malloc/tst-tcfree2.c

   1 /* Test that malloc tcache catches double free.
   2    Copyright (C) 2018-2020 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 <errno.h>
  20 #include <error.h>
  21 #include <limits.h>
  22 #include <malloc.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <sys/signal.h>
  26
  27 static int
  28 do_test (void)
  29 {
  30 #define COUNT 20
  31   char * volatile ptrs[COUNT];
  32   int i;
  33
  34   /* Allocate enough small chunks so that when we free them all, the tcache
  35      is full, and the first one we freed is at the end of its linked list.  */
  36   for (i = 0; i < COUNT; i++)
  37     ptrs[i] = malloc (20);
  38   for (i = 0; i < COUNT; i++)
  39     free (ptrs[i]);
  40   free (ptrs[0]);
  41
  42   printf("FAIL: tcache double free\n");
  43   return 1;
  44 }
  45
  46 #define TEST_FUNCTION do_test
  47 #define EXPECTED_SIGNAL SIGABRT
  48 #include <support/test-driver.c>