| /* Stack executability handling for GNU dynamic linker. Hurd version. |
| Copyright (C) 2004 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #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 |
| internal_function |
| _dl_make_stack_executable (void **stack_endp) |
| { |
| /* Challenge the caller. */ |
| if (__builtin_expect (*stack_endp != __libc_stack_end, 0)) |
| return EPERM; |
| *stack_endp = NULL; |
| |
| #ifdef 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) |
