Re: 4.4-rc5: ugly warn on: 5 W+X pages found

[Arjan van de Ven]

On 12/14/2015 11:56 PM, Pavel Machek wrote:
> On Mon 2015-12-14 13:24:08, Arjan van de Ven wrote:
> > > That's weird.  The only API to do that seems to be manually setting
> > > kmap_prot to _PAGE_KERNEL_EXEC, and nothing does that.  (Why is
> > > kmap_prot a variable on x86 at all?  It has exactly one writer, and
> > > that's the code that initializes it in the first place.  Shouldn't we
> > > #define kmap_prot _PAGE_KERNEL?
> >
> > iirc it changes based on runtime detection of NX capability
>
> Huh. Is it possible that core duo is so old that it has no NX?

really stupid question I guess, but is PAE on ?
(64 bit pagetables are required for NX)


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