From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [PATCH v2] fs: block cross-uid sticky symlinks
Date: Mon, 31 May 2010 20:27:45 +0100
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Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org,
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	Ingo Molnar <mingo@elte.hu>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Tim Gardner <tim.gardner@canonical.com>,
	"Serge E. Hallyn" <serue@us.ibm.com>
To: Kees Cook <kees.cook@canonical.com>
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On Mon, May 31, 2010 at 10:50:08AM -0700, Kees Cook wrote:

> > Give your users their own /tmp. No kernel mods, no misbehaviours, no
> > weirdomatic path walking hackery. No kernel patch needed that I can see.
> 
> Some real applications expect to share /tmp (e.g. "screen").

/tmp/screen-exchange, you mean?  Such a brilliant idea on multiuser system...