linux-kernel - Re: [PATCH] x86: make IDT read-only

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Message-ID: <alpine.LFD.2.03.1304090042220.25182@linux-mips.org>
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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