Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755295AbbB0UPl (ORCPT ); Fri, 27 Feb 2015 15:15:41 -0500 Received: from mail-la0-f52.google.com ([209.85.215.52]:41644 "EHLO mail-la0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755226AbbB0UPh (ORCPT ); Fri, 27 Feb 2015 15:15:37 -0500 MIME-Version: 1.0 In-Reply-To: <20150226122707.GA27733@Nokia-N900> References: <20150202171257.GD24351@ubuntumail> <20150225215014.GD29527@amd> <20150226122707.GA27733@Nokia-N900> From: Andy Lutomirski Date: Fri, 27 Feb 2015 12:15:15 -0800 Message-ID: Subject: Re: [capabilities] Allow normal inheritance for a configurable set of capabilities To: Pavel Machek Cc: Christoph Lameter , Serge Hallyn , Serge Hallyn , Jonathan Corbet , Aaron Jones , "Ted Ts'o" , LSM List , "linux-kernel@vger.kernel.org" , Andrew Morton , "Andrew G. Morgan" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1391 Lines: 40 On Thu, Feb 26, 2015 at 4:27 AM, Pavel Machek wrote: > On Wed 2015-02-25 17:59:04, Christoph Lameter wrote: >> On Wed, 25 Feb 2015, Pavel Machek wrote: >> >> > One solution is to put capabilities into the elf executable. I believe >> > there was patch for that. That means you don't need to add capability >> > support into filesystems... >> >> Ummm... So I can just get any caps by modifying the ELF header? >> Looking at the docs No, it just drops caps so binaries must be >> setsuid. > > exactly. Normal apps are not currently allowed to receive > capabilities, because they may not be ready for them. > > So add an elf note marking what capabilities it can deal with. > No need for setuid if caller has the capabilities already. We'd need extremely broad coverage for this to be useful because of shells, pipelines, scripts, etc. We'd need bash, env, python, etc. --Andy > > Pavel > > -- > (english) http://www.livejournal.com/~pavelmachek > (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- Andy Lutomirski AMA Capital Management, LLC -- 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/