linux-kernel - Re: [RFC PATCH v4 1/1] Add dm verity root hash pkcs7 sig validation.

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Message-ID: <ab346931-1d1b-bd2f-8314-ee4779bd44bf@gmail.com>
Date:   Mon, 17 Jun 2019 15:31:21 +0200
From:   Milan Broz <gmazyland@...il.com>
To:     Jaskaran Khurana <jaskarankhurana@...ux.microsoft.com>,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Cc:     agk@...hat.com, snitzer@...hat.com, dm-devel@...hat.com,
        jmorris@...ei.org, scottsh@...rosoft.com, ebiggers@...gle.com,
        mpatocka@...hat.com
Subject: Re: [RFC PATCH v4 1/1] Add dm verity root hash pkcs7 sig validation.

On 13/06/2019 03:06, Jaskaran Khurana wrote:
...

> Adds DM_VERITY_VERIFY_ROOTHASH_SIG_FORCE: roothash signature *must* be
> specified for all dm verity volumes and verification must succeed prior
> to creation of device mapper block device.

I had a quick discussion about this and one suggestion was
to add dm-verity kernel module parameter instead of a new config option.

The idea is that if you can control kernel boot commandline, you can add it
there with the same effect (expecting that root device is on dm-verity as well).

Isn't this better option or it is not going to work for you?

Milan