Messages in this thread | | | Date | Sat, 17 Aug 2002 20:26:56 +0200 | From | Gabriel Paubert <> | Subject | Re: Boot failure in 2.5.31 BK with new TLS patch |
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James Bottomley wrote:
> > > Actually, the intel manual recommends (but doesn't require) a wierd alignment > for the descriptors. It recommends aligning them at an address which is 2 MOD > 4 to avoid possible alignment check faults in user mode. Not that I think we > can ever run into the problem, but we should probably obey the recommendation. > I'll fix this up as well.
This is already done for the IDT descriptor, but not (yet) for the gdt descriptor(s).
Alignment checks are only done when CPL==3. And lidt/lgdt are (obviously) privileged, although sidt/sgdt (and sldt/str for that matter) are not, but I can't see how application could take benefit or make malicious use of this capability.
Gabriel.
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