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librt: add test (bug 28213)

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This test implements following logic:
1) Create POSIX message queue.
   Register a notification with mq_notify (using NULL attributes).
   Then immediately unregister the notification with mq_notify.
   Helper thread in a vulnerable version of glibc
   should cause NULL pointer dereference after these steps.
2) Once again, register the same notification.
   Try to send a dummy message.
   Test is considered successfulif the dummy message
   is successfully received by the callback function.

Signed-off-by: Nikita Popov <npv1310@gmail.com>
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Nikita Popov 2021-08-12 16:09:50 +05:30 committed by Siddhesh Poyarekar
parent dc906e94f7
commit 4cc79c2177
2 changed files with 102 additions and 0 deletions
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1
rt/Makefile
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@ -74,6 +74,7 @@ tests := tst-shm tst-timer tst-timer2 \
tst-aio7 tst-aio8 tst-aio9 tst-aio10 \
tst-mqueue1 tst-mqueue2 tst-mqueue3 tst-mqueue4 \
tst-mqueue5 tst-mqueue6 tst-mqueue7 tst-mqueue8 tst-mqueue9 \
tst-bz28213 \
tst-timer3 tst-timer4 tst-timer5 \
tst-cpuclock2 tst-cputimer1 tst-cputimer2 tst-cputimer3 \
tst-shm-cancel \

101
rt/tst-bz28213.c Normal file
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@ -0,0 +1,101 @@
/* Bug 28213: test for NULL pointer dereference in mq_notify.
Copyright (C) The GNU Toolchain Authors.
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 <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <mqueue.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
static mqd_t m = -1;
static const char msg[] = "hello";
static void
check_bz28213_cb (union sigval sv)
{
char buf[sizeof (msg)];
(void) sv;
TEST_VERIFY_EXIT ((size_t) mq_receive (m, buf, sizeof (buf), NULL)
== sizeof (buf));
TEST_VERIFY_EXIT (memcmp (buf, msg, sizeof (buf)) == 0);
exit (0);
}
static void
check_bz28213 (void)
{
struct sigevent sev;
memset (&sev, '\0', sizeof (sev));
sev.sigev_notify = SIGEV_THREAD;
sev.sigev_notify_function = check_bz28213_cb;
/* Step 1: Register & unregister notifier.
Helper thread should receive NOTIFY_REMOVED notification.
In a vulnerable version of glibc, NULL pointer dereference follows. */
TEST_VERIFY_EXIT (mq_notify (m, &sev) == 0);
TEST_VERIFY_EXIT (mq_notify (m, NULL) == 0);
/* Step 2: Once again, register notification.
Try to send one message.
Test is considered successful, if the callback does exit (0). */
TEST_VERIFY_EXIT (mq_notify (m, &sev) == 0);
TEST_VERIFY_EXIT (mq_send (m, msg, sizeof (msg), 1) == 0);
/* Wait... */
pause ();
}
static int
do_test (void)
{
static const char m_name[] = "/bz28213_queue";
struct mq_attr m_attr;
memset (&m_attr, '\0', sizeof (m_attr));
m_attr.mq_maxmsg = 1;
m_attr.mq_msgsize = sizeof (msg);
m = mq_open (m_name,
O_RDWR | O_CREAT | O_EXCL,
0600,
&m_attr);
if (m < 0)
{
if (errno == ENOSYS)
FAIL_UNSUPPORTED ("POSIX message queues are not implemented\n");
FAIL_EXIT1 ("Failed to create POSIX message queue: %m\n");
}
TEST_VERIFY_EXIT (mq_unlink (m_name) == 0);
check_bz28213 ();
return 0;
}
#include <support/test-driver.c>