From owner-freebsd-security@FreeBSD.ORG  Thu Jul 19 10:19:21 2007
Return-Path: <owner-freebsd-security@FreeBSD.ORG>
X-Original-To: freebsd-security@freebsd.org
Delivered-To: freebsd-security@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 2270016A400
	for <freebsd-security@freebsd.org>;
	Thu, 19 Jul 2007 10:19:21 +0000 (UTC) (envelope-from des@des.no)
Received: from tim.des.no (tim.des.no [194.63.250.121])
	by mx1.freebsd.org (Postfix) with ESMTP id D5D6613C494
	for <freebsd-security@freebsd.org>;
	Thu, 19 Jul 2007 10:19:20 +0000 (UTC) (envelope-from des@des.no)
Received: from tim.des.no (localhost [127.0.0.1])
	by spam.des.no (Postfix) with ESMTP id 867AA2091;
	Thu, 19 Jul 2007 12:02:17 +0200 (CEST)
X-Spam-Tests: AWL,DATE_IN_PAST_24_48
X-Spam-Learn: disabled
X-Spam-Score: 0.8/3.0
X-Spam-Checker-Version: SpamAssassin 3.2.1 (2007-05-02) on tim.des.no
Received: from dwp.des.no (des.no [80.203.243.180])
	by smtp.des.no (Postfix) with ESMTP id 0B98B2115;
	Thu, 19 Jul 2007 12:00:46 +0200 (CEST)
Received: by dwp.des.no (Postfix, from userid 1001)
	id 7BB345311; Tue, 17 Jul 2007 12:45:40 +0200 (CEST)
From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: Stef Walter <stef@memberwebs.com>
References: <20070717032204.09BA8D4F8E@mx.npubs.com>
Date: Tue, 17 Jul 2007 12:45:40 +0200
In-Reply-To: <20070717032204.09BA8D4F8E@mx.npubs.com> (Stef Walter's message
	of "Tue\, 17 Jul 2007 03\:22\:04 +0000 \(UTC\)")
Message-ID: <86lkdfb963.fsf@dwp.des.no>
User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.3 (berkeley-unix)
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Cc: freebsd-security@freebsd.org
Subject: Re: kern.chroot_allow_open_directories
X-BeenThere: freebsd-security@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "Security issues \[members-only posting\]"
	<freebsd-security.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>, 
	<mailto:freebsd-security-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-security>
List-Post: <mailto:freebsd-security@freebsd.org>
List-Help: <mailto:freebsd-security-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>, 
	<mailto:freebsd-security-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 19 Jul 2007 10:19:21 -0000

Stef Walter <stef@memberwebs.com> writes:
> The chroot(2) man page describes a sysctl called
> 'kern.chroot_allow_open_directories' which controls whether a process
> can chroot() and is already subject to the chroot() syscall.
>
> It seems that this sysctl can be trivially changed from within a
> chroot'd process (ie: if that process has superuser privileges).

That's what securelevels are for.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no