malloc/tst-malloc-backtrace.c

   1 /* Verify that backtrace does not deadlock on itself on memory corruption.
   2    Copyright (C) 2015 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
  20 #include <stdlib.h>
  21
  22 #define SIZE 4096
  23
  24 /* Wrap free with a function to prevent gcc from optimizing it out.  */
  25 static void
  26 __attribute__((noinline))
  27 call_free (void *ptr)
  28 {
  29   free (ptr);
  30   *(size_t *)(ptr - sizeof (size_t)) = 1;
  31 }
  32
  33 int do_test (void);
  34
  35 #define TEST_FUNCTION do_test ()
  36 #define EXPECTED_SIGNAL SIGABRT
  37
  38 #include "../test-skeleton.c"
  39
  40 int
  41 do_test (void)
  42 {
  43   void *ptr1 = malloc (SIZE);
  44   void *ptr2 = malloc (SIZE);
  45
  46   /* Avoid unwanted output to TTY after an expected memory corruption.  */
  47   ignore_stderr();
  48
  49   call_free (ptr1);
  50   ptr1 = malloc (SIZE);
  51
  52   /* Not reached.  The return statement is to put ptr2 into use so that gcc
  53      doesn't optimize out that malloc call.  */
  54   return (ptr1 == ptr2);
  55 }