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

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Message-ID: <CAKv+Gu_JxNLDjaK5jGbX9ACzM0uHJYMOFx7XDo4t7DtBMtFRGA@mail.gmail.com>
Date:   Fri, 25 Nov 2016 09:52:28 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     David Howells <dhowells@...hat.com>
Cc:     James Bottomley <James.Bottomley@...senpartnership.com>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        Lukas Wunner <lukas@...ner.de>, keyrings@...r.kernel.org,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 5/7] efi: Get the secure boot status [ver #3]

On 25 November 2016 at 09:30, David Howells <dhowells@...hat.com> wrote:
> 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?
>

No, it was added in 2.6