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

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Message-ID: <20201021101057.GA13854@linux-l9pv.suse>
Date:   Wed, 21 Oct 2020 18:10:57 +0800
From:   joeyli <jlee@...e.com>
To:     list.lkml.keyrings@...benboeckel.net
Cc:     "Lee, Chun-Yi" <joeyli.kernel@...il.com>,
        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
Subject: Re: [RFC PATCH 2/2] PKCS#7: Check codeSigning EKU for kernel module
 and kexec pe verification

Hi Ben,

On Tue, Oct 20, 2020 at 09:42:08AM -0400, Ben Boeckel wrote:
> 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?

Thanks for your review. I will remove the "now" in next version.

Joey Lee