| /* Verify that backtrace does not deadlock on itself on memory corruption. |
| Copyright (C) 2015-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <signal.h> |
| #include <stdlib.h> |
| |
| #include <support/support.h> |
| |
| #define SIZE 4096 |
| |
| /* Wrap free with a function to prevent gcc from optimizing it out. */ |
| static void |
| __attribute__((noinline)) |
| call_free (void *ptr) |
| { |
| free (ptr); |
| *(size_t *)(ptr - sizeof (size_t)) = 1; |
| } |
| |
| int |
| do_test (void) |
| { |
| void *volatile ptr1 = malloc (SIZE); |
| void *volatile ptr2 = malloc (SIZE); |
| |
| /* Avoid unwanted output to TTY after an expected memory corruption. */ |
| ignore_stderr(); |
| |
| call_free (ptr1); |
| ptr1 = malloc (SIZE); |
| |
| /* Not reached. The return statement is to put ptr2 into use so that gcc |
| doesn't optimize out that malloc call. */ |
| return (ptr1 == ptr2); |
| } |
| |
| #define EXPECTED_SIGNAL SIGABRT |
| #include <support/test-driver.c> |