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Date: Mon, 26 Jan 2009 21:58:53 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Christoph Hellwig <hch@lst.de>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
       Christoph Hellwig <hch@lst.de>, "H. Peter Anvin" <hpa@zytor.com>,
       linux-kernel@vger.kernel.org
Subject: Re: devpts multiple instances feedback
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> > That was also one of the reasons for the default 000 mode on the pts/ptmx
> > device node
> 
> So just make it 000 but always created it.

That still allows it to be subverted with some security rulesets -
remember root can open a 000 file by default.