linux-hardening - Re: [RFC PATCH 0/8] x86_64: Harden compressed kernel, part 1

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Message-ID: <09c1c94fb9c5006199d88caa88f237a3@ispras.ru>
Date:   Thu, 04 Aug 2022 13:41:58 +0300
From:   Evgeniy Baskov <baskov@...ras.ru>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        linux-hardening@...r.kernel.org
Subject: Re: [RFC PATCH 0/8] x86_64: Harden compressed kernel, part 1

On 2022-08-03 17:05, Dave Hansen wrote:
> 
> That shows me that it's _possible_ to build a more strict PE loader 
> that
> wouldn't load Linux.  But, in practice is anyone using a more strict PE
> loader?  Does anyone actually want that in practice?  Or, again, is 
> this
> more strict PE loader just an academic demonstration?
> 
> The README starts:
> 
> 	This branch demonstrates...
> 
> That doesn't seem like something that's _important_ to deal with.
> Sounds like a proof-of-concept.
> 
> Don't get me wrong, I'm all for improving thing, even if the benefits
> are far off.  But, let's not fool ourselves.

We have commercial closed-source UEFI firmware implementation at ISP RAS
that follows the behavior of the secure_pe branch. That firmware is used
as a part of [1].

[1] https://www.ispras.ru/en/technologies/asperitas/

Thanks,
Evgeniy Baskov