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

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Message-Id: <CS69GBAMXJ1X.1T8NO0CZUBXLG@suppilovahvero>
Date:   Wed, 26 Apr 2023 03:28:30 +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 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.

One discussion points should be what these handlers should be called.
Right now the patch set is misleads the reader to think as this was
some kind of "official" term and set to stone.

BR, Jarkko