1 /* Stack executability handling for GNU dynamic linker. Hurd version.
2 Copyright (C) 2004-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
20 #include <hurdstartup.h>
23 extern struct hurd_startup_data
*_dl_hurd_data attribute_hidden
;
25 /* There is no portable way to know the bounds of the initial thread's stack
26 so as to mprotect it. */
29 _dl_make_stack_executable (void **stack_endp
)
31 /* Challenge the caller. */
32 if (__builtin_expect (*stack_endp
!= __libc_stack_end
, 0))
37 if (__mprotect ((void *)_dl_hurd_data
->stack_base
, _dl_hurd_data
->stack_size
,
38 PROT_READ
|PROT_WRITE
|PROT_EXEC
) != 0)
41 /* Remember that we changed the permission. */
42 GL(dl_stack_flags
) |= PF_X
;
46 /* We don't bother to implement this for static linking. */
50 rtld_hidden_def (_dl_make_stack_executable
)