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a803367b | 1 | /* Changing the per-thread memory protection key, powerpc64 version. |
2b778ceb | 2 | Copyright (C) 2017-2021 Free Software Foundation, Inc. |
a803367b FW |
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 <arch-pkey.h> | |
20 | #include <errno.h> | |
21 | #include <sys/mman.h> | |
22 | ||
23 | int | |
24 | pkey_set (int key, unsigned int rights) | |
25 | { | |
26 | if (key < 0 || key > PKEY_MAX || rights > 3) | |
27 | { | |
28 | __set_errno (EINVAL); | |
29 | return -1; | |
30 | } | |
31 | ||
32 | /* Translate to AMR bit values. */ | |
33 | unsigned long int bits; | |
34 | if (rights & PKEY_DISABLE_ACCESS) | |
35 | /* The PKEY_DISABLE_WRITE bit does not matter. */ | |
36 | bits = PKEY_AMR_READ | PKEY_AMR_WRITE; | |
37 | else if (rights == PKEY_DISABLE_WRITE) | |
38 | bits = PKEY_AMR_WRITE; | |
39 | else | |
40 | bits = 0; | |
41 | ||
42 | unsigned int index = pkey_index (key); | |
43 | unsigned long int mask = 3UL << index; | |
44 | unsigned long int amr = pkey_read (); | |
45 | amr = (amr & ~mask) | (bits << index); | |
46 | pkey_write (amr); | |
47 | return 0; | |
48 | } |