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