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0a3c6e82bf
As part of the Boothole fixes, shim has introduced an
SBAT feature https://github.com/rhboot/shim/blob/main/SBAT.md.
SBAT configuration is configured to log to PCR7 using
EV_EFI_VARIABLE_AUTHORITY.
493bd940e5/mok.c (L228-L247)
This causes issue with ParseUEFIVariableAuthority, as
it asssumes that an event with type EV_EFI_VARIABLE_AUTHORITY
can be parsed as EFI_SIGNATURE_DATA, per section 3.3.4.8
of the TCG PC Client Platform Firmware Profile Specification.