rt/tst-mqueue9.c

   1 /* Copyright (C) 2004-2021 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 "tst-mqueue.h"
  25
  26 #define TEST_FUNCTION do_test ()
  27 static int
  28 do_test (void)
  29 {
  30   if (geteuid () != 0)
  31     {
  32       puts ("this test requires root");
  33       return 0;
  34     }
  35
  36   char name[sizeof "/tst-mqueue9-" + sizeof (pid_t) * 3];
  37   snprintf (name, sizeof (name), "/tst-mqueue9-%u", getpid ());
  38
  39   struct mq_attr attr = { .mq_maxmsg = 1, .mq_msgsize = 1 };
  40   mqd_t q = mq_open (name, O_CREAT | O_EXCL | O_RDWR, 0600, &attr);
  41
  42   if (q == (mqd_t) -1)
  43     {
  44       printf ("mq_open failed with: %m\n");
  45       return 0;
  46     }
  47   else
  48     add_temp_mq (name);
  49
  50   if (seteuid (1) != 0)
  51     {
  52       printf ("failed to seteuid (1): %m\n");
  53       mq_unlink (name);
  54       return 0;
  55     }
  56
  57   int result = 0;
  58   if (mq_unlink (name) == 0)
  59     {
  60       puts ("mq_unlink unexpectedly succeeded");
  61       result = 1;
  62     }
  63   else if (errno != EACCES)
  64     {
  65       printf ("mq_unlink did not fail with EACCES: %m\n");
  66       result = 1;;
  67     }
  68
  69   if (seteuid (0) != 0)
  70     {
  71       printf ("failed to seteuid (0): %m\n");
  72       result = 1;
  73     }
  74
  75   if (mq_unlink (name) != 0)
  76     {
  77       printf ("mq_unlink failed with: %m\n");
  78       result = 1;
  79     }
  80
  81   if (mq_close (q) != 0)
  82     {
  83       printf ("mq_close failed with: %m\n");
  84       result = 1;
  85     }
  86
  87   return result;
  88 }
  89
  90 #include "../test-skeleton.c"