linux-kernel - Re: [PATCH 5/7] efi: Get the secure boot status [ver #3]

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Date:   Fri, 25 Nov 2016 09:30:20 +0000
From:   David Howells <dhowells@...hat.com>
To:     James Bottomley <James.Bottomley@...senPartnership.com>
Cc:     dhowells@...hat.com, lukas@...ner.de, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 5/7] efi: Get the secure boot status [ver #3]

James Bottomley <James.Bottomley@...senPartnership.com> wrote:

> Since you seem to be using this to mean "is the platform locked down?",
> this looks to be no longer complete in the UEFI 2.6 world.  If
> DeployedMode == 0, even if SecureBoot == 1 and SetupMode == 0, you can
> remove the platform key by writing 1 to AuditMode and gain control of
> the secure variables.  The lock down state becomes DeployedMode == 1,
> SecureBoot == 1 and SetupMode == 0
> 
> See the diagram on page 1817
> 
> http://www.uefi.org/sites/default/files/resources/UEFI%20Spec%202_6.pdf

How many pages?!

Does the DeployedMode variable not exist in older versions of the UEFI spec?

David