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63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* Verify that backtrace does not deadlock on itself on memory corruption.
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Copyright (C) 2015-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <signal.h>
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#include <stdlib.h>
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#include <support/support.h>
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#include <libc-diag.h>
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#define SIZE 4096
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/* Wrap free with a function to prevent gcc from optimizing it out. */
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static void
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__attribute__((noinline))
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call_free (void *ptr)
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{
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free (ptr);
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#if __GNUC_PREREQ (12, 0)
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/* Ignore a valid warning about using a pointer made indeterminate
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by a prior call to free(). */
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DIAG_IGNORE_NEEDS_COMMENT (12, "-Wuse-after-free");
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#endif
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*(size_t *)(ptr - sizeof (size_t)) = 1;
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#if __GNUC_PREREQ (12, 0)
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DIAG_POP_NEEDS_COMMENT;
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#endif
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}
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int
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do_test (void)
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{
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void *ptr1 = malloc (SIZE);
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void *ptr2 = malloc (SIZE);
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/* Avoid unwanted output to TTY after an expected memory corruption. */
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ignore_stderr();
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call_free (ptr1);
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ptr1 = malloc (SIZE);
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/* Not reached. The return statement is to put ptr2 into use so that gcc
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doesn't optimize out that malloc call. */
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return (ptr1 == ptr2);
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}
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#define EXPECTED_SIGNAL SIGABRT
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#include <support/test-driver.c>
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