stdlib/tst-strtod-overflow.c

   1 /* Test for integer/buffer overflow in strtod.
   2    Copyright (C) 2012-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 #define EXPONENT "e-2147483649"
  24 #define SIZE 214748364
  25
  26 static int
  27 do_test (void)
  28 {
  29   char *p = malloc (1 + SIZE + sizeof (EXPONENT));
  30   if (p == NULL)
  31     {
  32       puts ("malloc failed, cannot test for overflow");
  33       return 0;
  34     }
  35   p[0] = '1';
  36   memset (p + 1, '0', SIZE);
  37   memcpy (p + 1 + SIZE, EXPONENT, sizeof (EXPONENT));
  38   double d = strtod (p, NULL);
  39   if (d != 0)
  40     {
  41       printf ("strtod returned wrong value: %a\n", d);
  42       return 1;
  43     }
  44   return 0;
  45 }
  46
  47 #define TEST_FUNCTION do_test ()
  48 #define TIMEOUT 30
  49 #include "../test-skeleton.c"