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

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Message-Id: <DADF7172-F2ED-4C2A-B921-8707DEDEABD7@amacapital.net>
Date:   Thu, 2 Nov 2017 19:19:49 +0100
From:   Andy Lutomirski <luto@...capital.net>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        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 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.