linux-kernel - Re: [RFC PATCH 2/2] PKCS#7: Check codeSigning EKU for kernel module and kexec pe verification

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Date:   Tue, 20 Oct 2020 09:42:08 -0400
From:   Ben Boeckel <me@...boeckel.net>
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>, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Lee, Chun-Yi" <jlee@...e.com>
Subject: Re: [RFC PATCH 2/2] PKCS#7: Check codeSigning EKU for kernel module
 and kexec pe verification

On Tue, Oct 20, 2020 at 14:50:01 +0800, Lee, Chun-Yi wrote:
> +config CHECK_CODESIGN_EKU
> +	bool "Check codeSigning extended key usage"
> +	depends on PKCS7_MESSAGE_PARSER=y
> +	depends on SYSTEM_DATA_VERIFICATION
> +	help
> +	  This option provides support for checking the codeSigning extended
> +	  key usage extension when verifying the signature in PKCS#7. It
> +	  affects kernel module verification and kexec PE binary verification
> +	  now.

Is the "now" necessary? Isn't it implied by the option's existence?

--Ben