Date: Thu, 22 Jul 2004 06:53:09 +0900 From: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp> To: Doug Rabson <dfr@nlsystems.com> Cc: Andrew Gallatin <gallatin@cs.duke.edu> Subject: Re: Excellent job on the firewire support! Message-ID: <87u0w1ni2i.wl@tora.nunu.org> In-Reply-To: <1090421941.7114.26.camel@builder02.qubesoft.com> References: <16634.47272.768935.436137@grasshopper.cs.duke.edu> <200407182039.10773.dfr@nlsystems.com> <16634.54674.966908.540880@grasshopper.cs.duke.edu> <200407182104.53221.dfr@nlsystems.com> <16638.32914.509773.486468@grasshopper.cs.duke.edu> <1090421941.7114.26.camel@builder02.qubesoft.com>
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At Wed, 21 Jul 2004 15:59:01 +0100, Doug Rabson wrote: > > If no, assuming I had a Windows or Linux box on the firewire bus, would it be > > possible to access physical memory from a different OS? > > Windows XP has some kind of firewire debug driver that you might have to > load (I haven't read the docs on that). I don't think the linux driver > enables physical access by default but it would be easy to hack it in > (just write all ones to the right fwohci register). The physical access is usually used for SBP-2 initiator mode. Without physical access, the performance of SBP-2 should be poorer and we see more load on CPU. The physical access can be restricted by two way. You can restrict it per node-id and by physical memory range(upper bound). As far as I have tried, WindowsXP seems not to allow physical access of usual nodes. But I think you can easily cheat it by a node with sbp target mode(use sbp_targ(4) ;-). In my opinion, it's hard to ensure security with current OHCI specification. https://www.netsecurity.ne.jp/article/2/6202.html This page describes this problem in Japanese. It says that information source is "iDEFENSE Intelligence Operations, June 18, 2002" but I cannot find the original source (in English). /\ Hidetoshi Shimokawa \/ simokawa@sat.t.u-tokyo.ac.jp PGP public key: http://www.sat.t.u-tokyo.ac.jp/~simokawa/pgp.html
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