sysdeps/x86/tst-cet-legacy-7.c

   1 /* Check compatibility of legacy executable with a 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 <sys/mman.h>
  21 #include <support/xunistd.h>
  22
  23 /* Check that mmapped legacy code works with -fcf-protection=none.  */
  24
  25 static int
  26 do_test (void)
  27 {
  28   void (*funcp) (void);
  29   funcp = xmmap (NULL, 0x1000, PROT_EXEC | PROT_READ | PROT_WRITE,
  30                  MAP_ANONYMOUS | MAP_PRIVATE, -1);
  31   printf ("mmap = %p\n", funcp);
  32   /* Write RET instruction.  */
  33   *(char *) funcp = 0xc3;
  34   funcp ();
  35   return 0;
  36 }
  37
  38 #include <support/test-driver.c>