linux-kernel - Re: [PATCH] certs: Add support for using elliptic curve keys for signing modules

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Date:   Fri, 19 Feb 2021 11:52:30 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        keyrings@...r.kernel.org, dhowells@...hat.com, dwmw2@...radead.org,
        linux-security-module@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        nayna@...ux.ibm.com, saulo.alessandre@...il.com,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: Re: [PATCH] certs: Add support for using elliptic curve keys for
 signing modules

On Fri, 2021-02-19 at 10:41 -0500, Stefan Berger wrote:
> From: Stefan Berger <stefanb@...ux.ibm.com>
> 
> This patch adds support for using elliptic curve keys for signing
> modules. It uses a NIST P256 (prime256v1) key if the user chooses an
> elliptic curve key.
> 
> A developer choosing an ECDSA key for signing modules has to manually
> delete the signing key (rm certs/signing_key.*) when falling back to
> an older version of a kernel that only supports RSA key since otherwise
> ECDSA-signed modules will not be usable when that older kernel runs.
> 
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>

Thanks, Stefan!

Tested with this patch applied on top of "[PATCH v8 0/4] Add support
for x509 certs with NIST p256 and p192" and "[PATCH v2 0/5] ima: kernel
build support for loading the kernel module" patch sets.

Tested-by: Mimi Zohar <zohar@...ux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>