linux-kernel - Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509 certs

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Date:   Thu, 4 Jan 2018 11:38:14 -0800
From:   Benjamin Gilbert <benjamin.gilbert@...eos.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        linux-mm@...ck.org, stable <stable@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Garnier <thgarnie@...gle.com>,
        Alexander Kuleshov <kuleshovmail@...il.com>
Subject: Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509
 certs

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