These tests validate that rseq is registered from various execution
contexts (main thread, constructor, destructor, other threads, other
threads created from constructor and destructor, forked process
(without exec), pthread_atfork handlers, pthread setspecific
destructors, C++ thread and process destructors, and signal handlers).
See the Linux kernel selftests for extensive rseq stress-tests.
Signed-off-by: Mathieu Desnoyers <***@efficios.com>
CC: Carlos O'Donell <***@redhat.com>
CC: Florian Weimer <***@redhat.com>
CC: Joseph Myers <***@codesourcery.com>
CC: Szabolcs Nagy <***@arm.com>
CC: Thomas Gleixner <***@linutronix.de>
CC: Ben Maurer <***@fb.com>
CC: Peter Zijlstra <***@infradead.org>
CC: "Paul E. McKenney" <***@linux.vnet.ibm.com>
CC: Boqun Feng <***@gmail.com>
CC: Will Deacon <***@arm.com>
CC: Dave Watson <***@fb.com>
CC: Paul Turner <***@google.com>
CC: libc-***@sourceware.org
---
nptl/Makefile | 2 +-
nptl/tst-rseq.c | 346 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 347 insertions(+), 1 deletion(-)
create mode 100644 nptl/tst-rseq.c
diff --git a/nptl/Makefile b/nptl/Makefile
index 3a5dc80c65..797309f7a8 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -323,7 +323,7 @@ tests = tst-attr1 tst-attr2 tst-attr3 tst-default-attr \
tests-internal := tst-rwlock19 tst-rwlock20 \
tst-sem11 tst-sem12 tst-sem13 \
tst-barrier5 tst-signal7 tst-mutex8 tst-mutex8-static \
- tst-mutexpi8 tst-mutexpi8-static
+ tst-mutexpi8 tst-mutexpi8-static tst-rseq
xtests = tst-setuid1 tst-setuid1-static tst-setuid2 \
tst-mutexpp1 tst-mutexpp6 tst-mutexpp10
diff --git a/nptl/tst-rseq.c b/nptl/tst-rseq.c
new file mode 100644
index 0000000000..c55345e44d
--- /dev/null
+++ b/nptl/tst-rseq.c
@@ -0,0 +1,346 @@
+/* Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Mathieu Desnoyers <***@efficios.com>, 2018.
+
+ 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
+ <http://www.gnu.org/licenses/>. */
+
+/* These tests validate that rseq is registered from various execution
+ contexts (main thread, constructor, destructor, other threads, other
+ threads created from constructor and destructor, forked process
+ (without exec), pthread_atfork handlers, pthread setspecific
+ destructors, C++ thread and process destructors, and signal handlers).
+
+ See the Linux kernel selftests for extensive rseq stress-tests. */
+
+#include <sys/syscall.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <support/check.h>
+
+#if defined (__linux__) && defined (__NR_rseq)
+#define HAS_RSEQ
+#endif
+
+#ifdef HAS_RSEQ
+#include <linux/rseq.h>
+#include <pthread.h>
+#include <syscall.h>
+#include <stdlib.h>
+#include <error.h>
+#include <errno.h>
+#include <string.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <atomic.h>
+
+static pthread_key_t rseq_test_key;
+
+extern __thread volatile struct rseq __rseq_abi
+__attribute__ ((tls_model ("initial-exec")));
+
+static int
+rseq_thread_registered (void)
+{
+ return __rseq_abi.cpu_id >= 0;
+}
+
+static int
+do_rseq_main_test (void)
+{
+ if (raise (SIGUSR1))
+ FAIL_EXIT1 ("error raising signal");
+ return rseq_thread_registered () ? 0 : 1;
+}
+
+static void
+cancel_routine (void *arg)
+{
+ if (!rseq_thread_registered ())
+ FAIL_EXIT1 ("rseq not registered in cancel routine");
+}
+
+static int cancel_thread_ready;
+
+static void
+test_cancel_thread (void)
+{
+ pthread_cleanup_push (cancel_routine, NULL);
+ atomic_store_release (&cancel_thread_ready, 1);
+ for (;;)
+ usleep (100);
+ pthread_cleanup_pop (0);
+}
+
+static void *
+thread_function (void * arg)
+{
+ int i = (int) (intptr_t) arg;
+
+ if (raise (SIGUSR1))
+ FAIL_EXIT1 ("error raising signal");
+ if (i == 0)
+ test_cancel_thread ();
+ if (pthread_setspecific (rseq_test_key, (void *) 1l))
+ FAIL_EXIT1 ("error in pthread_setspecific");
+ return rseq_thread_registered () ? NULL : (void *) 1l;
+}
+
+static void
+sighandler (int sig)
+{
+ if (!rseq_thread_registered ())
+ FAIL_EXIT1 ("rseq not registered in signal handler");
+}
+
+static int
+setup_signals (void)
+{
+ struct sigaction sa;
+
+ sigemptyset (&sa.sa_mask);
+ sigaddset (&sa.sa_mask, SIGUSR1);
+ sa.sa_flags = 0;
+ sa.sa_handler = sighandler;
+ if (sigaction (SIGUSR1, &sa, NULL) != 0)
+ {
+ FAIL_RET ("sigaction failure: %s", strerror (errno));
+ }
+ return 0;
+}
+
+#define N 7
+static const int t[N] = { 1, 2, 6, 5, 4, 3, 50 };
+
+static int
+do_rseq_threads_test (int nr_threads)
+{
+ pthread_t th[nr_threads];
