linux-kernel - Re: [GIT PULL] Load keys from signed PE binaries

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20130221203843.GD23427@redhat.com>
Date:	Thu, 21 Feb 2013 15:38:43 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Jones <pjones@...hat.com>,
	David Howells <dhowells@...hat.com>,
	Josh Boyer <jwboyer@...hat.com>,
	Kees Cook <keescook@...omium.org>, keyrings@...ux-nfs.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] Load keys from signed PE binaries

On Thu, Feb 21, 2013 at 08:32:54PM +0000, Matthew Garrett wrote:
> On Thu, Feb 21, 2013 at 03:31:19PM -0500, Vivek Goyal wrote:
> > On Thu, Feb 21, 2013 at 10:56:44AM -0800, Linus Torvalds wrote:
> > 
> > [..]
> > > So no. The PE file thing makes no sense what-so-ever. What you mention
> > > we can already do, and we already do it *better*.
> > 
> > IIUC, PE/COFF signature verification bits can be useful for verifying
> > the signature of PE/COFF signed bzImage. This verification will be
> > required before kexec decides to load the kernel.
> 
> Only if the kexec validation's being done in kernel. We'd need agreement 
> on that before it's a justification.

Even if /sbin/kexec does bzImage validation I think it will require
kernel's help. (This is assuming that only /sbin/kexec is signed and we
can't trust user space crypto libraries).

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/