From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Petr Pavlu <petr.pavlu@suse.com>
Cc: David Howells <dhowells@redhat.com>,
David Woodhouse <dwmw2@infradead.org>,
Luis Chamberlain <mcgrof@kernel.org>,
Daniel Gomez <da.gomez@kernel.org>,
Sami Tolvanen <samitolvanen@google.com>,
Aaron Tomlin <atomlin@atomlin.com>,
keyrings@vger.kernel.org, linux-modules@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] sign-file: Remove support for signing with PKCS#7
Date: Wed, 12 Nov 2025 10:05:57 -0500 [thread overview]
Message-ID: <a78b70383de5fbde95bd853f1c52eace114e9c69.camel@HansenPartnership.com> (raw)
In-Reply-To: <e624c242-b297-4bb7-a76a-cbb18b027472@suse.com>
On Wed, 2025-11-12 at 14:51 +0100, Petr Pavlu wrote:
> On 11/11/25 5:53 PM, James Bottomley wrote:
> > On Tue, 2025-11-11 at 16:48 +0100, Petr Pavlu wrote:
> > > The PKCS#7 code in sign-file allows for signing only with SHA-1.
> > > Since SHA-1 support for module signing has been removed, drop
> > > PKCS#7 support in favor of using only CMS.
> >
> > The change log is a bit alarmist. CMS really *is* PKCS7 and most
> > literature will refer to CMS as PKCS7. What you're really
> > deprecating is the use of the PKCS7_sign() API which can only
> > produce SHA-1 Signatures ... openssl is fully capable of producing
> > any hash PKCS7 signatures using a different PKCS7_... API set but
> > the CMS_... API is newer.
> >
> > The point being the module signature type is still set to
> > PKEY_ID_PKCS7 so it doesn't square with the commit log saying "drop
> > PKCS#7 support". What you really mean is only use the openssl
> > CMS_... API for producing PKCS7 signatures.
>
> Ok, I plan to update the description to the following in v2:
>
> sign-file: Use only the OpenSSL CMS API for signing
>
> The USE_PKCS7 code in sign-file utilizes PKCS7_sign(), which allows
> signing only with SHA-1. Since SHA-1 support for module signing has
> been removed, drop the use of the OpenSSL PKCS7 API by the tool in
> favor of using only the newer CMS API.
Much better, thanks!
Regards,
James
next prev parent reply other threads:[~2025-11-12 15:05 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-11 15:48 [PATCH 0/2] module: Remove SHA-1 support for module signing Petr Pavlu
2025-11-11 15:48 ` [PATCH 1/2] " Petr Pavlu
2025-11-11 22:37 ` Aaron Tomlin
2025-11-11 15:48 ` [PATCH 2/2] sign-file: Remove support for signing with PKCS#7 Petr Pavlu
2025-11-11 16:53 ` James Bottomley
2025-11-12 13:51 ` Petr Pavlu
2025-11-12 15:05 ` James Bottomley [this message]
2025-11-12 15:36 ` David Howells
2025-11-12 15:47 ` James Bottomley
2025-11-12 15:52 ` David Howells
2025-11-12 15:58 ` James Bottomley
2026-02-02 11:24 ` [PATCH] sign-file, pkcs7: Honour the hash parameter to sign-file David Howells
2026-02-02 11:27 ` David Howells
2026-02-02 12:25 ` Petr Pavlu
2026-02-02 17:01 ` Sami Tolvanen
2025-11-11 16:22 ` [PATCH 0/2] module: Remove SHA-1 support for module signing Sami Tolvanen
2025-12-22 20:24 ` Sami Tolvanen
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