linux-kernel - Re: [PATCH 00/12] Add kdbus implementation

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Message-ID: <20141030144709.GA19721@kroah.com>
Date:	Thu, 30 Oct 2014 07:47:09 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Karol Lewandowski <k.lewandowsk@...sung.com>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Linux API <linux-api@...r.kernel.org>,
	linux-kernel@...r.kernel.org, John Stultz <john.stultz@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Tejun Heo <tj@...nel.org>,
	Ryan Lortie <desrt@...rt.ca>,
	Simon McVittie <simon.mcvittie@...labora.co.uk>,
	daniel@...que.org, David Herrmann <dh.herrmann@...il.com>,
	Paul Moore <pmoore@...hat.com>,
	"casey.schaufler@...el.com" <casey.schaufler@...el.com>,
	marcel@...tmann.org, tixxdz@...ndz.org,
	javier.martinez@...labora.co.uk, alban.crequy@...labora.co.uk
Subject: Re: [PATCH 00/12] Add kdbus implementation

On Thu, Oct 30, 2014 at 11:44:39AM +0100, Karol Lewandowski wrote:
> [ Sorry for breaking thread and resend - gmane rejected my original message
>   due to too long list of recipients... ]
> 
> On 2014-10-30 00:40, Greg Kroah-Hartman wrote:
> 
> > There is a 1815 line documentation file in this series, so we aren't
> > trying to not provide this type of information here at all.  But yes,
> > more background, about why this can't be done in userspace (zero copy,
> > less context switches, proper credential passing, timestamping, availble
> > at early-boot, LSM hooks for security models to tie into
> 
> While you're at it... I did some work on proof-of-concept LSM patches for
> kdbus some time ago, see [1][2].  Currently, these are completely of date.
> 
>  [1] https://github.com/lmctl/linux/commits/kdbus-lsm-v4.for-systemd-v212
>  [2] https://github.com/lmctl/kdbus/commit/aa0885489d19be92fa41c6f0a71df28763228a40
> 
> May I ask if you guys have your own plan for LSM or maybe it would be
> worth to resurrect [1]?

The core calls are already mediated by LSM today, right?  We don't want
anyone to be parsing the data stream through an LSM, that idea got
rejected a long time ago as something that is really not a good idea.

Other than that, I don't know exactly what your patches do, or why they
are needed, care to go into details?

thanks,

greg k-h
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