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Date: Thu, 5 Jan 2017 10:56:45 -0800
From: Arjan van de Ven <>
To: Thomas Garnier <>
Cc: Ingo Molnar <>, Thomas Gleixner <>,
 Ingo Molnar <>, "H . Peter Anvin" <>,
 Kees Cook <>, Borislav Petkov <>,
 Andy Lutomirski <>, 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 <>,
 the arch/x86 maintainers <>,
 LKML <>,
 Kernel Hardening <>,
 Linus Torvalds <>,
 Peter Zijlstra <>
Subject: Re: [RFC] x86/mm/KASLR: Remap GDTs at fixed location

On 1/5/2017 8:40 AM, Thomas Garnier wrote:
> Well, it happens only when KASLR memory randomization is enabled. Do
> you think it should have a separate config option?

no I would want it a runtime option.... "sgdt from ring 3" is going away
with UMIP (and is already possibly gone in virtual machines, see and for those cases it would be a shame
to lose the randomization

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