Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753003AbZLaSlV (ORCPT ); Thu, 31 Dec 2009 13:41:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752756AbZLaSlS (ORCPT ); Thu, 31 Dec 2009 13:41:18 -0500 Received: from out02.mta.xmission.com ([166.70.13.232]:38784 "EHLO out02.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752355AbZLaSlR (ORCPT ); Thu, 31 Dec 2009 13:41:17 -0500 To: "Andrew G. Morgan" Cc: "Serge E. Hallyn" , Alan Cox , Bryan Donlan , Benny Amorsen , Michael Stone , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-security-module@vger.kernel.org, Andi Kleen , David Lang , Oliver Hartkopp , Herbert Xu , Valdis Kletnieks , Evgeniy Polyakov , "C. Scott Ananian" , James Morris , Bernie Innocenti , Mark Seaborn , Randy Dunlap , =?utf-8?Q?Am=C3=A9rico?= Wang , Tetsuo Handa , Samir Bellabes , Casey Schaufler , Pavel Machek , Al Viro Subject: Re: [RFC][PATCH v3] Unprivileged: Disable raising of privileges References: <551280e50912300652r1007dee0j8de750bf33af9b3c@mail.gmail.com> <20091230201712.GA23999@us.ibm.com> <20091230212931.233003b9@lxorguk.ukuu.org.uk> <20091230230042.5d2e78ac@lxorguk.ukuu.org.uk> <3e8340490912301844p4fddaf57ke58ceeba9582e0fa@mail.gmail.com> <20091231173334.5e3d7557@lxorguk.ukuu.org.uk> <20091231175257.GA7210@us.ibm.com> <551280e50912311020x2bdc5b1o699a601f67b91662@mail.gmail.com> From: ebiederm@xmission.com (Eric W. Biederman) Date: Thu, 31 Dec 2009 10:41:08 -0800 In-Reply-To: <551280e50912311020x2bdc5b1o699a601f67b91662@mail.gmail.com> (Andrew G. Morgan's message of "Thu\, 31 Dec 2009 10\:20\:18 -0800") Message-ID: User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-XM-SPF: eid=;;;mid=;;;hst=in02.mta.xmission.com;;;ip=76.21.114.89;;;frm=ebiederm@xmission.com;;;spf=neutral X-SA-Exim-Connect-IP: 76.21.114.89 X-SA-Exim-Mail-From: ebiederm@xmission.com X-SA-Exim-Scanned: No (on in02.mta.xmission.com); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 949 Lines: 24 "Andrew G. Morgan" writes: > Since there is already independent support for disabling file > capabilities (the privilege escalation part), I see these two > mechanisms as separable. I guess there is something that resembles support for disabling privilege escalation. The problem is that it requires privilege to use it. I have no problem with expressing this in a fine grained manner internally to the kernel but the user space interface needs to be atomic so that we can enable this all without privilege. Further I may be off but I think the implementation would be more challenging than what I have already posted. That doesn't mean it won't be more useful long term. Eric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/