On Thu, Jun 30, 2016 at 06:11:41PM +0200, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <[email protected]> > > Logan Gunthorpe reports that hibernation stopped working reliably for > him after commit ab76f7b4ab23 (x86/mm: Set NX on gap between __ex_table > and rodata). > > That turns out to be a consequence of a long-standing issue with the > 64-bit image restoration code on x86, which is that the temporary > page tables set up by it to avoid page tables corruption when the > last bits of the image kernel's memory contents are copied into > their original page frames re-use the boot kernel's text mapping, > but that mapping may very well get corrupted just like any other > part of the page tables. Of course, if that happens, the final > jump to the image kernel's entry point will go to nowhere.
... > Boris, please test it on the machine where we saw memory corruption with > the previous versions if poss. Looks good. 5 runs passed without a hiccup. Reported-and-tested-by: Borislav Petkov <[email protected]> -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply.
