From owner-freebsd-security@FreeBSD.ORG Tue Oct 2 17:31:50 2012 Return-Path: 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 8DEAA106566B for ; Tue, 2 Oct 2012 17:31:50 +0000 (UTC) (envelope-from des@des.no) Received: from smtp.des.no (smtp.des.no [194.63.250.102]) by mx1.freebsd.org (Postfix) with ESMTP id 4D53D8FC1B for ; Tue, 2 Oct 2012 17:31:50 +0000 (UTC) Received: from ds4.des.no (smtp.des.no [194.63.250.102]) by smtp.des.no (Postfix) with ESMTP id 744BC6BE3; Tue, 2 Oct 2012 19:31:49 +0200 (CEST) Received: by ds4.des.no (Postfix, from userid 1001) id 39A1081BA; Tue, 2 Oct 2012 19:31:49 +0200 (CEST) From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= To: d@delphij.net References: <9DD86238-51C8-4F38-B7EB-BD773039888B@cederstrand.dk> <50697975.4070609@delphij.net> Date: Tue, 02 Oct 2012 19:31:48 +0200 In-Reply-To: <50697975.4070609@delphij.net> (Xin Li's message of "Mon, 01 Oct 2012 04:07:33 -0700") Message-ID: <86obkkixvf.fsf@ds4.des.no> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.4 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Cc: "freebsd-security@freebsd.org" , Erik Cederstrand Subject: Re: Opinion on checking return value of setuid(getuid())? X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Oct 2012 17:31:50 -0000 Xin Li writes: > How can the check be even reached in setuid(getuid()) case? It's also > conflict with intuition by the way -- we are not changing ownership of > the process, thus the process number should not change... See http://lxr.linux.no/linux+v3.6/kernel/sys.c#L646 DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no