From owner-freebsd-current@FreeBSD.ORG Fri Jul 23 19:14:08 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3BE8016A4CE; Fri, 23 Jul 2004 19:14:08 +0000 (GMT) Received: from mail.vicor-nb.com (bigwoop.vicor-nb.com [208.206.78.2]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2CAF443D45; Fri, 23 Jul 2004 19:14:08 +0000 (GMT) (envelope-from julian@elischer.org) Received: from elischer.org (julian.vicor-nb.com [208.206.78.97]) by mail.vicor-nb.com (Postfix) with ESMTP id 0B8DC7A44F; Fri, 23 Jul 2004 12:14:08 -0700 (PDT) Message-ID: <4101637F.5020906@elischer.org> Date: Fri, 23 Jul 2004 12:14:07 -0700 From: Julian Elischer User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.3.1) Gecko/20030516 X-Accept-Language: en, hu MIME-Version: 1.0 To: Maxim Sobolev 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> <41012639.3020102@portaone.com> In-Reply-To: <41012639.3020102@portaone.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: simokawa@freebsd.org cc: freebsd-current@freebsd.org cc: Andrew Gallatin Subject: Re: Excellent job on the firewire support! X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Jul 2004 19:14:08 -0000 How about setting it up to read the screen buffer during boot.. Maxim Sobolev wrote: > Doug Rabson wrote: > >> On Wed, 2004-07-21 at 15:41, Andrew Gallatin wrote: >> >>> Doug Rabson writes: >>> > Actually thats the only downside of dcons. It doesn't cut in until >>> the > firewire controller attaches. It relies on the fact that the >>> fwohci > driver allows access to physical memory from any node on >>> the bus > (implemeted in hardware so you can examine the memory of a >>> hung > machine). The dconschat program uses this feature to access >>> the dcons > ring buffers in the target machine. >>> >>> Does remote access to physical memory require dcons to be loaded >>> on the target? >> >> >> >> No. The remote access to physical memory is a hardware-implemented >> feature of the firewire ohci hardware. Its enabled in fwohci_attach(). >> In the long term, I would like to restrict this a bit but right now all >> you have to have is fwohci loaded on the target machine. > > > It would be nice to have some sysctl which to disable such access, > since it is BAD THING[tm] from the security POV. > > -Maxim > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to > "freebsd-current-unsubscribe@freebsd.org"