From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759807AbXFOXaj (ORCPT ); Fri, 15 Jun 2007 19:30:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757803AbXFOXad (ORCPT ); Fri, 15 Jun 2007 19:30:33 -0400 Received: from iriserv.iradimed.com ([72.242.190.170]:54707 "EHLO iradimed.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757493AbXFOXac (ORCPT ); Fri, 15 Jun 2007 19:30:32 -0400 Message-ID: <4673212B.5010304@cfl.rr.com> Date: Fri, 15 Jun 2007 19:30:51 -0400 From: Phillip Susi User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: Jan Engelhardt CC: "R.F. Burns" , Lee Revell , linux-kernel@vger.kernel.org Subject: Re: PC speaker References: <75b66ecd0706120744g7cdb3392l6537b5c68c2d6b21@mail.gmail.com> <4672C76D.5050008@cfl.rr.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 15 Jun 2007 23:30:49.0319 (UTC) FILETIME=[34C5C770:01C7AFA5] X-TM-AS-Product-Ver: SMEX-7.2.0.1122-3.6.1039-15240.001 X-TM-AS-Result: No--4.143400-5.000000-31 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jan Engelhardt wrote: > On Jun 15 2007 13:07, Phillip Susi wrote: >> R.F. Burns wrote: >>> However, over the past several weeks, the students have found more >>> creative ways to abuse the PC speaker (outside of the OS.) The Powers >>> that Be are asking that the PC speakers be disabled completely. With >>> the small number of techs we have, it would be very impractical to go >>> around to all systems and remove the PC speaker from each and every >>> computer case. >> Now I am curious; how are they getting the pc speaker to make any sound with >> the kernel module disabled? > > ioperm(), inb(), and outb() from userspace. Needs root, though. Or > /dev/port, with write. Which comes to the question how they gained root. > Perhaps live cd? In which case, the OP should, as recommended in this > thread already, deactivate choosing boot devices, if that's possible. > > (Unfortunately, newer BIOSes with 'integrated bootmenu' with F8 or so, > but I have not seen a way to deactivate _that_ menu.) He already said they don't have root access and that allowed him to stop them from accessing the sound card by setting appropriate permissions.