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>