From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263883AbTJFCOQ (ORCPT ); Sun, 5 Oct 2003 22:14:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263947AbTJFCOQ (ORCPT ); Sun, 5 Oct 2003 22:14:16 -0400 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:29122 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S263883AbTJFCOP (ORCPT ); Sun, 5 Oct 2003 22:14:15 -0400 Date: Mon, 6 Oct 2003 03:14:14 +0100 From: viro@parcelfarce.linux.theplanet.co.uk To: Erik Tews , Christian Kujau , linux-kernel Subject: Re: reiserfs one user DoS? Message-ID: <20031006021414.GL7665@parcelfarce.linux.theplanet.co.uk> References: <20031004120625.GA41175@colocall.net> <3F7EF082.3020702@namesys.com> <3F804234.9070606@g-house.de> <20031005235149.GA3993@debian.franken.de> <20031006020342.GH1205@matchmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20031006020342.GH1205@matchmail.com> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Oct 05, 2003 at 07:03:42PM -0700, Mike Fedyk wrote: > On Mon, Oct 06, 2003 at 01:51:49AM +0200, Erik Tews wrote: > > On Sun, Oct 05, 2003 at 06:09:24PM +0200, Christian Kujau wrote: > > > Hans Reiser schrieb: > > > >>I have found such strange thing: > > > >> > > > >>pseudo@avalon at 14:04:00 ~> dd if=/dev/zero of=file bs=1 count=0 > > > >>seek=1000000000000 > > > >> > > > >>After that my Intel Celeron 800 MHz/384M RAM 60G/Seagate U6 under > > > >>Linux-2.4.22-grsec on reiserfs was utilized 100% for more than 2 hours. > > > >>dd process can't be killed. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > Really? If I got a process which is unkillable, how can the kernel kill > > this process if it runs out of cpu-time? > > If it is unkillable, you're either talking about kernel bugs or NFS, and > root should be able to kill a user process that has run out of ulimit > resources.