linux-kernel - Re: Issues with capability bits and meta-data in kdbus

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Message-ID: <CANq1E4QafuvVU3i2GSah20Am1xvRTvuWRNo73ukwV-2MELj02g@mail.gmail.com>
Date:	Wed, 22 Apr 2015 15:46:57 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tom Gundersen <teg@...m.no>, Jiri Kosina <jkosina@...e.cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Daniel Mack <daniel@...que.org>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: Issues with capability bits and meta-data in kdbus

Hi

On Wed, Apr 22, 2015 at 5:19 AM, Andy Lutomirski <luto@...capital.net> wrote:
> Where do you draw the line?

User-space draws _this_ line.

A bus creator can set the "mandatory metadata mask" of a bus. It
defines a mask all senders (!) have to use as base. The bus creator
can thus mandate a policy for its bus and force everyone who wants to
communicate via this bus to at least agree to transmit the requested
set of information. Using UIDs+GIDs+PIDs+seclabel+names as masks works
just fine.

To be clear, kdbus only transmits metadata that sender and receiver
both agreed on. Both peers have to opt-in for an item to be
transmitted.

Thanks
David
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