linux-kernel - Re: [PATCH 02/23] x86, kaiser: do not set _PAGE_USER for init

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Date:   Thu, 2 Nov 2017 19:24:32 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...capital.net>
cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        moritz.lipp@...k.tugraz.at,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>,
        michael.schwarz@...k.tugraz.at, Kees Cook <keescook@...gle.com>,
        Hugh Dickins <hughd@...gle.com>, X86 ML <x86@...nel.org>
Subject: Re: [PATCH 02/23] x86, kaiser: do not set _PAGE_USER for init_mm
 page tables

On Thu, 2 Nov 2017, Andy Lutomirski wrote:

> > On Nov 2, 2017, at 5:38 PM, Dave Hansen <dave.hansen@...ux.intel.com> wrote:
> > 
> >> On 11/02/2017 04:33 AM, Thomas Gleixner wrote:
> >> So for the problem at hand, I'd suggest we disable the vsyscall stuff if
> >> CONFIG_KAISER=y and be done with it.
> > 
> > Just to be clear, are we suggesting to just disable
> > LEGACY_VSYSCALL_NATIVE if KAISER=y, and allow LEGACY_VSYSCALL_EMULATE?
> > Or, do we just force LEGACY_VSYSCALL_NONE=y?
> 
> We'd have to force NONE, and Linus won't like it.

The much I hate it, I already accepted grudgingly that we have to keep it
alive in some way or the other.

Thanks,

	tglx