On Fri, Sep 9, 2016 at 1:43 AM, Anisse Astier <[email protected]> wrote: > PAGE_POISONING_ZERO disables zeroing new pages on alloc, they are > poisoned (zeroed) as they become available. > In the hibernate use case, free pages will appear in the system without > being cleared, left there by the loading kernel. > > This patch will make sure free pages are cleared on resume when > PAGE_POISONING_ZERO is enabled. We free the pages just after resume > because we can't do it later: going through any device resume code might > allocate some memory and invalidate the free pages bitmap. > > Thus we don't need to disable hibernation when PAGE_POISONING_ZERO is > enabled. > > Signed-off-by: Anisse Astier <[email protected]> > Cc: Kirill A. Shutemov <[email protected]> > Cc: Laura Abbott <[email protected]> > Cc: Mel Gorman <[email protected]> > Cc: Rafael J. Wysocki <[email protected]>
Cool! Reviewed-by: Kees Cook <[email protected]> -Kees -- Kees Cook Nexus Security
