stdlib/tst-strtod-overflow.c

   1 /* Test for integer/buffer overflow in strtod.
   2    Copyright (C) 2012-2020 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <support/blob_repeat.h>
  23 #include <support/test-driver.h>
  24
  25 #define EXPONENT "e-2147483649"
  26 #define SIZE 214748364
  27
  28 static int
  29 do_test (void)
  30 {
  31   struct support_blob_repeat repeat = support_blob_repeat_allocate
  32     ("0", 1, 1 + SIZE + sizeof (EXPONENT));
  33   if (repeat.size == 0)
  34     {
  35       puts ("warning: memory allocation failed, cannot test for overflow");
  36       return EXIT_UNSUPPORTED;
  37     }
  38   char *p = repeat.start;
  39   p[0] = '1';
  40   memcpy (p + 1 + SIZE, EXPONENT, sizeof (EXPONENT));
  41   double d = strtod (p, NULL);
  42   if (d != 0)
  43     {
  44       printf ("error: strtod returned wrong value: %a\n", d);
  45       return 1;
  46     }
  47   support_blob_repeat_free (&repeat);
  48   return 0;
  49 }
  50
  51 #define TEST_FUNCTION do_test ()
  52 #define TIMEOUT 30
  53 #include "../test-skeleton.c"