From owner-freebsd-security@FreeBSD.ORG Thu Dec 29 18:44:02 2011 Return-Path: Delivered-To: freebsd-security@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 585FC1065677; Thu, 29 Dec 2011 18:44:02 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from anubis.delphij.net (anubis.delphij.net [IPv6:2001:470:1:117::25]) by mx1.freebsd.org (Postfix) with ESMTP id 392FF8FC20; Thu, 29 Dec 2011 18:44:02 +0000 (UTC) Received: from delta.delphij.net (drawbridge.ixsystems.com [206.40.55.65]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by anubis.delphij.net (Postfix) with ESMTPSA id 024A817B17; Thu, 29 Dec 2011 10:44:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=delphij.net; s=anubis; t=1325184242; bh=rtUa7vZAwoQERoUHPQavvlx6X+IIxnXm2hJqifjPa+c=; h=Message-ID:Date:From:Reply-To:MIME-Version:To:CC:Subject: References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=OR0JdnSmiBgwiYaoctMkRiXu+HLbhrtrHCDbnbf43vUbwep/tGoxOqAKPtBTOsx+1 +0V71dAUECMmZlDZXy4EkM47VK5KzIGNLa0P0zShy/7caIxVbBGedbXb3kzYHLXIxc X1OSLxI5i8AIofCiO7vd0zzoCg+gaY8QcUr4POrA= Message-ID: <4EFCB4F1.2050500@delphij.net> Date: Thu, 29 Dec 2011 10:44:01 -0800 From: Xin Li Organization: The FreeBSD Project MIME-Version: 1.0 To: John Baldwin References: <201112231500.pBNF0c0O071712@svn.freebsd.org> <201112290939.53665.jhb@freebsd.org> <4EFCB0C9.6090608@delphij.net> <201112291343.02248.jhb@freebsd.org> In-Reply-To: <201112291343.02248.jhb@freebsd.org> X-Enigmail-Version: undefined Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: freebsd-security@freebsd.org, Doug Barton , d@delphij.net Subject: Re: svn commit: r228843 - head/contrib/telnet/libtelnet head/crypto/heimdal/appl/telnet/libtelnet head/include head/lib/libc/gen head/lib/libc/iconv head/lib/libc/include head/lib/libc/net head/libexec... X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: d@delphij.net List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Dec 2011 18:44:02 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 12/29/11 10:43, John Baldwin wrote: > On Thursday, December 29, 2011 1:26:17 pm Xin Li wrote: >> On 12/29/11 06:39, John Baldwin wrote: >>> Can you give some more details on why ftpd is triggering a >>> dlopen inside of the chroot? It would appear that that is >>> unrelated to helper programs (since setting a flag in libc in >>> ftpd can't possibly affect helper programs ability to use >>> dlopen() from within libc). >> >> Sure. That's because nsdispatch(3) would reload >> /etc/nsswitch.conf if it notices a change. After chroot() the >> file is considered as "chang"ed and thus it reloads the file as >> well as designated shared libraries. > > But ftpd has to be doing some operation that invokes an nss lookup > after entering the chroot for that to trigger, correct? Oh ok, that was the built-in ls(1). Cheers, - -- Xin LI https://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk78tPEACgkQOfuToMruuMBq7QCfe2mWQDanxhZDDODYCo4Wqets +VMAn3kfObewKpZReZIucOIQIuj+OnWS =8h/i -----END PGP SIGNATURE-----