linux-kernel - Re: [PATCH 2/2] sign-file: Remove support for signing with PKCS#7

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Message-ID: <1234920.1762961817@warthog.procyon.org.uk>
Date: Wed, 12 Nov 2025 15:36:57 +0000
From: David Howells <dhowells@...hat.com>
To: Petr Pavlu <petr.pavlu@...e.com>
Cc: dhowells@...hat.com,
    James Bottomley <James.Bottomley@...senPartnership.com>,
    David Woodhouse <dwmw2@...radead.org>,
    Luis Chamberlain <mcgrof@...nel.org>,
    Daniel Gomez <da.gomez@...nel.org>,
    Sami Tolvanen <samitolvanen@...gle.com>,
    Aaron Tomlin <atomlin@...mlin.com>, keyrings@...r.kernel.org,
    linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] sign-file: Remove support for signing with PKCS#7

Petr Pavlu <petr.pavlu@...e.com> wrote:

> In practice, since distributions now typically sign modules with SHA-2, for
> which sign-file already required CMS API support, removing the USE_PKCS7
> code shouldn't cause any issues.

We're looking at moving to ML-DSA, and the CMS support there is slightly dodgy
at the moment, so we need to hold off a bit on this change.

Patch 1, removing the option to sign with SHA-1 from the kernel is fine, but
doesn't stop things that are signed with SHA-1 from being verified.

David