From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755147Ab3KUTNf (ORCPT ); Thu, 21 Nov 2013 14:13:35 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54425 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754011Ab3KUTNc (ORCPT ); Thu, 21 Nov 2013 14:13:32 -0500 Date: Thu, 21 Nov 2013 14:13:05 -0500 From: Vivek Goyal To: Matthew Garrett Cc: Greg KH , linux-kernel@vger.kernel.org, kexec@lists.infradead.org, ebiederm@xmission.com, hpa@zytor.com, Peter Jones Subject: Re: [PATCH 4/6] kexec: A new system call, kexec_file_load, for in kernel kexec Message-ID: <20131121191305.GK16208@redhat.com> References: <1384969851-7251-1-git-send-email-vgoyal@redhat.com> <1384969851-7251-5-git-send-email-vgoyal@redhat.com> <20131121190350.GC17070@kroah.com> <20131121190620.GA25951@srcf.ucam.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131121190620.GA25951@srcf.ucam.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 21, 2013 at 07:06:20PM +0000, Matthew Garrett wrote: > On Thu, Nov 21, 2013 at 11:03:50AM -0800, Greg KH wrote: > > > This could be done as we do with modules, and just tack the signature > > onto the end of the 'blob' of the image. That way we could use the same > > tool to sign the binary as we do for modules, and save the need for > > extra parameters in the syscall. > > 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. I am wondering if authenticode signature verification will fail due to this extra signature at the end of bzImage. pjones thought that it will break authenticode signature verification. CCing him. Thanks Vivek