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Date: Sat, 7 Jan 2017 07:58:38 -0800
From: Andy Lutomirski <>
To: Ingo Molnar <>
Cc: Andy Lutomirski <>, Thomas Garnier <>, 
	Arjan van de Ven <>, Thomas Gleixner <>, 
	Ingo Molnar <>, "H . Peter Anvin" <>, Kees Cook <>, 
	Borislav Petkov <>, Dave Hansen <>, Chen Yucong <>, 
	Paul Gortmaker <>, Andrew Morton <>, 
	Masahiro Yamada <>, 
	Sebastian Andrzej Siewior <>, Anna-Maria Gleixner <>, 
	Boris Ostrovsky <>, Rasmus Villemoes <>, 
	Michael Ellerman <>, Juergen Gross <>, 
	Richard Weinberger <>, X86 ML <>, 
	"" <>, 
	"" <>
Subject: Re: [RFC] x86/mm/KASLR: Remap GDTs at fixed location

On Fri, Jan 6, 2017 at 11:45 PM, Ingo Molnar <> wrote:
> * Andy Lutomirski <> wrote:

>> P.S. Let's do the move to the fixmap, read/write as a separate patch. That will
>> make bisecting much easier.
> Absolutely, but this has to be within the same series, as the interim fixmap-only
> step is less secure in some circumstances: we are moving the writable GDT from a
> previously randomized location to a fixed location.

True, but despite being randomized its location was never even
remotely secret.  (Except on Kaby Lake or Foobar Lake or whatever CPU
that is.)


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