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316febbc | 1 | /* Stack executability handling for GNU dynamic linker. Hurd version. |
d614a753 | 2 | Copyright (C) 2004-2020 Free Software Foundation, Inc. |
316febbc RM |
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 | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
316febbc RM |
18 | |
19 | #include <ldsodefs.h> | |
20 | #include <hurdstartup.h> | |
21 | #include <errno.h> | |
22 | ||
23 | extern struct hurd_startup_data *_dl_hurd_data attribute_hidden; | |
24 | ||
25 | /* There is no portable way to know the bounds of the initial thread's stack | |
26 | so as to mprotect it. */ | |
27 | ||
28 | int | |
316febbc RM |
29 | _dl_make_stack_executable (void **stack_endp) |
30 | { | |
31 | /* Challenge the caller. */ | |
32 | if (__builtin_expect (*stack_endp != __libc_stack_end, 0)) | |
33 | return EPERM; | |
34 | *stack_endp = NULL; | |
35 | ||
a3848485 | 36 | #if IS_IN (rtld) |
316febbc RM |
37 | if (__mprotect ((void *)_dl_hurd_data->stack_base, _dl_hurd_data->stack_size, |
38 | PROT_READ|PROT_WRITE|PROT_EXEC) != 0) | |
39 | return errno; | |
40 | ||
41 | /* Remember that we changed the permission. */ | |
42 | GL(dl_stack_flags) |= PF_X; | |
43 | ||
44 | return 0; | |
fda5aa66 RM |
45 | #else |
46 | /* We don't bother to implement this for static linking. */ | |
47 | return ENOSYS; | |
48 | #endif | |
316febbc RM |
49 | } |
50 | rtld_hidden_def (_dl_make_stack_executable) |