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HP Recommended
HP ProBook 445 G8 Notebook PC (2U741AV)

Do HP Probook models honor the EFI variable MemoryOverwriteRequestControl directive as per the  "TCG PC Client Platform Reset Attack Mitigation Specification"[1] document? Is RAM wiped on reboot?

 

I was able to verify that MemoryOverwriteRequestControlLock works - writing to neither variable works after the lock is set.

I was also able to verify that both variables are unset after boot.

I could not verify whether or not memory is wiped.

 

To test/use on linux:

 

chattr -i /sys/firmware/efi/efivars/MemoryOverwriteRequestControl-e20939be-32d4-41be-a150-897f85d49829
printf "\07\00\00\00\01" > /sys/firmware/efi/efivars/MemoryOverwriteRequestControl-e20939be-32d4-41be-a150-897f85d49829

chattr -i /sys/firmware/efi/efivars/MemoryOverwriteRequestControlLock-bb983ccf-151d-40e1-a07b-4a17be168292
printf "\07\00\00\00\01" > /sys/firmware/efi/efivars/MemoryOverwriteRequestControlLock-bb983ccf-151d-40e1-a07b-4a17be168292

 

 

[1] https://trustedcomputinggroup.org/wp-content/uploads/TCG_PlatformResetAttackMitigationSpecification_...

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