Re: [PATCH 1/2] kasan: arm64: set TCR_EL1.TBID1 when enabled
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2020-11-25 18:56:19
Also in:
linux-api
On Sat, 21 Nov 2020 01:59:02 -0800, Peter Collingbourne wrote:
On hardware supporting pointer authentication, we previously ended up enabling TBI on instruction accesses when tag-based ASAN was enabled, but this was costing us 8 bits of PAC entropy, which was unnecessary since tag-based ASAN does not require TBI on instruction accesses. Get them back by setting TCR_EL1.TBID1.
Applied to arm64 (for-next/misc), thanks!
[1/2] kasan: arm64: set TCR_EL1.TBID1 when enabled
https://git.kernel.org/arm64/c/49b3cf035edc
This patch looks safe. Patch 2/2 needs more discussions.
--
Catalin
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