rt/tst-bz28213.c

   1 /* Bug 28213: test for NULL pointer dereference in mq_notify.
   2    Copyright The GNU Toolchain Authors.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24 #include <mqueue.h>
  25 #include <signal.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <support/check.h>
  29
  30 static mqd_t m = -1;
  31 static const char msg[] = "hello";
  32
  33 static void
  34 check_bz28213_cb (union sigval sv)
  35 {
  36   char buf[sizeof (msg)];
  37
  38   (void) sv;
  39
  40   TEST_VERIFY_EXIT ((size_t) mq_receive (m, buf, sizeof (buf), NULL)
  41                     == sizeof (buf));
  42   TEST_VERIFY_EXIT (memcmp (buf, msg, sizeof (buf)) == 0);
  43
  44   exit (0);
  45 }
  46
  47 static void
  48 check_bz28213 (void)
  49 {
  50   struct sigevent sev;
  51
  52   memset (&sev, '\0', sizeof (sev));
  53   sev.sigev_notify = SIGEV_THREAD;
  54   sev.sigev_notify_function = check_bz28213_cb;
  55
  56   /* Step 1: Register & unregister notifier.
  57      Helper thread should receive NOTIFY_REMOVED notification.
  58      In a vulnerable version of glibc, NULL pointer dereference follows. */
  59   TEST_VERIFY_EXIT (mq_notify (m, &sev) == 0);
  60   TEST_VERIFY_EXIT (mq_notify (m, NULL) == 0);
  61
  62   /* Step 2: Once again, register notification.
  63      Try to send one message.
  64      Test is considered successful, if the callback does exit (0). */
  65   TEST_VERIFY_EXIT (mq_notify (m, &sev) == 0);
  66   TEST_VERIFY_EXIT (mq_send (m, msg, sizeof (msg), 1) == 0);
  67
  68   /* Wait... */
  69   pause ();
  70 }
  71
  72 static int
  73 do_test (void)
  74 {
  75   static const char m_name[] = "/bz28213_queue";
  76   struct mq_attr m_attr;
  77
  78   memset (&m_attr, '\0', sizeof (m_attr));
  79   m_attr.mq_maxmsg = 1;
  80   m_attr.mq_msgsize = sizeof (msg);
  81
  82   m = mq_open (m_name,
  83                O_RDWR | O_CREAT | O_EXCL,
  84                0600,
  85                &m_attr);
  86
  87   if (m < 0)
  88     {
  89       if (errno == ENOSYS)
  90         FAIL_UNSUPPORTED ("POSIX message queues are not implemented\n");
  91       FAIL_EXIT1 ("Failed to create POSIX message queue: %m\n");
  92     }
  93
  94   TEST_VERIFY_EXIT (mq_unlink (m_name) == 0);
  95
  96   check_bz28213 ();
  97
  98   return 0;
  99 }
 100
 101 #include <support/test-driver.c>