linux-kernel - Re: [PATCH v1 0/9] Enable root to update the blacklist keyring

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Date:   Fri, 04 Dec 2020 14:01:36 +0000
From:   David Howells <dhowells@...hat.com>
To:     =?UTF-8?Q?Micka=c3=abl_Sala=c3=bcn?= <mic@...ikod.net>
Cc:     dhowells@...hat.com, Jarkko Sakkinen <jarkko@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        "David S . Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        James Morris <jmorris@...ei.org>,
        =?UTF-8?Q?Micka=c3=abl_Sala=c3=bcn?= <mic@...ux.microsoft.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        "Serge E . Hallyn" <serge@...lyn.com>, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH v1 0/9] Enable root to update the blacklist keyring

Mickaël Salaün <mic@...ikod.net> wrote:

> > What would be easiest way to smoke test the changes?
> 
> An easy way to test it is to enable the second trusted keyring to
> dynamically load certificates in the kernel. Then we can create a hash
> of a valid certificate (but not loaded yet) and sign it as explained in
> tools/certs/print-cert-tbs-hash.sh (patch 9/9). Once this hash is loaded
> in the kernel, loading the blacklisted certificate will be denied. We
> can also test it with a PKCS#7 signature chain, either with the
> blacklist keyring itself, or with a signed dm-verity image.

It might also be possible to use the pkcs#7 test key type
(CONFIG_PKCS7_TEST_KEY) to aid in that.

David