math/test-nan-overflow.c

   1 /* Test nan functions stack overflow (bug 16962).
   2    Copyright (C) 2015-2023 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 <math.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <sys/resource.h>
  23 #include <stdlib.h>
  24
  25 #define STACK_LIM 1048576
  26 #define STRING_SIZE (2 * STACK_LIM)
  27
  28 static int
  29 do_test (void)
  30 {
  31   int result = 0;
  32   struct rlimit lim;
  33   getrlimit (RLIMIT_STACK, &lim);
  34   lim.rlim_cur = STACK_LIM;
  35   setrlimit (RLIMIT_STACK, &lim);
  36   char *nanstr = malloc (STRING_SIZE);
  37   if (nanstr == NULL)
  38     {
  39       puts ("malloc failed, cannot test");
  40       return 77;
  41     }
  42   memset (nanstr, '0', STRING_SIZE - 1);
  43   nanstr[STRING_SIZE - 1] = 0;
  44 #define NAN_TEST(TYPE, FUNC)                    \
  45   do                                            \
  46     {                                           \
  47       char *volatile p = nanstr;                \
  48       volatile TYPE v = FUNC (p);               \
  49       if (isnan (v))                            \
  50         puts ("PASS: " #FUNC);                  \
  51       else                                      \
  52         {                                       \
  53           puts ("FAIL: " #FUNC);                \
  54           result = 1;                           \
  55         }                                       \
  56     }                                           \
  57   while (0)
  58   NAN_TEST (float, nanf);
  59   NAN_TEST (double, nan);
  60   NAN_TEST (long double, nanl);
  61   return result;
  62 }
  63
  64 #define TEST_FUNCTION do_test ()
  65 #include "../test-skeleton.c"