linux-kernel - Re: [PATCH v8 0/2] Add support for ECDSA-signed kernel modules

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Date:   Fri, 2 Jul 2021 09:50:13 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Stefan Berger <stefanb@...ux.vnet.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, torvalds@...ux-foundation.org,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: Re: [PATCH v8 0/2] Add support for ECDSA-signed kernel modules

On Tue, Jun 29, 2021 at 05:34:19PM -0400, Stefan Berger wrote:
> From: Stefan Berger <stefanb@...ux.ibm.com>
> 
> 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.
> 
>   Stefan
> 
> v8:
>   - Removed R-b tags and reordered Cc tags
> 
> v7:
>   - Changed Kconfig reference to kernel version from 5.11 to 5.13
>   - Redirecting stderr of openssl to NULL device to address kernel robot
>     detected issue
>   - Replaced $(CONFIG_MODULE_SIG_KEY) with "certs/signing_key.pem" following
>     Linus's suggestion
> 
> 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 (2):
>   certs: Trigger creation of RSA module signing key if it's not an RSA
>     key
>   certs: Add support for using elliptic curve keys for signing modules
> 
>  certs/Kconfig                         | 26 ++++++++++++++++++++++++++
>  certs/Makefile                        | 21 +++++++++++++++++++++
>  crypto/asymmetric_keys/pkcs7_parser.c |  8 ++++++++
>  3 files changed, 55 insertions(+)
> 
> -- 
> 2.31.1
> 
> 

LGTM

For both:

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

/Jarkko