linux-kernel - Re: [PATCH 0/3 5.2-stable] Sync mappings in vmalloc/ioremap areas

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Message-ID: <20190814075751.GC9222@suse.de>
Date:   Wed, 14 Aug 2019 09:57:51 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Joerg Roedel <joro@...tes.org>, stable@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3 5.2-stable] Sync mappings in vmalloc/ioremap areas

Hi Greg,

On Tue, Aug 13, 2019 at 08:36:42PM +0200, Greg Kroah-Hartman wrote:
> On Tue, Aug 13, 2019 at 05:28:11PM +0200, Joerg Roedel wrote:
> > From: Joerg Roedel <jroedel@...e.de>
> > 
> > Backport commits from upstream to fix a data corruption
> > issue that gets exposed when using PTI on x86-32.
> > 
> > Please consider them for inclusion into stable-5.2.
> 
> Thanks for these.  Based on the Fixes: tags on the commits, I've taken
> them all the way back to 4.4.y.

Thank you! The problem almost only exposes itself when PTI on x86-32 is
enabled (which was merged in 4.19), so I only backported down to that
kernel.

But it is right that it might be possible to trigger the problem on
older kernels too, e.g. in some 32bit XEN-pv configurations that use
same PAE page-table structures as the PTI code for 32bit.

So thanks for picking the fixes up for the older kernels too.


Regards,

	Joerg