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Date: Tue, 9 Apr 2013 00:42:49 +0100 (BST)
From: "Maciej W. Rozycki" <macro@...ux-mips.org>
To: Kees Cook <keescook@...omium.org>
cc: Ingo Molnar <mingo@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
"x86@...nel.org" <x86@...nel.org>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Marcelo Tosatti <mtosatti@...hat.com>,
Alex Shi <alex.shi@...el.com>,
Borislav Petkov <borislav.petkov@....com>,
Alexander Duyck <alexander.h.duyck@...el.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Steven Rostedt <rostedt@...dmis.org>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
"kernel-hardening@...ts.openwall.com"
<kernel-hardening@...ts.openwall.com>,
Dan Rosenberg <drosenberg@...curity.com>,
Julien Tinnes <jln@...gle.com>, Will Drewry <wad@...omium.org>,
Eric Northup <digitaleric@...gle.com>
Subject: Re: [PATCH] x86: make IDT read-only
On Mon, 8 Apr 2013, Kees Cook wrote:
> > FWIW the change looks reasonable to me, however given that that it makes
> > the arrangement unconditional and there is no longer a workaround to
> > enable I think it would make sense to remove the conditional block quoted
> > above altogether, along with the f00f_workaround_enabled variable itself
> > (alternatively "Intel Pentium with F0 0F bug" alone could be printed
> > instead and the name of the variable adjusted to make sense with the new
> > meaning -- up to you to decide).
>
> Actually, I take it back. The other portion of the workaround is still
> active (in mm/fault.c), and this chunk announces it, so I'm going to
> leave it as-is.
Ah, OK then. Thanks for double-checking.
Maciej
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