On Sat, 07 Jun 2025 02:40:00 -0400 Tal Zussman <tz2294@xxxxxxxxxxxx> wrote: > vma_can_userfault() masks off non-userfaultfd VM flags from vm_flags. > The vm_flags & VM_DROPPABLE test will then always be false, incorrectly > allowing VM_DROPPABLE regions to be registered with userfaultfd. > > Additionally, vm_flags is not guaranteed to correspond to the actual > VMA's flags. Fix this test by checking the VMA's flags directly. Wondering if we should backport this. afaict we don't know the userspace impact of this because nobody has tried it!
