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

[bugzilla-daemon@kernel.org]

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

Stefan Berger (stefanb@linux.ibm.com) changed:

           What    |Removed                     |Added
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                 CC|                            |stefanb@linux.ibm.com

--- Comment #7 from Stefan Berger (stefanb@linux.ibm.com) ---
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.

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