From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754787Ab3KUTZQ (ORCPT ); Thu, 21 Nov 2013 14:25:16 -0500 Received: from mx1.redhat.com ([209.132.183.28]:47687 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751971Ab3KUTZO (ORCPT ); Thu, 21 Nov 2013 14:25:14 -0500 Date: Thu, 21 Nov 2013 14:24:47 -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: <20131121192447.GO16208@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> <20131121191305.GK16208@redhat.com> <20131121191907.GA26366@srcf.ucam.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131121191907.GA26366@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 07:19:07PM +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