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Message-ID: <563d8e71-b119-f76d-3784-20f24e43f44d@linux.intel.com>
Date: Thu, 5 Jan 2017 10:56:45 -0800
From: Arjan van de Ven <arjan@...ux.intel.com>
To: Thomas Garnier <thgarnie@...gle.com>
Cc: Ingo Molnar <mingo@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, "H . Peter Anvin" <hpa@...or.com>,
Kees Cook <keescook@...omium.org>, Borislav Petkov <bp@...en8.de>,
Andy Lutomirski <luto@...nel.org>, Dave Hansen <dave@...1.net>,
Chen Yucong <slaoub@...il.com>, Paul Gortmaker
<paul.gortmaker@...driver.com>, Andrew Morton <akpm@...ux-foundation.org>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Anna-Maria Gleixner <anna-maria@...utronix.de>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Michael Ellerman <mpe@...erman.id.au>, Juergen Gross <jgross@...e.com>,
Richard Weinberger <richard@....at>,
the arch/x86 maintainers <x86@...nel.org>,
LKML <linux-kernel@...r.kernel.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
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
https://lwn.net/Articles/694385/) and for those cases it would be a shame
to lose the randomization
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