sysdeps/x86/tst-cet-legacy-9.c

   1 /* Check CET compatibility with legacy JIT engine via GLIBC_TUNABLES.
   2    Copyright (C) 2021-2024 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/mman.h>
  22 #include <support/test-driver.h>
  23 #include <support/xunistd.h>
  24
  25 /* Check that mmapped legacy code won't trigger segfault with
  26    -fcf-protection and GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK.  */
  27
  28 static int
  29 do_test (void)
  30 {
  31   void (*funcp) (void);
  32   funcp = xmmap (NULL, 0x1000, PROT_EXEC | PROT_READ | PROT_WRITE,
  33                  MAP_ANONYMOUS | MAP_PRIVATE, -1);
  34   printf ("mmap = %p\n", funcp);
  35   /* Write RET instruction.  */
  36   *(char *) funcp = 0xc3;
  37   funcp ();
  38   return EXIT_SUCCESS;
  39 }
  40
  41 #include <support/test-driver.c>