linux-kernel - Re: [PATCH 0/3] x86/pti: Call pti_init() after mark

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Message-ID: <alpine.DEB.2.21.1807102224250.1588@nanos.tec.linutronix.de>
Date:   Tue, 10 Jul 2018 22:25:44 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Joerg Roedel <joro@...tes.org>
cc:     Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org
Subject: Re: [PATCH 0/3] x86/pti: Call pti_init() after mark_readonly()

On Tue, 10 Jul 2018, Joerg Roedel wrote:

> Hey Thomas,
> 
> On Tue, Jul 03, 2018 at 01:52:23PM +0200, Joerg Roedel wrote:
> > Joerg Roedel (3):
> >   x86/pti: Move pti_init() code out of __init
> >   x86/mm/pti: Call pti_init() after mark_readonly()
> >   x86/pti: Call pti_clone_kernel_text() from pti_init()
> 
> Please ignore this patch-set. It turned out that some code in the kernel
> executes user-space even before /init is started. I just ran into a
> problem where request_module calls usermode-helper and then
> triple-faults when it tries to go to user-space and finds the
> user-pagetable still empty.
> 
> I need to look into another solution for this then.

Thanks for the clue. I was about to stare at it.

Thanks,

	tglx