linux-kernel - proc filesystem lets you out of a chroot?

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Message-ID: <4EBAD761.4060501@cfl.rr.com>
Date:	Wed, 09 Nov 2011 14:41:21 -0500
From:	Phillip Susi <psusi@....rr.com>
To:	linux-kernel@...r.kernel.org
Subject: proc filesystem lets you out of a chroot?

I thought that symlinks could not be followed out of a chroot, but if 
you follow /proc/1/root, you can escape from your chroot.  When open() 
finds that /proc/1/root is a symlink and restarts the name lookup with 
"/", shouldn't that start with the calling process's root and not init's?
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