, 5, 4, 3, 50 };
int i, result = 0;
if (!rseq_available ())
FAIL_UNSUPPORTED ("kernel does not support rseq, skipping test");
setup_signals ();
xraise (SIGUSR1);
do_rseq_main_test ();
for (i = 0; i < array_length (t); i++)
if (do_rseq_threads_test (t[i]))
result = 1;
do_rseq_fork_test ();
return result;
}
static void __attribute__ ((destructor))
do_rseq_destructor_test (void)
{
if (!run_destructor_test)
return;
/* Cannot use deferred failure reporting after main returns. */
if (do_rseq_test ())
FAIL_EXIT1 ("rseq not registered within destructor");
xpthread_key_delete (rseq_test_key);
}
#else /* RSEQ_SIG */
static int
do_rseq_test (void)
{
FAIL_UNSUPPORTED ("glibc does not define RSEQ_SIG, skipping test");
return 0;
}
#endif /* RSEQ_SIG */
static int
do_test (void)
{
run_destructor_test = 1;
return do_rseq_test ();
}
#include <support/test-driver.c>
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