+ int i;
+ int result = 0;
+ pthread_attr_t at;
+
+ if (pthread_attr_init (&at) != 0)
+ {
+ FAIL_RET ("attr_init failed");
+ }
+
+ if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
+ {
+ FAIL_RET ("attr_setstacksize failed");
+ }
+
+ cancel_thread_ready = 0;
+ for (i = 0; i < nr_threads; ++i)
+ if (pthread_create (&th[i], NULL, thread_function,
+ (void *) (intptr_t) i) != 0)
+ {
+ FAIL_EXIT1 ("creation of thread %d failed", i);
+ }
+
+ if (pthread_attr_destroy (&at) != 0)
+ {
+ FAIL_RET ("attr_destroy failed");
+ }
+
+ while (!atomic_load_acquire (&cancel_thread_ready))
+ usleep (100);
+
+ if (pthread_cancel (th[0]))
+ FAIL_EXIT1 ("error in pthread_cancel");
+
+ for (i = 0; i < nr_threads; ++i)
+ {
+ void *v;
+ if (pthread_join (th[i], &v) != 0)
+ {
+ printf ("join of thread %d failed\n", i);
+ result = 1;
+ }
+ else if (i != 0 && v != NULL)
+ {
+ printf ("join %d successful, but child failed\n", i);
+ result = 1;
+ }
+ else if (i == 0 && v == NULL)
+ {
+ printf ("join %d successful, child did not fail as expected\n", i);
+ result = 1;
+ }
+ }
+ return result;
+}
+
+static int
+sys_rseq (volatile struct rseq *rseq_abi, uint32_t rseq_len,
+ int flags, uint32_t sig)
+{
+ return syscall (__NR_rseq, rseq_abi, rseq_len, flags, sig);
+}
+
+static int
+rseq_available (void)
+{
+ int rc;
+
+ rc = sys_rseq (NULL, 0, 0, 0);
+ if (rc != -1)
+ FAIL_EXIT1 ("Unexpected rseq return value %d", rc);
+ switch (errno)
+ {
+ case ENOSYS:
+ return 0;
+ case EINVAL:
+ return 1;
+ default:
+ FAIL_EXIT1 ("Unexpected rseq error %s", strerror (errno));
+ }
+}
+
+static int
+do_rseq_fork_test (void)
+{
+ int status;
+ pid_t pid, retpid;
+
+ pid = fork ();
+ switch (pid)
+ {
+ case 0:
+ if (do_rseq_main_test ())
+ FAIL_EXIT1 ("rseq not registered in child");
+ exit (0);
+ case -1:
+ FAIL_EXIT1 ("Unexpected fork error %s", strerror (errno));
+ }
+ retpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
+ if (retpid != pid)
+ {
+ FAIL_EXIT1 ("waitpid returned %ld, expected %ld",
+ (long int) retpid, (long int) pid);
+ }
+ return WEXITSTATUS (status);
+}
+
+static int
+do_rseq_test (void)
+{
+ int i, result = 0;
+
+ if (!rseq_available ())
+ {
+ FAIL_UNSUPPORTED ("kernel does not support rseq, skipping test");
+ }
+ if (setup_signals ())
+ FAIL_EXIT1 ("error setting up signal handler");
+ if (raise (SIGUSR1))
+ FAIL_EXIT1 ("error raising signal");
+ if (do_rseq_main_test ())
+ result = 1;
+ for (i = 0; i < N; i++)
+ {
+ if (do_rseq_threads_test (t[i]))
+ result = 1;
+ }
+ if (do_rseq_fork_test ())
+ result = 1;
+ return result;
+}
+
+static void
+atfork_prepare (void)
+{
+ if (!rseq_thread_registered ())
+ FAIL_EXIT1 ("rseq not registered in pthread atfork prepare");
+}
+
+static void
+atfork_parent (void)
+{
+ if (!rseq_thread_registered ())
+ FAIL_EXIT1 ("rseq not registered in pthread atfork parent");
+}
+
+static void
+atfork_child (void)
+{
+ if (!rseq_thread_registered ())
+ FAIL_EXIT1 ("rseq not registered in pthread atfork child");
+}
+
+static void
+rseq_key_destructor (void *arg)
+{
+ if (!rseq_thread_registered ())
+ FAIL_EXIT1 ("rseq not registered in pthread key destructor");
+}
+
+static void
+do_rseq_create_key (void)
+{
+ if (pthread_key_create (&rseq_test_key, rseq_key_destructor))
+ FAIL_EXIT1 ("error in pthread_key_create");
+}
+
+static void
+do_rseq_delete_key (void)
+{
+ if (pthread_key_delete (rseq_test_key))
+ FAIL_EXIT1 ("error in pthread_key_delete");
+}
+
+static void __attribute__ ((constructor))
+do_rseq_constructor_test (void)
+{
+ support_record_failure_init ();
+ do_rseq_create_key ();
+ if (pthread_atfork (atfork_prepare, atfork_parent, atfork_child))
+ FAIL_EXIT1 ("error calling pthread_atfork");
+ if (do_rseq_test ())
+ FAIL_EXIT1 ("rseq not registered within constructor");
+}
+
+static void __attribute__ ((destructor))
+do_rseq_destructor_test (void)
+{
+ if (do_rseq_test ())
+ FAIL_EXIT1 ("rseq not registered within destructor");
+ do_rseq_delete_key ();
+}
+
+/* Test C++ destructor called at thread and process exit. */
+void
+__call_tls_dtors (void)
+{
+ if (!rseq_thread_registered ())
+ FAIL_EXIT1 ("rseq not registered in C++ thread/process exit destructor");
+}
+#else
+static int
+do_rseq_test (void)
+{
+ FAIL_UNSUPPORTED ("kernel headers do not support rseq, skipping test");
+ return 0;
+}
+#endif
+
+static int
+do_test (void)
+{
+ return do_rseq_test ();
+}
+
+#include <support/test-driver.c>
--
2.17.1