glibc/stdlib/tst-strtod-overflow.c

/* Test for integer/buffer overflow in strtod.
   Copyright (C) 2012-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define EXPONENT "e-2147483649"
#define SIZE 214748364

static int
do_test (void)
{
  char *p = malloc (1 + SIZE + sizeof (EXPONENT));
  if (p == NULL)
    {
      puts ("malloc failed, cannot test for overflow");
      return 0;
    }
  p[0] = '1';
  memset (p + 1, '0', SIZE);
  memcpy (p + 1 + SIZE, EXPONENT, sizeof (EXPONENT));
  double d = strtod (p, NULL);
  if (d != 0)
    {
      printf ("strtod returned wrong value: %a\n", d);
      return 1;
    }
  return 0;
}

#define TEST_FUNCTION do_test ()
#define TIMEOUT 30
#include "../test-skeleton.c"