/* Stack executability handling for GNU dynamic linker.  Hurd version.

   Copyright (C) 2004-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <ldsodefs.h>

#include <hurdstartup.h>

#include <errno.h>

extern struct hurd_startup_data *_dl_hurd_data attribute_hidden;

/* There is no portable way to know the bounds of the initial thread's stack

   so as to mprotect it.  */

int

_dl_make_stack_executable (void **stack_endp)

{

  /* Challenge the caller.  */

  if (__builtin_expect (*stack_endp != __libc_stack_end, 0))

    return EPERM;

  *stack_endp = NULL;

#if IS_IN (rtld)

  if (__mprotect ((void *)_dl_hurd_data->stack_base, _dl_hurd_data->stack_size,

		  PROT_READ|PROT_WRITE|PROT_EXEC) != 0)

    return errno;

  /* Remember that we changed the permission.  */

  GL(dl_stack_flags) |= PF_X;

  return 0;

#else

  /* We don't bother to implement this for static linking.  */

  return ENOSYS;

#endif

}

rtld_hidden_def (_dl_make_stack_executable)