Re: On the correctness of dbe3ed1c078c193be34326728d494c5c4bc115e2

[Linus Torvalds]

On Sun, Sep 1, 2013 at 5:20 AM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>
> This has the end result that we treat a user space instruction which
> touches a privileged data structure that then page faults (e.g. a
> segment load which causes #PF on the GDT) as a user-space fault.
>
> This seems very wrong to me, since such a #PF would indicate a serious
> error in the kernel.

Not necessarily. Don't we basically do exactly that for the F00F bug
workaround, for example?

                Linus
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