linux-kernel - Re: Crashes with KPTI and -rc6

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Date:   Thu, 4 Jan 2018 07:57:24 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Laura Abbott <labbott@...hat.com>
Cc:     X86 ML <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Crashes with KPTI and -rc6


* Laura Abbott <labbott@...hat.com> wrote:

> Hi,
> 
> Fedora got a report via IRC of a double fault with KPTI
> https://paste.fedoraproject.org/paste/SL~of04ZExXP6AN2gcJi7A

I believe this one should be fixed by:

  d7732ba55c4b: x86/pti: Switch to kernel CR3 at early in entry_SYSCALL_compat()

> This is on -rc6 . I saw the one fix posted already which
> I'll pull in but I wanted to report this as a heads up
> in case there are other issues.
> 
> Full tree and configs are at
> https://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git/log/?h=rawhide

Thanks!

Linus's latest upstream:

  00a5ae218d57: Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

and later kernels includes all fixes for all regressions that were reported so far 
on top of -rc6:

 2fd9c41aea47: x86/process: Define cpu_tss_rw in same section as declaration
 d7732ba55c4b: x86/pti: Switch to kernel CR3 at early in entry_SYSCALL_compat()
 3ffdeb1a02be: x86/dumpstack: Print registers for first stack frame
 a9cdbe72c4e8: x86/dumpstack: Fix partial register dumps
 52994c256df3: x86/pti: Make sure the user/kernel PTEs match
 694d99d40972: x86/cpu, x86/pti: Do not enable PTI on AMD processors
 87faa0d9b43b: x86/pti: Enable PTI by default

PTI fixes can also be independently tracked and pre-merged via:

  git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti

Thanks,

	Ingo