1  /* Test for integer/buffer overflow in strtod.
       2     Copyright (C) 2012-2023 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"