Re: [PATCH v3] x86/power/64: Fix kernel text mapping corruption during image restoration

[Rafael J. Wysocki]

On Wednesday, June 29, 2016 07:52:18 PM Logan Gunthorpe wrote:
> Hey Raf,
> 
> Sorry to report that although the patch works the majority of the time, 
> I just got a suspicious kernel panic during resume.
> 
> It said:
> 
> "kernel tried to execute NX protected page - exploit attempt? (uid: 0)"
> 
> You can find a photo of the panic here:
> 
> http://staff.deltatee.com/~logang/panic.jpg

Thanks for the report!

That's not what Boris was seeing at least.

It looks like clearing the NX bit for relocated_restore_code in
relocate_restore_code() didn't work for some reason.

I don't see why it may not work ATM, I need to have a fresh look at that
tomorrow.

I had hoped to be able to fix this bug for 4.7, but it looks like it will
miss the mark after all.  Oh well.

Thanks,
Rafael