linux-kernel - Re: kdbus: credential faking

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Message-ID: <CAFLxGvxxDvobrtWm4YiDwMtX7A5EH7crtyE+gi5UNmZqkJ6YZQ@mail.gmail.com>
Date:	Fri, 10 Jul 2015 20:02:00 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	David Herrmann <dh.herrmann@...il.com>,
	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

On Fri, Jul 10, 2015 at 7:16 PM, Casey Schaufler <casey@...aufler-ca.com> wrote:
> On 7/10/2015 9:26 AM, David Herrmann wrote:
>> 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.
>
> Sorry, I'm not the exploit generator guy. If I where, I would
> point out that the application expecting the uid to identify
> a person is going to behave incorrectly on the system that uses
> the uid to identify an application. I never said that I liked
> /run/user/<uid>/bus. Come to think of it, I never said I like
> dbus, either.

What did you mean by uids are being abused or misused?

-- 
Thanks,
//richard
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