linux-kernel - Re: [PATCH v6 0/4] Add support for ECDSA-signed kernel modules

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Message-ID: <20210615130504.ngizto6nv33qqirf@kernel.org>
Date:   Tue, 15 Jun 2021 16:05:04 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Stefan Berger <stefanb@...ux.ibm.com>
Cc:     jeyu@...nel.org, keyrings@...r.kernel.org, dhowells@...hat.com,
        dwmw2@...radead.org, zohar@...ux.ibm.com, nayna@...ux.ibm.com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 0/4] Add support for ECDSA-signed kernel modules

On Mon, Jun 14, 2021 at 03:20:43PM -0400, Stefan Berger wrote:
> 
> On 6/14/21 3:19 PM, Jarkko Sakkinen wrote:
> > On Thu, Jun 10, 2021 at 08:56:19AM -0400, Stefan Berger wrote:
> > > This series adds support for ECDSA-signed kernel modules. It also
> > > attempts to address a kbuild issue where a developer created an ECDSA
> > > key for signing kernel modules and then builds an older version of the
> > > kernel, when bisecting the kernel for example, that does not support
> > > ECDSA keys.
> > > 
> > > The first patch addresses the kbuild issue of needing to delete that
> > > ECDSA key if it is in certs/signing_key.pem and trigger the creation
> > > of an RSA key. However, for this to work this patch would have to be
> > > backported to previous versions of the kernel but would also only work
> > > for the developer if he/she used a stable version of the kernel to which
> > > this patch was applied. So whether this patch actually achieves the
> > > wanted effect is not always guaranteed.
> > > 
> > > The 2nd patch adds the support for the ECSDA-signed kernel modules.
> > > 
> > > This patch depends on the ECDSA support series currently queued here:
> > > https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git/log/?h=ecc
> > > 
> > >    Stefan
> > > 
> > > v6:
> > >    - Patch 2/4 is fixing V4's 1/2 and 4/4 is fixing V4's 2/2. Both fixup
> > >      patches to be squashed.
> > > 
> > > v5:
> > >    - do not touch the key files if openssl is not installed; likely
> > >      addresses an issue pointed out by kernel test robot
> > > 
> > > v4:
> > >    - extending 'depends on' with MODULES to (IMA_APPRAISE_MODSIG && MODULES)
> > > v3: - added missing OIDs for ECDSA signed hashes to pkcs7_sig_note_pkey_algo
> > >    - added recommendation to use string hash to Kconfig help text
> > > 
> > > v2:
> > >    - Adjustment to ECDSA key detector string in 2/2
> > >    - Rephrased cover letter and patch descriptions with Mimi
> > > 
> > > 
> > > Stefan Berger (4):
> > >    certs: Trigger creation of RSA module signing key if it's not an RSA
> > >      key
> > >    certs: Check whether openssl tool is available
> > >    certs: Add support for using elliptic curve keys for signing modules
> > >    certs: Adjustment due to 'Check whether openssl tool is available'
> > > 
> > >   certs/Kconfig                         | 26 ++++++++++++++++++++++++++
> > >   certs/Makefile                        | 21 +++++++++++++++++++++
> > >   crypto/asymmetric_keys/pkcs7_parser.c |  8 ++++++++
> > >   3 files changed, 55 insertions(+)
> > > 
> > > -- 
> > > 2.29.2
> > > 
> > > 
> > Since you know the commit ID's in
> > 
> >    git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git
> > 
> > you could just use fixes-tags and send exactly two patch series. Works
> > better with various tools (e.g. https://pypi.org/project/b4/)
> > 
> > /Jarkko
> 
> 
> So you are not taking v6's 2/4 and 4/4 ?

I applied the fixes and squashed them to appriopriate commits.

/Jarkko