sysdeps/x86/tst-cet-legacy-8.c

   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
  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>