mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
264 lines
7.0 KiB
C
264 lines
7.0 KiB
C
/* Test for required cancellation points in fortified functions (BZ #29274)
|
|
Copyright (C) 2022-2024 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 <array_length.h>
|
|
#include <errno.h>
|
|
#include <poll.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <support/check.h>
|
|
#include <support/xthread.h>
|
|
#include <support/xunistd.h>
|
|
#include <sys/socket.h>
|
|
|
|
/* Cleanup handling test. */
|
|
static int cl_called;
|
|
|
|
static void
|
|
cl (void *arg)
|
|
{
|
|
++cl_called;
|
|
}
|
|
|
|
static int fds[2];
|
|
static pthread_barrier_t barrier;
|
|
|
|
static void *
|
|
tf_read (void *n)
|
|
{
|
|
pthread_cleanup_push (cl, NULL);
|
|
|
|
xpthread_barrier_wait (&barrier);
|
|
|
|
/* This call should be forwarded to __read_chk because the buffer size
|
|
is known, but the read length is non-constant. */
|
|
char c;
|
|
if (read (fds[0], &c, (uintptr_t) n) != 1)
|
|
return (void *) -1L;
|
|
|
|
pthread_cleanup_pop (0);
|
|
return 0;
|
|
}
|
|
|
|
static void *
|
|
tf_pread (void *n)
|
|
{
|
|
pthread_cleanup_push (cl, NULL);
|
|
|
|
xpthread_barrier_wait (&barrier);
|
|
|
|
/* This call should be forwarded to __pread_chk because the buffer size
|
|
is known, but the read length is non-constant. */
|
|
char c;
|
|
if (pread (fds[0], &c, (uintptr_t) n, 0) != 1)
|
|
return (void *) -1L;
|
|
|
|
pthread_cleanup_pop (0);
|
|
return 0;
|
|
}
|
|
|
|
static void *
|
|
tf_pread64 (void *n)
|
|
{
|
|
pthread_cleanup_push (cl, NULL);
|
|
|
|
xpthread_barrier_wait (&barrier);
|
|
|
|
/* This call should be forwarded to __pread64_chk because the buffer size
|
|
is known, but the read length is non-constant. */
|
|
char c;
|
|
if (pread64 (fds[0], &c, (uintptr_t) n, 0) != 1)
|
|
return (void *) -1L;
|
|
|
|
pthread_cleanup_pop (0);
|
|
return 0;
|
|
}
|
|
|
|
static void *
|
|
tf_poll (void *n)
|
|
{
|
|
pthread_cleanup_push (cl, NULL);
|
|
|
|
xpthread_barrier_wait (&barrier);
|
|
|
|
/* This call should be forwarded to __poll_chk because the pollfd size
|
|
is known, but the number of entries is non-constant. */
|
|
struct pollfd pfd = { fds[0], POLLIN, 0 };
|
|
if (poll (&pfd, (uintptr_t) n, -1) != 1)
|
|
return (void *) -1L;
|
|
|
|
pthread_cleanup_pop (0);
|
|
return 0;
|
|
}
|
|
|
|
static void *
|
|
tf_ppoll (void *n)
|
|
{
|
|
pthread_cleanup_push (cl, NULL);
|
|
|
|
xpthread_barrier_wait (&barrier);
|
|
|
|
/* This call should be forwarded to __ppoll_chk because the pollfd size
|
|
is known, but the number of entries is non-constant. */
|
|
struct pollfd pfd = { fds[0], POLLIN, 0 };
|
|
if (ppoll (&pfd, (uintptr_t) n, 0, 0) != 1)
|
|
return (void *) -1L;
|
|
|
|
pthread_cleanup_pop (0);
|
|
return 0;
|
|
}
|
|
|
|
static void *
|
|
tf_recv (void *n)
|
|
{
|
|
pthread_cleanup_push (cl, NULL);
|
|
|
|
xpthread_barrier_wait (&barrier);
|
|
|
|
/* This call should be forwarded to __ppoll_chk because the pollfd size
|
|
is known, but the number of entries is non-constant. */
|
|
char c;
|
|
if (recv (fds[0], &c, (uintptr_t) n, 0) != 1)
|
|
return (void *) -1L;
|
|
|
|
pthread_cleanup_pop (0);
|
|
return 0;
|
|
}
|
|
|
|
static void *
|
|
tf_recvfrom (void *n)
|
|
{
|
|
pthread_cleanup_push (cl, NULL);
|
|
|
|
xpthread_barrier_wait (&barrier);
|
|
|
|
/* This call should be forwarded to __ppoll_chk because the pollfd size
|
|
is known, but the number of entries is non-constant. */
|
|
char c;
|
|
