Re: x86/mm: Found insecure W+X mapping at address (ptrval)/0xc00a0000
From: Borislav Petkov
Date: Thu Oct 04 2018 - 04:48:20 EST
On Thu, Oct 04, 2018 at 10:43:18AM +0200, Joerg Roedel wrote:
> Yeah, that's what I also found out back then, the region needs to be WX.
> So we can either leave with the warning, as we know it is harmless and
> where it comes from or implement an exception in the checking code for
> that region.
The second thing is what I'm thinking too.
Or, a 3rd: not direct-map that first range at all. Commenting out the
ISA range mapping didn't have any adverse effects on my system here, for
example. But then those other mappings appeared:
https://lkml.kernel.org/r/20181003212255.GB28361@xxxxxxx
for which I have no explanation yet how they came about.
This needs to be understood fully before we do anything. But it is
32-bit so it gets preempted by more important things all the time :)
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.