linux-kernel - Re: [PATCH v2] fs: block cross-uid sticky symlinks

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Message-ID: <20100531192745.GR31073@ZenIV.linux.org.uk>
Date:	Mon, 31 May 2010 20:27:45 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Kees Cook <kees.cook@...onical.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Dave Young <hidave.darkstar@...il.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	James Morris <jmorris@...ei.org>,
	Eric Paris <eparis@...hat.com>,
	David Howells <dhowells@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Tim Gardner <tim.gardner@...onical.com>,
	"Serge E. Hallyn" <serue@...ibm.com>
Subject: Re: [PATCH v2] fs: block cross-uid sticky symlinks

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...
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