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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | ||
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> | |
9 | ||
10 | int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg) | |
11 | { | |
84931327 | 12 | struct ptrauth_keys *keys = &tsk->thread.keys_user; |
ba830885 KM |
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; | |
16 | ||
17 | if (!system_supports_address_auth() && !system_supports_generic_auth()) | |
18 | return -EINVAL; | |
19 | ||
20 | if (!arg) { | |
21 | ptrauth_keys_init(keys); | |
22 | ptrauth_keys_switch(keys); | |
23 | return 0; | |
24 | } | |
25 | ||
26 | if (arg & ~key_mask) | |
27 | return -EINVAL; | |
28 | ||
29 | if (((arg & addr_key_mask) && !system_supports_address_auth()) || | |
30 | ((arg & PR_PAC_APGAKEY) && !system_supports_generic_auth())) | |
31 | return -EINVAL; | |
32 | ||
33 | if (arg & PR_PAC_APIAKEY) | |
34 | get_random_bytes(&keys->apia, sizeof(keys->apia)); | |
35 | if (arg & PR_PAC_APIBKEY) | |
36 | get_random_bytes(&keys->apib, sizeof(keys->apib)); | |
37 | if (arg & PR_PAC_APDAKEY) | |
38 | get_random_bytes(&keys->apda, sizeof(keys->apda)); | |
39 | if (arg & PR_PAC_APDBKEY) | |
40 | get_random_bytes(&keys->apdb, sizeof(keys->apdb)); | |
41 | if (arg & PR_PAC_APGAKEY) | |
42 | get_random_bytes(&keys->apga, sizeof(keys->apga)); | |
43 | ||
44 | ptrauth_keys_switch(keys); | |
45 | ||
46 | return 0; | |
47 | } |