Messages in this thread | | | Subject | Re: [PATCH] tpm: Detach page allocation from tpm_buf | From | Mimi Zohar <> | Date | Thu, 03 Oct 2019 11:24:21 -0400 |
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On Thu, 2019-10-03 at 14:33 +0300, Jarkko Sakkinen wrote:
> > > Will this delay the TPM initialization, causing IMA to go into "TPM > > > bypass mode"? > > > > Of course it will delay the init. > > > > As I've stated before the real fix for the bypass issue would be > > to make TPM as part of the core but this has not received much > > appeal. I think I've sent patch for this once.
IMA initialization is way later than the TPM. IMA is on the late_initcall(), while the TPM is on the subsys_initcall(). I'm not sure moving the TPM to core would make a difference. There must be a way of deferring IMA until after the TPM has been initialized. Any suggestions would be much appreciated.
(The TPM on the Pi still has a dependency on clock.)
> It has been like that people reject a fix to a race condition and > then I get complains on adding minor latency to the init because > of the existing race. It is ridicilous, really.
I agree, but adding any latency will cause a regression.
Mimi
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