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Date: Tue, 25 Jul 2017 10:13:19 -0700
From: Kees Cook <>
To: Ard Biesheuvel <>, Li Kun <>
Cc: "" <>, 
	"" <>, Will Deacon <>, 
	Mark Rutland <>, Laura Abbott <>
Subject: Re: [RFC PATCH untested] arm64: kernel: implement fast refcount checking

On Tue, Jul 25, 2017 at 4:49 AM, Ard Biesheuvel
<> wrote:
> Hi all,
> I had a stab at porting the fast refcount checks to arm64. It is slightly
> less straight-forward than x86 given that we need to support both LSE and
> LL/SC, and fallback to the latter if running a kernel built with support
> for the former on hardware that does not support it.
> It is build tested with and without LSE support, and boots fine on non-LSE
> hardware in both cases.

Ah! Very cool. Hopefully you and Li can compare notes; I think they've
been working on an implementation too.

> Suggestions welcome as to how to test and/or benchmark this,

I'll post a patch for LKDTM that I've been using. It's more
comprehensive than the existing ATOMIC checks (which predated the
refcount-only protection).


Kees Cook
Pixel Security

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