linux-kernel - Re: [PATCH] x86, microcode: Make reload interface per system

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Message-ID: <20120619102250.GA787@aftab.osrc.amd.com>
Date:	Tue, 19 Jun 2012 12:22:50 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Borislav Petkov <bp@...64.org>, "H. Peter Anvin" <hpa@...or.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	LKML <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Dimitri Sivanich <sivanich@....com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Greg Kroah-Hartman <greg@...ah.com>
Subject: Re: [PATCH] x86, microcode: Make reload interface per system

On Tue, Jun 19, 2012 at 10:17:44AM +0200, Peter Zijlstra wrote:
> On Tue, 2012-06-19 at 07:11 +0200, Borislav Petkov wrote:
> > $ rmmod microcode; modprobe microcode
> > 
> > but then the same guys come :-) and say they don't want to reload
> > modules for security reasons. 
> 
> Nah, they built their kernel without modules, much more secure!

Not secure enough - they don't get microcode then (ucode loader uses
request_firmware()) and has to be module for the initial load, at least.

But I haven't tested what happens when it is built in and I use the
reload interface, hehe something to play with today.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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