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

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Message-ID: <1235767.1762962760@warthog.procyon.org.uk>
Date: Wed, 12 Nov 2025 15:52:40 +0000
From: David Howells <dhowells@...hat.com>
To: James Bottomley <James.Bottomley@...senPartnership.com>
Cc: dhowells@...hat.com, Petr Pavlu <petr.pavlu@...e.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

James Bottomley <James.Bottomley@...senPartnership.com> wrote:

> > 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.
> 
> How will removing PKCS7_sign, which can only do sha1 signatures affect
> that? Is the dodginess that the PKCS7_... API is better than CMS_...
> for PQS at the moment?  In which case we could pretty much do a rip and
> replace of the CMS_ API if necessary, but that would be a completely
> separate patch.

OpenSSL-3.5.1's ML-DSA support isn't completely right - in particular
CMS_NOATTR is not currently supported.  I believe there is a fix in the works
there, but I doubt it has made it to all the distributions yet.  I'm only
asking that we hold off a cycle; that will probably suffice.

David