Re: [RFC, PATCH] x86_64: KAISER - do not map kernel in user mode

From: Christoph Hellwig
Date: Thu May 04 2017 - 11:48:00 EST

On Thu, May 04, 2017 at 12:02:47PM +0200, Daniel Gruss wrote:
> After several recent works [1,2,3] KASLR on x86_64 was basically considered
> dead by many researchers. We have been working on an efficient but effective
> fix for this problem and found that not mapping the kernel space when
> running in user mode is the solution to this problem [4] (the corresponding
> paper [5] will be presented at ESSoS17).

I'll try to read the paper. In the meantime: how different is your
approach from then one here?

and how different is the performance impact?