1/* Check incompatibility with legacy JIT engine.
2 Copyright (C) 2020-2024 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/platform/x86.h>
22#include <sys/mman.h>
23#include <support/test-driver.h>
24#include <support/xsignal.h>
25#include <support/xunistd.h>
26
27/* Check that mmapped legacy code trigges segfault with -fcf-protection. */
28
29static int
30do_test (void)
31{
32 void (*funcp) (void);
33 funcp = xmmap (NULL, length: 0x1000, PROT_EXEC | PROT_READ | PROT_WRITE,
34 MAP_ANONYMOUS | MAP_PRIVATE, fd: -1);
35 printf (format: "mmap = %p\n", funcp);
36 /* Write RET instruction. */
37 *(char *) funcp = 0xc3;
38 funcp ();
39
40 /* NB: This test should trigger SIGSEGV when IBT is active. We should
41 reach here if IBT isn't active. */
42 if (!CPU_FEATURE_ACTIVE (IBT))
43 return EXIT_UNSUPPORTED;
44
45 return EXIT_FAILURE;
46}
47
48#define EXPECTED_SIGNAL (CPU_FEATURE_ACTIVE (IBT) ? SIGSEGV : 0)
49#include <support/test-driver.c>
50

source code of glibc/sysdeps/x86_64/tst-cet-legacy-8.c