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Date:   Thu, 2 Nov 2017 00:54:36 -0700
From:   Andy Lutomirski <>
To:     Andy Lutomirski <>
Cc:     Linus Torvalds <>,
        Dave Hansen <>,
        Linux Kernel Mailing List <>,
        linux-mm <>, Kees Cook <>,
        Hugh Dickins <>
Subject: Re: [PATCH 00/23] KAISER: unmap most of the kernel from userspace
 page tables

On Thu, Nov 2, 2017 at 12:32 AM, Andy Lutomirski <> wrote:
> On Wed, Nov 1, 2017 at 1:33 PM, Andy Lutomirski <> wrote:
>> On Wed, Nov 1, 2017 at 12:05 PM, Linus Torvalds
>> <> wrote:
>>> On Wed, Nov 1, 2017 at 11:46 AM, Dave Hansen
>>> <> wrote:
>>>> The vmalloc()'d stacks definitely need the page table walk.
>>> Ugh, yes. Nasty.
>>> Andy at some point mentioned a per-cpu initial stack trampoline thing
>>> for his exception patches, but I'm not sure he actually ever did that.
>>> Andy?
>> I'm going to push it to very shortly (like twenty minutes
>> maybe).  Then the 0day bot can chew on it.  With the proposed LDT
>> rework, we don't need to do any of dynamic mapping stuff, I think.
> FWIW, I pushed all but the actual stack switching part.  Something
> broke in the rebase and it doesn't boot right now :(

Okay, that was embarrassing.  The rebase error was, drumroll please, I
forgot one of the patches.  Sigh.

It's here:

The last few patches are terminally ugly.  I'll clean them up shortly
and email them out.  That being said, unless there's a showstopper
bug, this should be a fine base for Dave's development.

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