On Thu, Jan 18, 2018 at 01:42:17PM -0800, David Rientjes wrote: > From: Hannes Reinecke <hare@xxxxxxx> > > commit 745dfa0d8ec26b24f3304459ff6e9eacc5c8351b upstream. > > The ioctl SET_FORCE_LOW_DMA has never worked since the initial git > check-in, and the respective setting is nowadays handled correctly. So > disable it entirely. > > [rientjes@xxxxxxxxxx: the SG_SET_FORCE_LOW_DMA ioctl can race with > mmap(MAP_POPULATE) or a VM_LOCKED vma to cause a use-after-free which > can result in a GPF in practice.] Thanks, I had already queued this up for 4.9, 4.4, and 3.18 last night, sorry you were not cc:ed on that. greg k-h