From owner-freebsd-hackers Sat Apr 13 12:41:24 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from vulcan.rsasecurity.com (vulcan.rsasecurity.com [204.167.114.130]) by hub.freebsd.org (Postfix) with SMTP id 241EA37B419 for ; Sat, 13 Apr 2002 12:41:18 -0700 (PDT) Received: from sdtihq24.securitydynamics.com by vulcan.rsasecurity.com via smtpd (for hub.FreeBSD.org [216.136.204.18]) with SMTP; 13 Apr 2002 19:40:11 UT Received: from ebola.securitydynamics.com (ebola.securid.com [192.80.211.4]) by sdtihq24.securid.com (Pro-8.9.3/Pro-8.9.3) with ESMTP id PAA15473 for ; Sat, 13 Apr 2002 15:40:01 -0400 (EDT) Received: from spirit.dynas.se (localhost [127.0.0.1]) by ebola.securitydynamics.com (8.10.2+Sun/8.9.1) with SMTP id g3DJfJ613653 for ; Sat, 13 Apr 2002 15:41:19 -0400 (EDT) Received: (qmail 25490 invoked from network); 13 Apr 2002 19:41:13 -0000 Received: from explorer.rsa.com (HELO mikko.rsa.com) (10.81.217.59) by spirit.st.se.eu.rsa.net with SMTP; 13 Apr 2002 19:41:13 -0000 Received: (from mikko@localhost) by mikko.rsa.com (8.11.6/8.11.6) id g3DJfAb18611; Sat, 13 Apr 2002 12:41:10 -0700 (PDT) (envelope-from mikko) Date: Sat, 13 Apr 2002 12:41:10 -0700 (PDT) From: Mikko Tyolajarvi Message-Id: <200204131941.g3DJfAb18611@mikko.rsa.com> To: simokawa@sat.t.u-tokyo.ac.jp Cc: hackers@freebsd.org Orig-To: Hidetoshi Shimokawa Subject: Re: FireWire for kernel hackers Newsgroups: local.freebsd.hackers References: Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG In local.freebsd.hackers you write: >Quoted from 00README in >http://people.freebsd.org/~simokawa/firewire-20020412.tar.gz > As you know, IEEE1394 is a bus and OHCI supports physical access > to the host memory. This means that you can access the remote > host over firewire without software support at the remote host. > In other words, you can investigate remote host's physical memory > whether its OS is alive or crashed or hangs up. Umm... excuse a stupid question, but does this mean that a firewire port always gives unconditional access to the host's memory? Great for kernel debugging. Maybe not so great for a running system, from a security point a view (ok, physical access eventually equals full access, but plugging in a firewire cable is a heck of a lot faster than using a screwdriver...) ? /Mikko -- Mikko Työläjärvi_______________________________________mikko@rsasecurity.com RSA Security To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message