]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/unix/sysv/linux/x86/pkey_set.c
1 /* Changing the per-thread memory protection key, x86_64 version.
2 Copyright (C) 2017-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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 <https://www.gnu.org/licenses/>. */
19 #include <arch-pkey.h>
23 pkey_set (int key
, unsigned int rights
)
25 if (key
< 0 || key
> 15 || rights
> 3)
30 unsigned int mask
= 3 << (2 * key
);
31 unsigned int pkru
= pkey_read ();
32 pkru
= (pkru
& ~mask
) | (rights
<< (2 * key
));