| From | Andy Lutomirski <> | Date | Mon, 20 Nov 2017 12:44:35 -0800 | Subject | Re: [PATCH 17/30] x86, kaiser: map debug IDT tables |
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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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