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Message-ID: <CALCETrV1sPCzn1001tinLai2kEXOhfos4Pok3aymK3N2m8pMXw@mail.gmail.com>
Date: Sat, 7 Jan 2017 07:58:38 -0800
From: Andy Lutomirski <luto@...capital.net>
To: Ingo Molnar <mingo@...nel.org>
Cc: Andy Lutomirski <luto@...nel.org>, Thomas Garnier <thgarnie@...gle.com>,
Arjan van de Ven <arjan@...ux.intel.com>, 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>, 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>, X86 ML <x86@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Subject: Re: [RFC] x86/mm/KASLR: Remap GDTs at fixed location
On Fri, Jan 6, 2017 at 11:45 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Andy Lutomirski <luto@...nel.org> 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.)
--Andy
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