Messages in this thread |  | | From | (Alan Cox) | Subject | Re: Misc Fixes | Date | Sun, 14 Jul 1996 23:05:50 +0100 (BST) |
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> > (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
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