linux-kernel - Re: [PATCH 4/6] kexec: A new system call, kexec_file

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20131121192447.GO16208@redhat.com>
Date:	Thu, 21 Nov 2013 14:24:47 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org,
	kexec@...ts.infradead.org, ebiederm@...ssion.com, hpa@...or.com,
	Peter Jones <pjones@...hat.com>
Subject: Re: [PATCH 4/6] kexec: A new system call, kexec_file_load, for in
 kernel kexec

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/