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Date: Thu, 4 Jan 2018 11:38:14 -0800
From: Benjamin Gilbert <benjamin.gilbert@coreos.com>
Subject: Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509
 certs
Message-ID: <20180104193814.GA26859@trogon.sfo.coreos.systems>
References: <CAD3VwcrHs8W_kMXKyDjKnjNDkkK57-0qFS5ATJYCphJHU0V3ow@mail.gmail.com>
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 <20180104003303.GA1654@trogon.sfo.coreos.systems>
 <DE0BC12C-4BA8-46AF-BD90-6904B9F87187@amacapital.net>
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To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>, linux-mm@kvack.org, stable <stable@vger.kernel.org>, Ingo Molnar <mingo@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>, Peter Zijlstra <peterz@infradead.org>, Thomas Garnier <thgarnie@google.com>, Alexander Kuleshov <kuleshovmail@gmail.com>

On Thu, Jan 04, 2018 at 01:28:59PM +0100, Thomas Gleixner wrote:
> On Wed, 3 Jan 2018, Andy Lutomirski wrote:
> > Our memory map code is utter shite.  This kind of bug should not be
> > possible without a giant warning at boot that something is screwed up.
> 
> You're right it's utter shite and the KASLR folks who added this insanity
> of making vaddr_end depend on a gazillion of config options and not
> documenting it in mm.txt or elsewhere where it's obvious to find should
> really sit back and think hard about their half baken 'security' features.
> 
> Just look at the insanity of comment above the vaddr_end ifdef maze.
> 
> Benjamin, can you test the patch below please?

Seems to work!

Thanks,
--Benjamin Gilbert

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