| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Stack executability handling for GNU dynamic linker. Hurd version. |
| 2 | Copyright (C) 2004-2016 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 | <http://www.gnu.org/licenses/>. */ |
| 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 |
| 29 | internal_function |
| 30 | _dl_make_stack_executable (void **stack_endp) |
| 31 | { |
| 32 | /* Challenge the caller. */ |
| 33 | if (__builtin_expect (*stack_endp != __libc_stack_end, 0)) |
| 34 | return EPERM; |
| 35 | *stack_endp = NULL; |
| 36 | |
| 37 | #if IS_IN (rtld) |
| 38 | if (__mprotect ((void *)_dl_hurd_data->stack_base, _dl_hurd_data->stack_size, |
| 39 | PROT_READ|PROT_WRITE|PROT_EXEC) != 0) |
| 40 | return errno; |
| 41 | |
| 42 | /* Remember that we changed the permission. */ |
| 43 | GL(dl_stack_flags) |= PF_X; |
| 44 | |
| 45 | return 0; |
| 46 | #else |
| 47 | /* We don't bother to implement this for static linking. */ |
| 48 | return ENOSYS; |
| 49 | #endif |
| 50 | } |
| 51 | rtld_hidden_def (_dl_make_stack_executable) |