1 /* Verify that backtrace does not deadlock on itself on memory corruption. 2 Copyright (C) 2015-2021 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 <signal.h> 20 #include <stdlib.h> 21 22 #include <support/support.h> 23 24 #define SIZE 4096 25 26 /* Wrap free with a function to prevent gcc from optimizing it out. */ 27 static void 28 __attribute__((noinline)) call_free(void * ptr)29call_free (void *ptr) 30 { 31 free (ptr); 32 *(size_t *)(ptr - sizeof (size_t)) = 1; 33 } 34 35 int do_test(void)36do_test (void) 37 { 38 void *ptr1 = malloc (SIZE); 39 void *ptr2 = malloc (SIZE); 40 41 /* Avoid unwanted output to TTY after an expected memory corruption. */ 42 ignore_stderr(); 43 44 call_free (ptr1); 45 ptr1 = malloc (SIZE); 46 47 /* Not reached. The return statement is to put ptr2 into use so that gcc 48 doesn't optimize out that malloc call. */ 49 return (ptr1 == ptr2); 50 } 51 52 #define EXPECTED_SIGNAL SIGABRT 53 #include <support/test-driver.c> 54