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

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Message-ID: <511C3927.90603@zytor.com>
Date:	Wed, 13 Feb 2013 17:08:55 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthew Garrett <matthew.garrett@...ula.com>
CC:	Casey Schaufler <casey@...aufler-ca.com>,
	Borislav Petkov <bp@...en8.de>,
	Kees Cook <keescook@...omium.org>,
	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 02/13/2013 05:04 PM, Matthew Garrett wrote:
> On Wed, 2013-02-13 at 16:44 -0800, Casey Schaufler wrote:
> 
>> If you want that sort of granularity throw yourself on the SELinux
>> bandwagon. Fine grained capabilities are insane and unmanageable
>> and will only lead to tears. Security is despised because of the
>> notion that making systems impossible to use is a good thing.
> 
> SELinux is completely unusable for this specific case.
> 

Well, for at least things with device nodes (/dev/mem, /dev/msr and so
on) it should be possible, no?  ioperm() and iopl() are another matter.

	-hpa

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