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SubjectRe: [PATCH 17/30] x86, kaiser: map debug IDT tables
On Fri, Nov 10, 2017 at 11:31 AM, Dave Hansen
<dave.hansen@linux.intel.com> wrote:
>
> From: Dave Hansen <dave.hansen@linux.intel.com>
>
> The IDT is another structure which the CPU references via a
> virtual address. It also obviously needs these to handle an
> interrupt in userspace, so these need to be mapped into the user
> copy of the page tables.

Why would the debug IDT ever be used in user mode? IIRC it's a total
turd related to avoiding crap nesting inside NMI. Or am I wrong?

If it *is* used in user mode, then we have a bug and it should be in
the IDT to avoid address leaks just like the normal IDT.

--Andy

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