string/tst-strcoll-overflow.c

   1 /* Copyright (C) 2013-2020 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 <locale.h>
  19 #include <stdio.h>
  20 #include <stdint.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 #include <support/check.h>
  25 #include <support/test-driver.h>
  26
  27 /* Verify that strcoll does not crash for large strings for which it
  28    cannot cache weight lookup results.  The size is large enough to
  29    cause integer overflows on 32-bit as well as buffer overflows on
  30    64-bit.  */
  31 #define SIZE 0x40000000ul
  32
  33 int
  34 do_test (void)
  35 {
  36   TEST_VERIFY_EXIT (setlocale (LC_COLLATE, "en_GB.UTF-8") != NULL);
  37
  38   char *p = malloc (SIZE);
  39   if (p == NULL)
  40     {
  41       puts ("info: could not allocate memory, cannot run test");
  42       return EXIT_UNSUPPORTED;
  43     }
  44
  45   memset (p, 'x', SIZE - 1);
  46   p[SIZE - 1] = 0;
  47   printf ("info: strcoll result: %d\n", strcoll (p, p));
  48   return 0;
  49 }
  50
  51 /* This test can rung for a long time, but it should complete within
  52    this time on reasonably current hardware.  */
  53 #define TIMEOUT 300
  54 #include <support/test-driver.c>