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arm64: ptr auth: Move per-thread keys from thread_info to thread_struct

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We don't need to get at the per-thread keys from assembly at all, so
they can live alongside the rest of the per-thread register state in
thread_struct instead of thread_info.

This will also allow straighforward whitelisting of the keys for
hardened usercopy should we expose them via a ptrace request later on.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2018-12-13 13:14:06 +00:00
parent 04ca3204fa
commit 84931327a8
4 changed files with 7 additions and 8 deletions
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2
arch/arm64/kernel/pointer_auth.c
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@ -9,7 +9,7 @@
int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg)
{
struct ptrauth_keys *keys = &tsk->thread_info.keys_user;
struct ptrauth_keys *keys = &tsk->thread.keys_user;
unsigned long addr_key_mask = PR_PAC_APIAKEY | PR_PAC_APIBKEY |
PR_PAC_APDAKEY | PR_PAC_APDBKEY;
unsigned long key_mask = addr_key_mask | PR_PAC_APGAKEY;