1  /* Test that malloc tcache catches double free.
       2     Copyright (C) 2018-2023 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 <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>