linux-kernel - Re: [PATCH v7 1/3] dm: Add verity helpers for LoadPin

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Message-ID: <YsWlEmaQsIVUiKC0@redhat.com>
Date:   Wed, 6 Jul 2022 11:06:58 -0400
From:   Mike Snitzer <snitzer@...nel.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Alasdair Kergon <agk@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        linux-kernel@...r.kernel.org, dm-devel@...hat.com,
        Douglas Anderson <dianders@...omium.org>,
        linux-raid@...r.kernel.org, Song Liu <song@...nel.org>,
        linux-security-module@...r.kernel.org,
        Milan Broz <gmazyland@...il.com>
Subject: Re: [PATCH v7 1/3] dm: Add verity helpers for LoadPin

On Mon, Jun 27 2022 at 11:35P -0400,
Matthias Kaehlcke <mka@...omium.org> wrote:

> LoadPin limits loading of kernel modules, firmware and certain
> other files to a 'pinned' file system (typically a read-only
> rootfs). To provide more flexibility LoadPin is being extended
> to also allow loading these files from trusted dm-verity
> devices. For that purpose LoadPin can be provided with a list
> of verity root digests that it should consider as trusted.
> 
> Add a bunch of helpers to allow LoadPin to check whether a DM
> device is a trusted verity device. The new functions broadly
> fall in two categories: those that need access to verity
> internals (like the root digest), and the 'glue' between
> LoadPin and verity. The new file dm-verity-loadpin.c contains
> the glue functions.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> Acked-by: Kees Cook <keescook@...omium.org>

Acked-by: Mike Snitzer <snitzer@...nel.org>