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264 lines
7.0 KiB
C
264 lines
7.0 KiB
C
/* Test for required cancellation points in fortified functions (BZ #29274)
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Copyright (C) 2022-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <array_length.h>
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#include <errno.h>
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#include <poll.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/xthread.h>
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#include <support/xunistd.h>
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#include <sys/socket.h>
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/* Cleanup handling test. */
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static int cl_called;
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static void
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cl (void *arg)
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{
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++cl_called;
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}
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static int fds[2];
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static pthread_barrier_t barrier;
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static void *
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tf_read (void *n)
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{
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pthread_cleanup_push (cl, NULL);
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xpthread_barrier_wait (&barrier);
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/* This call should be forwarded to __read_chk because the buffer size
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is known, but the read length is non-constant. */
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char c;
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if (read (fds[0], &c, (uintptr_t) n) != 1)
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return (void *) -1L;
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pthread_cleanup_pop (0);
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return 0;
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}
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static void *
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tf_pread (void *n)
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{
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pthread_cleanup_push (cl, NULL);
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xpthread_barrier_wait (&barrier);
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/* This call should be forwarded to __pread_chk because the buffer size
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is known, but the read length is non-constant. */
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char c;
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if (pread (fds[0], &c, (uintptr_t) n, 0) != 1)
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return (void *) -1L;
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pthread_cleanup_pop (0);
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return 0;
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}
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static void *
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tf_pread64 (void *n)
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{
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pthread_cleanup_push (cl, NULL);
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xpthread_barrier_wait (&barrier);
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/* This call should be forwarded to __pread64_chk because the buffer size
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is known, but the read length is non-constant. */
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char c;
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if (pread64 (fds[0], &c, (uintptr_t) n, 0) != 1)
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return (void *) -1L;
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pthread_cleanup_pop (0);
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return 0;
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}
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static void *
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tf_poll (void *n)
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{
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pthread_cleanup_push (cl, NULL);
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xpthread_barrier_wait (&barrier);
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/* This call should be forwarded to __poll_chk because the pollfd size
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is known, but the number of entries is non-constant. */
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struct pollfd pfd = { fds[0], POLLIN, 0 };
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if (poll (&pfd, (uintptr_t) n, -1) != 1)
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return (void *) -1L;
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pthread_cleanup_pop (0);
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return 0;
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}
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static void *
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tf_ppoll (void *n)
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{
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pthread_cleanup_push (cl, NULL);
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xpthread_barrier_wait (&barrier);
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/* This call should be forwarded to __ppoll_chk because the pollfd size
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is known, but the number of entries is non-constant. */
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struct pollfd pfd = { fds[0], POLLIN, 0 };
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if (ppoll (&pfd, (uintptr_t) n, 0, 0) != 1)
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return (void *) -1L;
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pthread_cleanup_pop (0);
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return 0;
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}
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static void *
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tf_recv (void *n)
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{
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pthread_cleanup_push (cl, NULL);
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xpthread_barrier_wait (&barrier);
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/* This call should be forwarded to __ppoll_chk because the pollfd size
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is known, but the number of entries is non-constant. */
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char c;
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if (recv (fds[0], &c, (uintptr_t) n, 0) != 1)
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return (void *) -1L;
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pthread_cleanup_pop (0);
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return 0;
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}
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static void *
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tf_recvfrom (void *n)
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{
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pthread_cleanup_push (cl, NULL);
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xpthread_barrier_wait (&barrier);
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/* This call should be forwarded to __ppoll_chk because the pollfd size
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is known, but the number of entries is non-constant. */
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char c;
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if (recvfrom (fds[0], &c, (uintptr_t) n, 0, NULL, NULL) != 1)
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return (void *) -1L;
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pthread_cleanup_pop (0);
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return 0;
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}
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static struct cancel_tests
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{
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const char *name;
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void *(*tf) (void *);
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bool only_early;
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#define ADD_TEST(name, early) { #name, tf_##name, early }
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} tests[] =
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{
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ADD_TEST (poll, false),
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ADD_TEST (ppoll, false),
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ADD_TEST (pread, true),
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ADD_TEST (pread64, true),
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ADD_TEST (read, false),
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ADD_TEST (recv, false),
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ADD_TEST (recvfrom, false),
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};
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/* Set the send buffer of socket S to 1 byte so any send operation
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done with WRITE_BUFFER_SIZE bytes will force syscall blocking. */
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static void
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set_socket_buffer (int s)
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{
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int val = 1;
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socklen_t len = sizeof (val);
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TEST_VERIFY_EXIT (setsockopt (s, SOL_SOCKET, SO_SNDBUF, &val,
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sizeof (val)) == 0);
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TEST_VERIFY_EXIT (getsockopt (s, SOL_SOCKET, SO_SNDBUF, &val, &len) == 0);
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printf ("%s: got size %d\n", __func__, val);
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}
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static int
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do_test (void)
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{
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xpthread_barrier_init (&barrier, 0, 2);
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if (socketpair (AF_UNIX, SOCK_STREAM, 0, fds) != 0)
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FAIL_EXIT1 ("socketpair: %m");
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set_socket_buffer (fds[1]);
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/* This is the !only_early test. It is a late cancel test that has a sleep
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in the main thread in an attempt to allow the child thread to reach and
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block on the syscall. The cancellation should happen with high
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probability when the child thread blocked on the syscall, and that is
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the intent of the test (syscall cancellation registration complete). */
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for (int i = 0; i < array_length (tests); i++)
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{
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if (tests[i].only_early)
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continue;
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xpthread_barrier_init (&barrier, NULL, 2);
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/* Reset the counter for the cleanup handler. */
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cl_called = 0;
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pthread_t thr = xpthread_create (0, tests[i].tf, (void *) 1L);
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/* After this wait the threads cancellation handler is installed. */
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xpthread_barrier_wait (&barrier);
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struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 };
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TEMP_FAILURE_RETRY (clock_nanosleep (CLOCK_REALTIME, 0, &ts, &ts));
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xpthread_cancel (thr);
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void *status = xpthread_join (thr);
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TEST_VERIFY (status == PTHREAD_CANCELED);
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TEST_COMPARE (cl_called, 1);
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printf ("in-time cancel test of '%s' successful\n", tests[i].name);
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}
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/* This is a early cancel test that happens before the syscall is issued.
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In this case there is no signal involved, pthread_cancel will just mark
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the target thread canceled, since asynchronous mode is not set, and the
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cancellable entrypoint will check if the thread is set as cancelled and
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exit early.
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Keep in mind that neither pthread_barrier_wait nor pthread_cleanup_push
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act as cancellation entrypoints. */
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for (int i = 0; i < array_length (tests); i++)
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{
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xpthread_barrier_init (&barrier, NULL, 2);
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/* Reset the counter for the cleanup handler. */
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cl_called = 0;
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/* After this wait the cancellation handler is in place. */
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pthread_t thr = xpthread_create (0, tests[i].tf, NULL);
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xpthread_cancel (thr);
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xpthread_barrier_wait (&barrier);
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void *status = xpthread_join (thr);
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TEST_VERIFY (status == PTHREAD_CANCELED);
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TEST_COMPARE (cl_called, 1);
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printf ("early cancel test of '%s' successful\n", tests[i].name);
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}
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xpthread_barrier_destroy (&barrier);
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return 0;
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}
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#include <support/test-driver.c>
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