Date: Fri, 23 Jul 2004 12:14:07 -0700 From: Julian Elischer <julian@elischer.org> To: Maxim Sobolev <sobomax@portaone.com> Cc: Andrew Gallatin <gallatin@cs.duke.edu> Subject: Re: Excellent job on the firewire support! Message-ID: <4101637F.5020906@elischer.org> In-Reply-To: <41012639.3020102@portaone.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> <41012639.3020102@portaone.com>
next in thread | previous in thread | raw e-mail | index | archive | help
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"
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4101637F.5020906>