1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/errno.h>
4 #include <linux/prctl.h>
5 #include <linux/random.h>
6 #include <linux/sched.h>
7 #include <asm/cpufeature.h>
8 #include <asm/pointer_auth.h>
10 int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg)
12 struct ptrauth_keys_user *keys = &tsk->thread.keys_user;
13 unsigned long addr_key_mask = PR_PAC_APIAKEY | PR_PAC_APIBKEY |
14 PR_PAC_APDAKEY | PR_PAC_APDBKEY;
15 unsigned long key_mask = addr_key_mask | PR_PAC_APGAKEY;
17 if (!system_supports_address_auth() && !system_supports_generic_auth())
21 ptrauth_keys_init_user(keys);
28 if (((arg & addr_key_mask) && !system_supports_address_auth()) ||
29 ((arg & PR_PAC_APGAKEY) && !system_supports_generic_auth()))
32 if (arg & PR_PAC_APIAKEY)
33 get_random_bytes(&keys->apia, sizeof(keys->apia));
34 if (arg & PR_PAC_APIBKEY)
35 get_random_bytes(&keys->apib, sizeof(keys->apib));
36 if (arg & PR_PAC_APDAKEY)
37 get_random_bytes(&keys->apda, sizeof(keys->apda));
38 if (arg & PR_PAC_APDBKEY)
39 get_random_bytes(&keys->apdb, sizeof(keys->apdb));
40 if (arg & PR_PAC_APGAKEY)
41 get_random_bytes(&keys->apga, sizeof(keys->apga));