linux-kernel - Re: kdbus: to merge or not to merge?

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Date:	Thu, 06 Aug 2015 10:25:18 +0200
From:	Martin Steigerwald <martin@...htvoll.de>
To:	David Herrmann <dh.herrmann@...il.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Havoc Pennington <havoc.pennington@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tom Gundersen <teg@...m.no>, Daniel Mack <daniel@...que.org>,
	"Kalle A. Sandstrom" <ksandstr@....fi>,
	Borislav Petkov <bp@...en8.de>, cee1 <fykcee1@...il.com>
Subject: Re: kdbus: to merge or not to merge?

Am Donnerstag, 6. August 2015, 10:04:57 schrieb David Herrmann:
> >          Given that all existing prototype userspace that I'm aware of
> >
> > (systemd and its consumers) apparently opts in, I don't really care
> > that the feature is opt-in.
> 
> This is just plain wrong. Out of the dozens of dbus applications, you
> found like 9 which are buggy? Two of them are already fixed, the
> maintainers of the other ones notified.
> I'd be interested where you got this notion that "all existing
> prototype userspace [...] opts in".

But these few can create the issues Andy described?

Sure, one can argue I can setup a stress or stress-ng command line invocation 
as root user that will basically grind a Linux system to a halt – and in a way 
I consider this to be a bug in the kernel as well, but one that exists since a 
long time. But a GUI application running as a user?

How about some robustness regarding what you see as bugs in userspace here?

I think "The bug is not mine" is exactly the same language we have seen here 
before. If the kernel relies on bug-free userspace applications in order to do 
its job properly I think it has robustness issues. One certainly wouldn´t want 
this with any mission critical realtime OS. I think it is the kernel that 
should be in control.

Thanks,
-- 
Martin
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