| /* Changing the per-thread memory protection key, x86_64 version. |
| Copyright (C) 2017-2018 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <arch-pkey.h> |
| #include <errno.h> |
| |
| int |
| pkey_set (int key, unsigned int rights) |
| { |
| if (key < 0 || key > 15 || rights > 3) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| unsigned int mask = 3 << (2 * key); |
| unsigned int pkru = pkey_read (); |
| pkru = (pkru & ~mask) | (rights << (2 * key)); |
| pkey_write (pkru); |
| return 0; |
| } |
