linux-kernel - Re: [RFC][PATCH 3/6] verification: Introduce verify_umd_signature() and verify_umd_message

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Message-ID: <3a1cb6691bd913cadccbfaccf5ff642460eeac83.camel@kernel.org>
Date:   Wed, 26 Apr 2023 21:25:46 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>, dhowells@...hat.com,
        dwmw2@...radead.org, herbert@...dor.apana.org.au,
        davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
        sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org,
        rostedt@...dmis.org, mhiramat@...nel.org, mykolal@...com,
        shuah@...nel.org
Cc:     linux-kernel@...r.kernel.org, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, bpf@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [RFC][PATCH 3/6] verification: Introduce verify_umd_signature()
 and verify_umd_message_sig()

On Wed, 2023-04-26 at 13:42 +0200, Roberto Sassu wrote:
> On Wed, 2023-04-26 at 03:28 +0300, Jarkko Sakkinen wrote:
> > On Tue Apr 25, 2023 at 8:35 PM EEST, Roberto Sassu wrote:
> > > From: Roberto Sassu <roberto.sassu@...wei.com>
> > > 
> > > Introduce verify_umd_signature() and verify_umd_message_sig(), to verify
> > > UMD-parsed signatures from detached data. It aims to be used by kernel
> > > subsystems wishing to verify the authenticity of system data, with
> > > system-defined keyrings as trust anchor.
> > 
> > UMD is not generic knowledge. It is a term coined up in this patch set
> > so please open code it to each patch.
> 
> Yes, Linus also commented on this:
> 
> https://lwn.net/ml/linux-kernel/CAHk-=wihqhksXHkcjuTrYmC-vajeRcNh3s6eeoJNxS7wp77dFQ@mail.gmail.com/
> 
> I will check if the full name is mentioned at least once. So far, it
> seems that using umd for function names should be ok.

Also: "UMD-based parser for the asymmetric key type"

It is a tautology:

UMD is based on parser which based on UMD.

I.e. makes no sense.

Everyone hates three letter acronyms so I would consider not
inventing a new one out of the void.

So the corrective step would be to rename Kconfig flags as
USER_ASYMMETRIC_KEY_PARSER and USER_ASYMMETRIC_SIGNATURE_PARSER.

BR, Jarkko