misc/bug18240.c

   1 /* Test integer wraparound in hcreate.
   2    Copyright (C) 2016-2017 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 <errno.h>
  20 #include <limits.h>
  21 #include <search.h>
  22 #include <stdbool.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <sys/resource.h>
  26
  27 static void
  28 test_size (size_t size)
  29 {
  30   int res = hcreate (size);
  31   if (res == 0)
  32     {
  33       if (errno == ENOMEM)
  34         return;
  35       printf ("error: hcreate (%zu): %m\n", size);
  36       exit (1);
  37     }
  38   char *keys[100];
  39   for (int i = 0; i < 100; ++i)
  40     {
  41       if (asprintf (keys + i, "%d", i) < 0)
  42         {
  43           printf ("error: asprintf: %m\n");
  44           exit (1);
  45         }
  46       ENTRY e = { keys[i], (char *) "value" };
  47       if (hsearch (e, ENTER) == NULL)
  48         {
  49           printf ("error: hsearch (\"%s\"): %m\n", keys[i]);
  50           exit (1);
  51         }
  52     }
  53   hdestroy ();
  54
  55   for (int i = 0; i < 100; ++i)
  56     free (keys[i]);
  57 }
  58
  59 static int
  60 do_test (void)
  61 {
  62   /* Limit the size of the process, so that memory allocation will
  63      fail without impacting the entire system.  */
  64   {
  65     struct rlimit limit;
  66     if (getrlimit (RLIMIT_AS, &limit) != 0)
  67       {
  68         printf ("getrlimit (RLIMIT_AS) failed: %m\n");
  69         return 1;
  70       }
  71     long target = 100 * 1024 * 1024;
  72     if (limit.rlim_cur == RLIM_INFINITY || limit.rlim_cur > target)
  73       {
  74         limit.rlim_cur = target;
  75         if (setrlimit (RLIMIT_AS, &limit) != 0)
  76           {
  77             printf ("setrlimit (RLIMIT_AS) failed: %m\n");
  78             return 1;
  79           }
  80       }
  81   }
  82
  83   test_size (500);
  84   test_size (-1);
  85   test_size (-3);
  86   test_size (INT_MAX - 2);
  87   test_size (INT_MAX - 1);
  88   test_size (INT_MAX);
  89   test_size (((unsigned) INT_MAX) + 1);
  90   test_size (UINT_MAX - 2);
  91   test_size (UINT_MAX - 1);
  92   test_size (UINT_MAX);
  93   return 0;
  94 }
  95
  96 #define TEST_FUNCTION do_test ()
  97 #include "../test-skeleton.c"