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

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Message-ID: <20180710131959.GG13903@8bytes.org>
Date:   Tue, 10 Jul 2018 15:19:59 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>
Cc:     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()

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,

	Joerg