1  /* Copyright (C) 2004-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <mqueue.h>
      20  #include <stdio.h>
      21  #include <stdlib.h>
      22  #include <string.h>
      23  #include <unistd.h>
      24  #include <support/check.h>
      25  #include "tst-mqueue.h"
      26  
      27  #define TEST_FUNCTION do_test ()
      28  static int
      29  do_test (void)
      30  {
      31    if (geteuid () != 0)
      32      {
      33        puts ("this test requires root");
      34        return 0;
      35      }
      36  
      37    char name[sizeof "/tst-mqueue9-" + sizeof (pid_t) * 3];
      38    snprintf (name, sizeof (name), "/tst-mqueue9-%u", getpid ());
      39  
      40    struct mq_attr attr = { .mq_maxmsg = 1, .mq_msgsize = 1 };
      41    mqd_t q = mq_open (name, O_CREAT | O_EXCL | O_RDWR, 0600, &attr);
      42  
      43    if (q == (mqd_t) -1)
      44      {
      45        if (errno == ENOSYS)
      46  	FAIL_UNSUPPORTED ("mq_open not supported");
      47  
      48        printf ("mq_open failed with: %m\n");
      49        return 1;
      50      }
      51  
      52    add_temp_mq (name);
      53  
      54    if (seteuid (1) != 0)
      55      {
      56        printf ("failed to seteuid (1): %m\n");
      57        mq_unlink (name);
      58        return 0;
      59      }
      60  
      61    int result = 0;
      62    if (mq_unlink (name) == 0)
      63      {
      64        puts ("mq_unlink unexpectedly succeeded");
      65        result = 1;
      66      }
      67    else if (errno != EACCES)
      68      {
      69        printf ("mq_unlink did not fail with EACCES: %m\n");
      70        result = 1;;
      71      }
      72  
      73    if (seteuid (0) != 0)
      74      {
      75        printf ("failed to seteuid (0): %m\n");
      76        result = 1;
      77      }
      78  
      79    if (mq_unlink (name) != 0)
      80      {
      81        printf ("mq_unlink failed with: %m\n");
      82        result = 1;
      83      }
      84  
      85    if (mq_close (q) != 0)
      86      {
      87        printf ("mq_close failed with: %m\n");
      88        result = 1;
      89      }
      90  
      91    return result;
      92  }
      93  
      94  #include "../test-skeleton.c"