Date: Mon, 8 May 2017 15:53:20 +0200 From: Daniel Gruss <daniel.gruss@...k.tugraz.at> To: David Gens <david.gens@...tu-darmstadt.de>, Thomas Garnier <thgarnie@...gle.com> CC: kernel list <linux-kernel@...r.kernel.org>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, <clementine.maurice@...k.tugraz.at>, <moritz.lipp@...k.tugraz.at>, Michael Schwarz <michael.schwarz@...k.tugraz.at>, Richard Fellner <richard.fellner@...dent.tugraz.at>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Ingo Molnar <mingo@...nel.org>, <anders.fogh@...ta-adan.de> Subject: Re: [RFC, PATCH] x86_64: KAISER - do not map kernel in user mode On 06.05.2017 10:38, Daniel Gruss wrote: > On 2017-05-06 06:02, David Gens wrote: >> Assuming that their patch indeed leaks per-cpu addresses.. it might not >> necessarily >> be required to change it. > > I think we're not leaking them (unless we still have some bug in our code). Just to correct my answer here as well: Although we experimented with fixed mappings for per-cpu addresses, the current patch does not incorporate this yet, so it indeed still leaks. However, it is not a severe problem. The mapping of the required (per-cpu) variables would be at a fixed location in the user CR3, instead of the ones that are used in the kernel.
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