linux-kernel - Re: [PATCH v9 0/4] Check codeSigning extended key usage extension

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Message-ID: <YwrhT0YLb87PtuEk@kernel.org>
Date:   Sun, 28 Aug 2022 06:30:23 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     "Lee, Chun-Yi" <joeyli.kernel@...il.com>
Cc:     David Howells <dhowells@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Ben Boeckel <me@...boeckel.net>,
        Randy Dunlap <rdunlap@...radead.org>,
        Malte Gell <malte.gell@....de>,
        Varad Gautam <varad.gautam@...e.com>,
        Mimi Zohar <zohar@...ux.ibm.com>, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Lee, Chun-Yi" <jlee@...e.com>
Subject: Re: [PATCH v9 0/4] Check codeSigning extended key usage extension

On Thu, Aug 25, 2022 at 10:23:10PM +0800, Lee, Chun-Yi wrote:
> NIAP PP_OS certification requests that OS need to validate the
> CodeSigning extended key usage extension field for integrity
> verifiction of exectable code:
> 
>     https://www.niap-ccevs.org/MMO/PP/-442-/
>         FIA_X509_EXT.1.1
> 
> This patchset adds the logic for parsing the codeSigning EKU extension
> field in X.509. And checking the CodeSigning EKU when verifying
> signature of kernel module or kexec PE binary in PKCS#7.

Might be cutting hairs here but you don't really explain
why we want to support it. It's not a counter argument
to add the feature. It's a counter argument against adding
undocumented features.

BR, Jarkko