string/tst-strcoll-overflow.c

   1 /* Copyright (C) 2013-2016 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <locale.h>
  19 #include <stdio.h>
  20 #include <stdint.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 /* Verify that strcoll does not crash for large strings for which it cannot
  25    cache weight lookup results.  The size is large enough to cause integer
  26    overflows on 32-bit as well as buffer overflows on 64-bit.  The test should
  27    work reasonably reliably when overcommit is disabled, but it obviously
  28    depends on how much memory the system has.  There's a limitation to this
  29    test in that it does not run to completion.  Actually collating such a
  30    large string can take days and we can't have xcheck running that long.  For
  31    that reason, we run the test for about 5 minutes and then assume that
  32    everything is fine if there are no crashes.  */
  33 #define SIZE 0x40000000ul
  34
  35 int
  36 do_test (void)
  37 {
  38   if (setlocale (LC_COLLATE, "en_GB.UTF-8") == NULL)
  39     {
  40       puts ("setlocale failed, cannot test for overflow");
  41       return 0;
  42     }
  43
  44   char *p = malloc (SIZE);
  45
  46   if (p == NULL)
  47     {
  48       puts ("could not allocate memory");
  49       return 1;
  50     }
  51
  52   memset (p, 'x', SIZE - 1);
  53   p[SIZE - 1] = 0;
  54   printf ("%d\n", strcoll (p, p));
  55   return 0;
  56 }
  57
  58 #define TIMEOUT 300
  59 #define EXPECTED_SIGNAL SIGALRM
  60 #define EXPECTED_STATUS 0
  61 #define TEST_FUNCTION do_test ()
  62 #include "../test-skeleton.c"