Messages in this thread | | | Date | Mon, 08 Apr 2013 15:47:18 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] x86: make IDT read-only |
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On 04/08/2013 03:43 PM, Kees Cook wrote: > This makes the IDT unconditionally read-only. This primarily removes > the IDT from being a target for arbitrary memory write attacks. It has > an added benefit of also not leaking (via the "sidt" instruction) the > kernel base offset, if it has been relocated. > > Signed-off-by: Kees Cook <keescook@chromium.org> > Cc: Eric Northup <digitaleric@google.com>
This isn't quite what this patch does, though, right? There is still a writable IDT mapping at all times, which is different from a true readonly IDT, no?
-hpa
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