On Tue, Oct 02, 2012 at 02:50:09PM -0700, H. Peter Anvin wrote: > That sounds like exactly the opposite of normal /dev/mem behavior... we > allow access to non-memory resources (which really could do anything if > misused), but not memory. >From arch/x86/mm/init.c: * On x86, access has to be given to the first megabyte of ram because that area * contains bios code and data regions used by X and dosemu and similar apps. Limiting this to just RAM would be safer than it currently is. I'm not convinced that there's any good reason to allow *any* access down there for EFI systems, though. -- Matthew Garrett | mjg59@xxxxxxxxxxxxx -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>