linux-kernel - Re: [PATCH v3] x86: use a read-only IDT alias on all CPUs

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Message-ID: <m261ztxp55.fsf@firstfloor.org>
Date:	Thu, 11 Apr 2013 04:50:14 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Kees Cook <keescook@...omium.org>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Alex Shi <alex.shi@...el.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Will Drewry <wad@...omium.org>, Julien Tinnes <jln@...gle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Dan Rosenberg <drosenberg@...curity.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <borislav.petkov@....com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	kernel-hardening@...ts.openwall.com,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xensource.com
Subject: Re: [PATCH v3] x86: use a read-only IDT alias on all CPUs

Ingo Molnar <mingo@...nel.org> writes:
>
> This looks very nice to me now. Peter, any objections?

it seems pointless without randomized main kernel text location, because
the IDT will be still at a known per kernel fixed writable location in
the direct mapping.

As long as such randomization is not there it just wastes a TLB entry.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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