[Bug 219495] [TPM2] tpm_tis driver crashs during the boot time.

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219495

--- Comment #8 from jarkko@kernel.org ---
(In reply to Stefan Berger from comment #7)
> The attached parsed contents (comment 1 attachment) of
> /sys/kernel/security/tpm0/binary_bios_measurements are 476kb. I cannot say
> how much this file would be in its binary version but I would think it would
> only be like 10% of it, so like 45kb since the parsed contents also display
> whole certificate chains. I don't see why 45kb should be an issue.
> 
> Can you attach the plain binary file?
> 
> > When the TPM2 ACPI table sets the Minimum Log Length size more then 4MB, a
> > call trace occurs during the boot time. The reason is the kmalloc limits
> the
> > maximum size to 4MB for x86 arch.
> 
> 4MB would be excessive and I think would hint at a buggy BIOS. We should
> never allocate that much memory for the BIOS log.

Yeah, possibly! I'll look at the data collected so far with time as soon as I
get answer to my question-triplet :-) Just don't want to play assumptions,
that's all.

So here the interesting part is still that apparently it could be still parsed
(see my question #2).

Thanks for taking a note on this bug!

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