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    SubjectRe: [PATCH 1/4] integrity: TPM internel kernel interface
    On Thu, Aug 14, 2008 at 9:12 PM, Pavel Machek <pavel@suse.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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