projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 316febbc | 1 | /* Stack executability handling for GNU dynamic linker. Hurd version. |
| 04277e02 | 2 | Copyright (C) 2004-2019 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 PE |
16 | License along with the GNU C Library; if not, see |
| 17 | <http://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) |