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

[Joerg Roedel]

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@xxxxxxx>
> > 
> > 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