linux-kernel - Re: [PATCH v4 0/3] LoadPin: Enable loading from trusted dm-verity devices

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 18 May 2022 12:23:10 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        linux-security-module@...r.kernel.org, dm-devel@...hat.com,
        linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        Song Liu <song@...nel.org>,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH v4 0/3] LoadPin: Enable loading from trusted dm-verity
 devices

On Tue, May 17, 2022 at 04:34:54PM -0700, Matthias Kaehlcke wrote:
> As of now LoadPin restricts loading of kernel files to a single pinned
> filesystem, typically the rootfs. This works for many systems, however it
> can result in a bloated rootfs (and OTA updates) on platforms where
> multiple boards with different hardware configurations use the same rootfs
> image. Especially when 'optional' files are large it may be preferable to
> download/install them only when they are actually needed by a given board.
> Chrome OS uses Downloadable Content (DLC) [1] to deploy certain 'packages'
> at runtime. As an example a DLC package could contain firmware for a
> peripheral that is not present on all boards. DLCs use dm-verity [2] to
> verify the integrity of the DLC content.

For the coming v5 (which will fix the 0-day reports), if I can get some
Acks from the dm folks, I can carry this with other loadpin changes in
my tree. Though I'm fine with this going via the dm tree, too:

Acked-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook