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Date: Sat, 10 Dec 2011 10:37:23 -0800
From: Arjan van de Ven <arjan@infradead.org>
To: Rusty Russell <rusty@ozlabs.org>
Cc: David Howells <dhowells@redhat.com>, keyrings@linux-nfs.org,
        linux-crypto@vger.kernel.org, linux-security-module@vger.kernel.org,
        linux-kernel@vger.kernel.org, dmitry.kasatkin@intel.com,
        zohar@linux.vnet.ibm.com, arjan@linux.intel.com, alan.cox@intel.com,
        Jon Masters <jcm@jonmasters.org>
Subject: Re: [PATCH 21/21] MODSIGN: Apply signature checking to modules on
 module load [ver #3]
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> 
> Yes, there may be more than stripped and unstripped.  You may need to
> do fancy things.  But now, adding a signature is so easy that it's
> not a real problem.  And we can always have a hook, like:
> 
>         if VARIANTS=`make-module-variants $MOD`; then
>                 for m in $VARIANTS; do sign $m >> $MOD; rm $m; done
>         fi

but that requires you to keep the key around.
the most simple and common deployment of this is to generate a key,
build the public key into the kernel, sign the modules as you build the
kernel, and then destroy the key.
And THEN it gets deployed.