1  /* Check incompatibility with legacy JIT engine.
       2     Copyright (C) 2020-2023 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
      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>