Re: Linux Xen PV CPA W^X violation false-positives

[Jürgen Groß <jgross@xxxxxxxx>]

Hi Jason,

On 28.03.24 02:24, Jason Andryuk wrote:
> On Wed, Mar 27, 2024 at 7:46 AM Jürgen Groß <jgross@xxxxxxxx> wrote:
> > On 24.01.24 17:54, Jason Andryuk wrote:
> > > +
> > > +                     return new;
> > > +             }
> > > +     }
> > > +
> > >        end = start + npg * PAGE_SIZE - 1;
> > >        WARN_ONCE(1, "CPA detected W^X violation: %016llx -> %016llx range: 0x%016lx 
> > > - 0x%016lx PFN %lx\n",
> > >                  (unsigned long long)pgprot_val(old),
> > Jason, do you want to send a V2 with your Signed-off, or would you like me to
> > try upstreaming the patch?
> Hi Jürgen,
>
> Yes, please upstream your approach.  I wasn't sure how to deal with
> it, so it was more of a bug report.
The final solution was a bit more complicated, as there are some
corner cases to be considered. OTOH it is now complete by looking
at all used translation entries.

Are you able to test the attached patch? I don't see the original
issue and can only verify the patch doesn't cause any regression.


Juergen

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