linux-kernel - Re: [PATCH] x86, CPU, AMD: Add workaround for family 16h, erratum 793

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Message-ID: <20140118113143.GA2565@amd.pavel.ucw.cz>
Date:	Sat, 18 Jan 2014 12:31:43 +0100
From:	Pavel Machek <pavel@....cz>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Kim Naru <kim.naru@....com>,
	Aravind Gopalakrishnan <aravind.gopalakrishnan@....com>,
	Sherry Hurwitz <sherry.hurwitz@....com>
Subject: Re: [PATCH] x86, CPU, AMD: Add workaround for family 16h, erratum
 793

On Sat 2014-01-18 12:26:20, Borislav Petkov wrote:
> On Sat, Jan 18, 2014 at 12:08:29PM +0100, Pavel Machek wrote:
> > ?? By the time userspace is booted, you have overwritten the MSR, and
> > information, if the BIOS is buggy, was lost.
> 
> Bullshit - if you don't apply the workaround, the bit in the MSR remains
> unset.

If you do not apply the workaround, you have the buggy system that may
or may not boot. There's even CVE for it.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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