1 /* Check CET compatibility with legacy JIT engine via GLIBC_TUNABLES.
2 Copyright (C) 2021-2022 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 <stdio.h>
20 #include <stdlib.h>
21 #include <sys/mman.h>
22 #include <support/test-driver.h>
23 #include <support/xunistd.h>
24
25 /* Check that mmapped legacy code won't trigger segfault with
26 -fcf-protection and GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK. */
27
28 static int
do_test(void)29 do_test (void)
30 {
31 void (*funcp) (void);
32 funcp = xmmap (NULL, 0x1000, PROT_EXEC | PROT_READ | PROT_WRITE,
33 MAP_ANONYMOUS | MAP_PRIVATE, -1);
34 printf ("mmap = %p\n", funcp);
35 /* Write RET instruction. */
36 *(char *) funcp = 0xc3;
37 funcp ();
38 return EXIT_SUCCESS;
39 }
40
41 #include <support/test-driver.c>
42