if (recvfrom (fds[0], &c, (uintptr_t) n, 0, NULL, NULL) != 1)
|
|
return (void *) -1L;
|
|
|
|
pthread_cleanup_pop (0);
|
|
return 0;
|
|
}
|
|
|
|
static struct cancel_tests
|
|
{
|
|
const char *name;
|
|
void *(*tf) (void *);
|
|
bool only_early;
|
|
#define ADD_TEST(name, early) { #name, tf_##name, early }
|
|
} tests[] =
|
|
{
|
|
ADD_TEST (poll, false),
|
|
ADD_TEST (ppoll, false),
|
|
ADD_TEST (pread, true),
|
|
ADD_TEST (pread64, true),
|
|
ADD_TEST (read, false),
|
|
ADD_TEST (recv, false),
|
|
ADD_TEST (recvfrom, false),
|
|
};
|
|
|
|
/* Set the send buffer of socket S to 1 byte so any send operation
|
|
done with WRITE_BUFFER_SIZE bytes will force syscall blocking. */
|
|
static void
|
|
set_socket_buffer (int s)
|
|
{
|
|
int val = 1;
|
|
socklen_t len = sizeof (val);
|
|
|
|
TEST_VERIFY_EXIT (setsockopt (s, SOL_SOCKET, SO_SNDBUF, &val,
|
|
sizeof (val)) == 0);
|
|
TEST_VERIFY_EXIT (getsockopt (s, SOL_SOCKET, SO_SNDBUF, &val, &len) == 0);
|
|
printf ("%s: got size %d\n", __func__, val);
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
xpthread_barrier_init (&barrier, 0, 2);
|
|
|
|
if (socketpair (AF_UNIX, SOCK_STREAM, 0, fds) != 0)
|
|
FAIL_EXIT1 ("socketpair: %m");
|
|
set_socket_buffer (fds[1]);
|
|
|
|
/* This is the !only_early test. It is a late cancel test that has a sleep
|
|
in the main thread in an attempt to allow the child thread to reach and
|
|
block on the syscall. The cancellation should happen with high
|
|
probability when the child thread blocked on the syscall, and that is
|
|
the intent of the test (syscall cancellation registration complete). */
|
|
for (int i = 0; i < array_length (tests); i++)
|
|
{
|
|
if (tests[i].only_early)
|
|
continue;
|
|
|
|
xpthread_barrier_init (&barrier, NULL, 2);
|
|
/* Reset the counter for the cleanup handler. */
|
|
cl_called = 0;
|
|
|
|
pthread_t thr = xpthread_create (0, tests[i].tf, (void *) 1L);
|
|
/* After this wait the threads cancellation handler is installed. */
|
|
xpthread_barrier_wait (&barrier);
|
|
|
|
struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 };
|
|
TEMP_FAILURE_RETRY (clock_nanosleep (CLOCK_REALTIME, 0, &ts, &ts));
|
|
|
|
xpthread_cancel (thr);
|
|
|
|
void *status = xpthread_join (thr);
|
|
TEST_VERIFY (status == PTHREAD_CANCELED);
|
|
TEST_COMPARE (cl_called, 1);
|
|
|
|
printf ("in-time cancel test of '%s' successful\n", tests[i].name);
|
|
}
|
|
|
|
/* This is a early cancel test that happens before the syscall is issued.
|
|
In this case there is no signal involved, pthread_cancel will just mark
|
|
the target thread canceled, since asynchronous mode is not set, and the
|
|
cancellable entrypoint will check if the thread is set as cancelled and
|
|
exit early.
|
|
|
|
Keep in mind that neither pthread_barrier_wait nor pthread_cleanup_push
|
|
act as cancellation entrypoints. */
|
|
for (int i = 0; i < array_length (tests); i++)
|
|
{
|
|
xpthread_barrier_init (&barrier, NULL, 2);
|
|
/* Reset the counter for the cleanup handler. */
|
|
cl_called = 0;
|
|
|
|
/* After this wait the cancellation handler is in place. */
|
|
pthread_t thr = xpthread_create (0, tests[i].tf, NULL);
|
|
|
|
xpthread_cancel (thr);
|
|
xpthread_barrier_wait (&barrier);
|
|
|
|
void *status = xpthread_join (thr);
|
|
TEST_VERIFY (status == PTHREAD_CANCELED);
|
|
TEST_COMPARE (cl_called, 1);
|
|
|
|
printf ("early cancel test of '%s' successful\n", tests[i].name);
|
|
}
|
|
|
|
xpthread_barrier_destroy (&barrier);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|