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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