linux-kernel - Re: [PATCH] x86/power: Fix some ordering bugs in __restore_processor

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Message-ID: <alpine.DEB.2.20.1711301700260.1925@nanos>
Date:   Thu, 30 Nov 2017 17:00:52 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...nel.org>
cc:     X86 ML <x86@...nel.org>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] x86/power: Fix some ordering bugs in
 __restore_processor_context()

On Thu, 30 Nov 2017, Andy Lutomirski wrote:

> On Thu, Nov 30, 2017 at 7:57 AM, Andy Lutomirski <luto@...nel.org> wrote:
> > __restore_processor_context() had a couple of ordering bugs.  It
> > restored GSBASE after calling load_gs_index(), and the latter can
> > call into tracing code.  It also tried to restore segment registers
> > before restoring the LDT, which is straight-up wrong.
> 
> Ingo, Thomas, if you apply this version, can you fix up the following
> changelog bug:
> 
> >                 .seg_not_present = 1,
> 
> That should be = 0 above.

Sure. I'll wait for Jarkko to confirm.

> If I send a v2, I'll fix it.
>