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Date: Tue, 13 Feb 2018 13:43:49 -0800
From: Kees Cook <>
To: Laura Abbott <>
Cc: Jann Horn <>, Igor Stoppa <>, 
	Boris Lukashev <>, Christopher Lameter <>, 
	Matthew Wilcox <>, Jerome Glisse <>, 
	Michal Hocko <>, Christoph Hellwig <>, 
	linux-security-module <>, Linux-MM <>, 
	kernel list <>, 
	Kernel Hardening <>
Subject: Re: [PATCH 4/6] Protectable Memory

On Tue, Feb 13, 2018 at 8:09 AM, Laura Abbott <> wrote:
> No, arm64 doesn't fixup the aliases, mostly because arm64 uses larger
> page sizes which can't be broken down at runtime. CONFIG_PAGE_POISONING
> does use 4K pages which could be adjusted at runtime. So yes, you are
> right we would have physmap exposure on arm64 as well.

Errr, so that means even modules and kernel code are writable via the
arm64 physmap? That seems extraordinarily bad. :(


Kees Cook
Pixel Security

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