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Re: Linux DRTM on UEFI platforms

From: Matthew Garrett
Subject: Re: Linux DRTM on UEFI platforms
Date: Fri, 8 Jul 2022 05:56:38 +0100
User-agent: Mutt/1.10.1 (2018-07-13)

On Fri, Jul 08, 2022 at 01:06:19PM +0930, Brendan Trotter wrote:

> This leaves me wondering what your true motivation is. Are you trying
> to benefit GRUB/Trenchboot (at the expense of security, end-user
> convenience, distro installer hassle, etc); or trying to manufacture
> scope for future man-in-the middle attacks (by promoting a solution
> that requires something between firmware and kernel)?

The described mechanism doesn't require trusting the code that's in the 
middle - if the state is perturbed by this code, the measurements will 
be different, and the system will be untrusted. I agree that this 
implementation is more complicated than just leaving it all up to the 
kernel, but I'm having a *lot* of trouble seeing how this has any impact 
on its security. Jumping immediately to impugning the motivation of the 
people involved is entirely inappropriate.

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