linux-kernel - Re: Firmware signing -- Re: [PATCH 00/27] security, efi: Add kernel lockdown

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Message-Id: <1510171269.4484.26.camel@linux.vnet.ibm.com>
Date:   Wed, 08 Nov 2017 15:01:09 -0500
From:   Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     David Howells <dhowells@...hat.com>,
        linux-security-module@...r.kernel.org, gnomes@...rguk.ukuu.org.uk,
        linux-efi <linux-efi@...r.kernel.org>,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        Matthew Garrett <mjg59@...gle.com>,
        "AKASHI, Takahiro" <takahiro.akashi@...aro.org>
Subject: Re: Firmware signing -- Re: [PATCH 00/27] security, efi: Add kernel
 lockdown


> > Or reflect that IMA-appraisal, if enabled, will enforce firmware being
> > validly signed.
> 
> But FWICT lockdown is a built-in kernel thingy, unless lockdown implies IMA
> it would not be the place to refer to it.
> 
> It seems the documentation was proposed to help users if an error was caught.
> That error should cover only what is being addressed in code on the kernel.

Enabling "lockdown" needs to take into account IMA-appraisal to
prevent breaking systems with it enabled.

An IMA builtin "secure_boot" policy was already upstreamed (commit
503ceaef8e2e "ima: define a set of appraisal rules requiring file
signatures").  An additional patch, automatically enables the
"secure_boot" policy in "lockdown" mode.

Refer to this discussion and patch:
http://kernsec.org/pipermail/linux-security-module-archive/2017-October/003913.html
http://kernsec.org/pipermail/linux-security-module-archive/2017-October/003910.html

thanks,

Mimi