1 /* Check incompatibility with legacy JIT engine.
2    Copyright (C) 2020-2021 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 <stdio.h>
20 #include <stdlib.h>
21 #include <x86intrin.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 
29 static int
do_test(void)30 do_test (void)
31 {
32   /* NB: This test should trigger SIGSEGV on CET platforms.  If SHSTK
33      is disabled, assuming IBT is also disabled.  */
34   if (_get_ssp () == 0)
35     return EXIT_UNSUPPORTED;
36 
37   void (*funcp) (void);
38   funcp = xmmap (NULL, 0x1000, PROT_EXEC | PROT_READ | PROT_WRITE,
39 		 MAP_ANONYMOUS | MAP_PRIVATE, -1);
40   printf ("mmap = %p\n", funcp);
41   /* Write RET instruction.  */
42   *(char *) funcp = 0xc3;
43   funcp ();
44   return EXIT_FAILURE;
45 }
46 
47 #define EXPECTED_SIGNAL (_get_ssp () == 0 ? 0 : SIGSEGV)
48 #include <support/test-driver.c>
49