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

[Luis R. Rodriguez]

On Wed, Nov 08, 2017 at 03:01:09PM -0500, Mimi Zohar wrote:
> 
> > > 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

Ah then yeah this makes sense to mesh into the lock down documentation.

 Luis