linux-kernel - Re: [PATCH] x86: Lock down MSR writing in secure boot

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Message-ID: <20130209092925.GA17728@pd.tnic>
Date:	Sat, 9 Feb 2013 10:29:25 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Kees Cook <keescook@...omium.org>
Cc:	Matthew Garrett <matthew.garrett@...ula.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	linux-security-module <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH] x86: Lock down MSR writing in secure boot

On Fri, Feb 08, 2013 at 10:45:35PM -0800, Kees Cook wrote:
> Also, _reading_ MSRs from userspace arguably has utility that doesn't
> compromise ring-0.

And to come back to the original question: what is that utility, who
would need it on a secure boot system and why?

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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