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Date: Thu, 26 Aug 2004 18:13:03 +0200
From: Christoph Hellwig <hch@lst.de>
To: Jamie Lokier <jamie@shareable.org>
Cc: Christoph Hellwig <hch@lst.de>, Hans Reiser <reiser@namesys.com>,
       Alex Zarochentsev <zam@namesys.com>, linux-fsdevel@vger.kernel.org,
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       Alexander Lyamin aka FLX <flx@namesys.com>,
       Linus Torvalds <torvalds@osdl.org>,
       ReiserFS List <reiserfs-list@namesys.com>
Subject: Re: silent semantic changes with reiser4
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On Thu, Aug 26, 2004 at 05:06:38PM +0100, Jamie Lokier wrote:
> Christoph Hellwig wrote:
> > > There's bound to be some security issue, but I'm not sure what you're
> > > getting at with /tmp.  What sort of sort of security problem arises
> > > with a world-writeable directory such as /tmp, that cannot arise with
> > > the standard fs semantics?
> > 
> > Actually you are right on that issue because it would open the
> > device/fifo as directory and not device/fifo (in fact I'd had to look at
> > the code again to see whether they actually do this only for files or
> > also for special files)
> 
> Are you saying that with reiser4, you can open a device or fifo with
> O_DIRECTORY?

That's what I thought, but as far as I can follow the code this is not
actually true.