linux-kernel - [PATCH v2 0/4] x86: clear XD_DISABLED flag on Intel to regain NX

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Message-ID: <20100619055010.GR24749@outflux.net>
Date:	Fri, 18 Jun 2010 22:50:10 -0700
From:	Kees Cook <kees.cook@...onical.com>
To:	x86@...nel.org
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Potashev <aspotashev@...il.com>,
	Tim Abbott <tabbott@...lice.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Jan Beulich <jbeulich@...ell.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/4] x86: clear XD_DISABLED flag on Intel to regain NX

This will clear the MSR_IA32_MISC_ENABLE_XD_DISABLE bit so that NX cannot
be inappropriately controlled by the BIOS on Intel CPUs.  If NX actually
needs to be disabled, "noexec=off" can be used.

Based on feedback from HPA, this was reworked to extend the existing
"verify_cpu" routines, and to more tightly confine which CPUs will call
MSR_IA32_MISC_ENABLE.  Since it includes some re-arrangements of files, I
tried to break the patches up into their logical steps.

-Kees

-- 
Kees Cook
Ubuntu Security Team
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