On Thu, Jun 18, 2020 at 08:43:04AM +0200, Christoph Hellwig wrote: > Hi all, > > Dexuan reported a W^X violation due to the fact that the hyper hypercall > page due switching it to be allocated using vmalloc_exec. The problem > is that PAGE_KERNEL_EXEC as used by vmalloc_exec actually sets writable > permissions in the pte. This series fixes the issue by switching to the > low-level __vmalloc_node_range interface that allows specifing more > detailed permissions instead. It then also open codes the other two > callers and removes the somewhat confusing vmalloc_exec interface.
Acked-by: Peter Zijlstra (Intel) <[email protected]> > Peter noted that the hyper hypercall page allocation also has another > long standing issue in that it shouldn't use the full vmalloc but just > the module space. This issue is so far theoretical as the allocation is > done early in the boot process. I plan to fix it with another bigger > series for 5.9. Thanks!
