From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933684Ab3CTQqL (ORCPT ); Wed, 20 Mar 2013 12:46:11 -0400 Received: from terminus.zytor.com ([198.137.202.10]:48745 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933184Ab3CTQqJ (ORCPT ); Wed, 20 Mar 2013 12:46:09 -0400 Message-ID: <5149E7C3.3080707@zytor.com> Date: Wed, 20 Mar 2013 09:45:55 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 MIME-Version: 1.0 To: Matthew Garrett CC: "linux-kernel@vger.kernel.org" , "linux-security-module@vger.kernel.org" , "linux-efi@vger.kernel.org" , "kexec@lists.infradead.org" , "linux-pci@vger.kernel.org" Subject: Re: [PATCH 01/12] Security: Add CAP_COMPROMISE_KERNEL References: <1363642353-30749-1-git-send-email-matthew.garrett@nebula.com> <51490ABD.3050205@zytor.com> <1363785354.2553.15.camel@x230.sbx07502.somerma.wayport.net> <1363792462.2553.24.camel@x230.sbx07502.somerma.wayport.net> In-Reply-To: <1363792462.2553.24.camel@x230.sbx07502.somerma.wayport.net> X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/20/2013 08:14 AM, Matthew Garrett wrote: > On Wed, 2013-03-20 at 08:03 -0700, H. Peter Anvin wrote: >> CAP_SYS_RAWIO is definitely inappropriate there. > > Ok. How do we fix that without breaking userspace that expects > CAP_SYS_RAWIO to be sufficient? > I don't think we can to some way, because when what you have is fundamentally broken, it's hard to fix. However, it is extremely likely that the number of affected applications is vanishingly small. There probably are a handful of apps that do this, and I wouldn't be surprised if most of them simply run as root. -hpa