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

[Christoph Hellwig]

On Mon, Aug 11, 2008 at 05:13:51PM -0400, Mimi Zohar wrote:
> 
> I assume the concern here is that between looking up the chip and actually 
> 
> using the chip, the TPM chip is disabled/deactivated.  Based on 
> discussions 
> with Kenneth Goldman, the TCG main specification part2: structures, 
> require
> that even if the TPM is disabled/deactivated, the command to extend the 
> PCR 
> will succeed, but the command to read the PCR will fail with an 
> appropriate 
> error code.

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?

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