Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1755941AbbDUTjS (ORCPT <rfc822;w@1wt.eu>);
	Tue, 21 Apr 2015 15:39:18 -0400
Received: from cavan.codon.org.uk ([93.93.128.6]:34594 "EHLO
	cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1755560AbbDUTjR (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Tue, 21 Apr 2015 15:39:17 -0400
Date: Tue, 21 Apr 2015 20:38:53 +0100
From: Matthew Garrett <mjg59@srcf.ucam.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Tom Gundersen <teg@jklm.no>, Jiri Kosina <jkosina@suse.cz>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andy Lutomirski <luto@amacapital.net>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Arnd Bergmann <arnd@arndb.de>,
        One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Daniel Mack <daniel@zonque.org>,
        David Herrmann <dh.herrmann@gmail.com>,
        Djalal Harouni <tixxdz@opendz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1
Message-ID: <20150421193852.GA12633@srcf.ucam.org>
References: <20150415122555.74258d63@lxorguk.ukuu.org.uk>
 <20150415154551.GE6801@home.goodmis.org>
 <20150415163520.GA25105@kroah.com>
 <20150415130649.6f9ab20f@gandalf.local.home>
 <20150415173145.GA26146@kroah.com>
 <20150415225611.0c256ea6@lxorguk.ukuu.org.uk>
 <CALCETrWBvT7Vhwir+ntk7A31Ux2C_3CeuWFk7iQqA1fovh74yg@mail.gmail.com>
 <552F8F97.3040208@zonque.org>
 <CAG-2HqXrc+oBpq2GFWwFs-3CjnUW0NKetwttQ+5HkxBRCPMqfw@mail.gmail.com>
 <87mw21qvyx.fsf@x220.int.ebiederm.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <87mw21qvyx.fsf@x220.int.ebiederm.org>
User-Agent: Mutt/1.5.21 (2010-09-15)
X-SA-Exim-Connect-IP: <locally generated>
X-SA-Exim-Mail-From: mjg59@cavan.codon.org.uk
X-SA-Exim-Scanned: No (on cavan.codon.org.uk); SAEximRunCond expanded to false
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 1030
Lines: 21

On Tue, Apr 21, 2015 at 11:36:54AM -0500, Eric W. Biederman wrote:
> 
> HeHeHe.  You mean all I need to do to get around all of the logging servers is
> capture CAP_SYS_BOOT?  Say like just capture this crazy watchdog program
> that doesn't run as root so that it can only reboot the system? HeHeHe
> So I can just trigger a clean reboot wait for journald, auditd, and
> syslog all to shut down and then do evil things to the machine without
> having to worry about erasing forensic evidence?

CAP_SYS_BOOT gives you kexec, and kexec with init=/bin/sh lets you do 
anything. You added that in dc009d92435f99498cbc579ce76bf28e837e2c14 and 
now the horse is long gone. Don't give CAP_SYS_BOOT to anything you 
don't trust with full privileges.

-- 
Matthew Garrett | mjg59@srcf.ucam.org
--
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/