linux-kernel - Re: kdbus: credential faking

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Message-ID: <CANq1E4Sdpb81PW9Ju+bnRjtZ=9HkGwGse-gstx1SjaEzmWiT-w@mail.gmail.com>
Date:	Fri, 10 Jul 2015 18:26:33 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	Stephen Smalley <sds@...ho.nsa.gov>,
	Greg KH <gregkh@...uxfoundation.org>,
	Daniel Mack <daniel@...que.org>,
	Djalal Harouni <tixxdz@...ndz.org>,
	lkml <linux-kernel@...r.kernel.org>,
	LSM <linux-security-module@...r.kernel.org>,
	Paul Osmialowski <p.osmialowsk@...sung.com>,
	Paul Moore <paul@...l-moore.com>
Subject: Re: kdbus: credential faking

Hi

On Fri, Jul 10, 2015 at 5:59 PM, Casey Schaufler <casey@...aufler-ca.com> wrote:
[...]
>                There are so many ways uids are being (miss/ab)used
> on Linux systems these days that the idea of trusting a bus just
> because its non-root uid is listed in a table somewhere (or worse,
> coded in an API) is asking for exploits.

Please elaborate on these possible exploits. I'd also like to hear,
whether the same applies to the already used '/run/user/<uid>/bus',
which follows nearly the same model.

Thanks
David
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