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

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Message-ID: <5115553A.5000708@zytor.com>
Date:	Fri, 08 Feb 2013 11:42:50 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Kees Cook <keescook@...omium.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.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 02/08/2013 11:18 AM, Kees Cook wrote:
> No. CAP_RAWIO is for reading. Writing needs a much stronger check.
>
> -Kees

If so, I suspect we need to do this for *all* raw I/O... but I keep 
wondering how much more sensitive writing really is than reading.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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