linux-kernel - Re: kexec_load(2) bypasses signature verification

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Date:	Thu, 25 Jun 2015 11:59:20 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Dave Young <dyoung@...hat.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Josh Boyer <jwboyer@...oraproject.org>,
	"Theodore Ts'o" <tytso@....edu>, Petr Tesarik <ptesarik@...e.cz>,
	kexec <kexec@...ts.infradead.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: kexec_load(2) bypasses signature verification

On Thu, Jun 25, 2015 at 04:48:18PM +0800, Dave Young wrote:
> On 06/19/15 at 09:09am, Vivek Goyal wrote:
> > On Fri, Jun 19, 2015 at 04:18:16PM +0800, Dave Young wrote:
> > > > > If we want to disable unsigned kernel loading at compile time, then we
> > > > > really need to work on decoupling CONFIG_KEXEC and CONFIG_FILE_KEXEC.
> > > > > Introducing another config option is not the way forward, IMHO.
> > > > 
> > > > Yes, let's do it in this way since everyone is fine with it.
> > > 
> > > I will work on a patch if nobody else have interest or no time on it.
> > 
> > Thanks Dave. Will be good if you can get this done.
> 
> Vivek, I worked out some draft patches here:
> https://github.com/daveyoung/linux/commits/kexec-syscall-cleanup
> 
> Basiclly I split kexec_file first, then add CONFIG_KEXEC_CORE kconfig option
> then split kexec_load code from general code.
> 
> There's a lot of #ifdef CONFIG_KEXEC in kernel source, because CONFIG_KEXEC
> can be disabled so I changed all kernel general and x86 #ifdef to use
> CONFIG_KEXEC_CORE if necessary. For other arches dependent code with #ifdef
> I did not change anything other than the new Kconfig option. It will works
> because only x86 support KEXEC_FILE.
> 
> Please take a look if you have time, if this is not what you want please let
> me know.
> 
> I will have no time this week, only did building test, will do more test next
> week, if everything is ok I can send out the patches to list for review.

Hi Dave,

I have put few comments in github. Please have a look. Once you have
another version of patches, I will have another look.

Thanks
Vivek
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