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Date: Thu, 21 Nov 2013 14:24:47 -0500
From: Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [PATCH 4/6] kexec: A new system call, kexec_file_load, for in
 kernel kexec
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To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Greg KH <greg@kroah.com>, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Peter Jones <pjones@redhat.com>, ebiederm@xmission.com, hpa@zytor.com

On Thu, Nov 21, 2013 at 07:19:07PM +0000, Matthew Garrett wrote:
> On Thu, Nov 21, 2013 at 02:13:05PM -0500, Vivek Goyal wrote:
> > On Thu, Nov 21, 2013 at 07:06:20PM +0000, Matthew Garrett wrote:
> > > That would require a certain degree of massaging from userspace if we 
> > > want to be able to use the existing Authenticode signatures. Otherwise 
> > > we need to sign kernels twice.
> > 
> > I was thinking oof signing the same kernel twice. Can I sign authenticode
> > signed kernel again (using RSA signature as we do for modules) and append
> > the signature to bzImage. 
> 
> No, you'd need to do it the other way around.

Then I can't assume that RSA signatures are appened to bzImage, as we
do for modules.

Also I am assuming that authenticode signing will change something in
PE/COFF header and that would invalidate the bzImage signature.

Thanks
Vivek

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