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Date: Wed, 29 Mar 2017 14:41:00 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Andy Lutomirski <luto@...capital.net>
Cc: Kees Cook <keescook@...omium.org>, "H. Peter Anvin" <hpa@...or.com>, 
	LKML <linux-kernel@...r.kernel.org>, Rik van Riel <riel@...hat.com>, 
	Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	"x86@...nel.org" <x86@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>, 
	Radim Krčmář <rkrcmar@...hat.com>, 
	Peter Zijlstra <peterz@...radead.org>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	Yu-cheng Yu <yu-cheng.yu@...el.com>, Masahiro Yamada <yamada.masahiro@...ionext.com>, 
	Borislav Petkov <bp@...e.de>, Christian Borntraeger <borntraeger@...ibm.com>, 
	Thomas Garnier <thgarnie@...gle.com>, Brian Gerst <brgerst@...il.com>, 
	He Chen <he.chen@...ux.intel.com>, Mathias Krause <minipli@...glemail.com>, 
	Fenghua Yu <fenghua.yu@...el.com>, Piotr Luc <piotr.luc@...el.com>, Kyle Huey <me@...ehuey.com>, 
	Len Brown <len.brown@...el.com>, KVM <kvm@...r.kernel.org>, 
	"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH] x86/fpu: move FPU state into separate cache

On Wed, Mar 29, 2017 at 2:35 PM, Andy Lutomirski <luto@...capital.net> wrote:
>
> Randomization also needs to leave thread_info at the beginning.  Can it do that?

Good point, and good question. No idea if the gcc extension can do,
but yes, it clearly needs a "you can't move this entry".

I assume it has some such capability already, because it's fairly
common to have that kind of "beginning of structure if fixed" due to
unions of structures anyway.

                 Linus

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