Messages in this thread | | | Date | Mon, 28 Apr 2014 20:47:31 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] x86-64: espfix for 64-bit mode *PROTOTYPE* |
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On 04/28/2014 08:45 PM, H. Peter Anvin wrote: > > OK, so I found a bug in ldttest.c -- it sets CS to an LDT segment, but > it never sets SS to an LDT segment. This means that it should really > have zero footprint versus the espfix code, and implies that we instead > have another bug involved. Why the espfix code should have any effect > whatsoever is a mystery, however... if it indeed does? > > I have uploaded a fixed ldttest.c, but it seems we might be chasing more > than that... >
In particular, I was already wondered how we avoid an "upside down swapgs" with a #GP on IRET. The answer might be that we don't...
-hpa
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