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Date: Wed, 20 Apr 2022 18:05:29 +0200
From: "Gerd Hoffmann" <kraxel@redhat.com>
To: "Yao, Jiewen" <jiewen.yao@intel.com>
Cc: "devel@edk2.groups.io" <devel@edk2.groups.io>,
	"Xu, Min M" <min.m.xu@intel.com>,
	Ard Biesheuvel <ardb+tianocore@kernel.org>,
	"Justen, Jordan L" <jordan.l.justen@intel.com>,
	Brijesh Singh <brijesh.singh@amd.com>,
	"Aktas, Erdem" <erdemaktas@google.com>,
	James Bottomley <jejb@linux.ibm.com>,
	Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: [edk2-devel] [PATCH V3 5/9] OvmfPkg/IntelTdx: Measure Td HobList and Configuration FV
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On Wed, Apr 20, 2022 at 09:46:13AM +0000, Yao, Jiewen wrote:
> Gerd
> I cannot agree your statement on ordering.
> 
> Smart attacker can forge the good measurement based upon the severity of vulnerability.
> 
> One famous example in 2011:
> https://invisiblethingslab.com/resources/2011/Attacking_Intel_TXT_via_SINIT_hijacking.pdf
> Because the attack happens before PCR18 measurement, the PCR18 is forged successfully.

Ok, understood.  The paper explains it nicely.

thanks,
  Gerd