rt/tst-mqueue9.c

   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"