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From: heyi.guo@linaro.org
To: edk2-devel@lists.01.org
Cc: Chao Zhang <chao.b.zhang@intel.com>, Jiewen Yao <jiewen.yao@intel.com>
Subject: Question about SecurityPkg/DxeTcg2PhysicalPresenceLib
Date: Fri, 10 Aug 2018 16:49:50 +0800	[thread overview]
Message-ID: <20180810084950.GA32368@ecs-e536.expressvpn> (raw)

Hi folks,

The function Tcg2PhysicalPresenceLibProcessRequest in DxeTcg2PhysicalPresenceLib
requires to be invoked after console is ready, and in the function it will call
VariableLockProtocol->RequestToLock(), while variable RequestToLock() requires
to be called before "End Of Dxe" event, or else it will return ACCESS_DENIED. 

However, in PI spec 1.6, section 5.1.2.1 "End of DXE Event", it says "Prior to
connecting consoles, the platform should signal the event 'End of DXE'". So
there seems to be contradiction between these implementations and PI spec.

If we follow below work flow:
End of DXE -> connect console -> Tcg2PhysicalPresenceLibProcessRequest() ->
Variable RequestToLock() -> we will get ACCESS_DENIED.

Please advise,

Thanks,

Heyi


             reply	other threads:[~2018-08-10  8:49 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-10  8:49 heyi.guo [this message]
2018-08-10  9:12 ` Question about SecurityPkg/DxeTcg2PhysicalPresenceLib Yao, Jiewen
2018-08-13  1:07   ` heyi.guo
2018-08-13  1:10     ` Yao, Jiewen
2018-08-14  6:18       ` heyi.guo
2018-08-14 14:51         ` Laszlo Ersek

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