Re: Misc Fixes
Alan Cox (alan@lxorguk.ukuu.org.uk)
Sun, 14 Jul 1996 23:05:50 +0100 (BST)
> > (and perhaps some other things) in a read-only page, and as modules
> > are running in ring 1, they can't write to it.
>
> Not all architectures implement such multiple security levels in
> hardware. You can't rely on it being available.
To all intents including the PC. If I can load a module to drive a lance
net card (or almost any DMA device) I can potentially use it to DMA stuff
into ring 0 space since the MMU on a PC doesnt include DMA accesses.
Alan