linux-kernel - Re: [PATCH 1/4] integrity: TPM internel kernel interface

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Date:	Fri, 15 Aug 2008 20:37:27 +1000
From:	"Peter Dolding" <oiaohm@...il.com>
To:	"Pavel Machek" <pavel@...e.cz>
Cc:	"Kenneth Goldman" <kgoldman@...ibm.com>,
	"Christoph Hellwig" <hch@...radead.org>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	"Mimi Zohar" <zohar@...ibm.com>
Subject: Re: [PATCH 1/4] integrity: TPM internel kernel interface

On Thu, Aug 14, 2008 at 9:12 PM, Pavel Machek <pavel@...e.cz> wrote:
> Hi!
>
>> > And what happens when the chip simply goes away due to a hotplug action?
>> > Or not even the actual chip goes away but just the chip driver and you
>> > now dereference freed memory?
>>
>> Being a TCG/TPM person, I can only address the first question.  The
>> intent is that the TPM is soldered to the planar/motherboard (the TCG
>> uses the phrase "bound to the platform").  I can't imagine
>> any manufacturer designing a pluggable TPM.  It would subvert PCR
>
> Only 2 TPMs I've seen were on pluggable modules... which was fortunate
> because they slowed down boot by 5+ minutes, and broke it completely
> in other cases. Nickname 'kurvitko' (aka useless trash that breaks
> stuff). They are currently lying under my table, disconnected.
>
> (OTOH they were not on PCI, but on some low-count pin header).
>                                                        Pavel
Remember even soldered on stuff can fail.   How linux handles the
death of the TPM module needs to be covered.

Peter Dolding
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