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From: Dag-Erling Smørgrav <des@FreeBSD.org>
Date: Sun, 16 Sep 2012 15:22:15 +0000 (UTC)
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Subject: svn commit: r240563 - head/usr.sbin/jail
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Author: des
Date: Sun Sep 16 15:22:15 2012
New Revision: 240563
URL: http://svn.freebsd.org/changeset/base/240563

Log:
  Warn about filesystem-based attacks.

Modified:
  head/usr.sbin/jail/jail.8

Modified: head/usr.sbin/jail/jail.8
==============================================================================
--- head/usr.sbin/jail/jail.8	Sun Sep 16 14:38:01 2012	(r240562)
+++ head/usr.sbin/jail/jail.8	Sun Sep 16 15:22:15 2012	(r240563)
@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 23, 2012
+.Dd September 15, 2012
 .Dt JAIL 8
 .Os
 .Sh NAME
@@ -1225,3 +1225,11 @@ directory that is moved out of the jail'
 access to the file space outside of the jail.
 It is recommended that directories always be copied, rather than moved, out
 of a jail.
+.Pp
+In addition, there are several ways in which an unprivileged user
+outside the jail can cooperate with a privileged user inside the jail
+and thereby obtain elevated privileges in the host environment.
+Most of these attacks can be mitigated by ensuring that the jail root
+is not accessible to unprivileged users in the host environment.
+Regardless, as a general rule, untrusted users with privileged access
+to a jail should not be given access to the host environment.