Re: [PATCH v6 1/3] efi_loader: Add check for event log passed from firmware

Hi Heinrich,

...

• /*

• * initialize log area as 0xff so the OS can easily figure out the
  

• * last log entry
  

Where is this standardized?

EFI_TCG2_PROTOCOL.GetEventLog() returns EventLogLastEntry to indicate the last log entry.

Indeed. However while I was looking into EDK2 code I found a similar comment [1]. Since EDK2 is used to boot windows as well I assumed that was a good policy to keep.

...

• */
  

• memset(event_log.buffer, 0xff, TPM2_EVENT_LOG_SIZE);
• /*

• * The log header is defined to be in SHA1 event log entry format.
  

• * Setup event header
  

• */
  

[...]

[1] https://github.com/tianocore/edk2/blob/master/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dx...

Cheers /Ilias