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/* Check CET compatibility with legacy JIT engine via GLIBC_TUNABLES.
Copyright (C) 2021 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
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <support/test-driver.h>
#include <support/xunistd.h>
/* Check that mmapped legacy code won't trigger segfault with
-fcf-protection and GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK. */
static int
do_test (void)
{
void (*funcp) (void);
funcp = xmmap (NULL, 0x1000, PROT_EXEC | PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1);
printf ("mmap = %p\n", funcp);
/* Write RET instruction. */
*(char *) funcp = 0xc3;
funcp ();
return EXIT_SUCCESS;
}
#include <support/test-driver.c>
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