On 12/15/2017 05:10 PM, Linus Torvalds wrote: > Because *if* we want to check protection keys, I think we should do > that at the vma layer, partly exactly because the exact implementation > of protection keys is so architecture-specific, and partly because I > don't think it makes sense to check them for every page anyway. So, there are VMA checks against protection keys. The problem _here_ is that we are checking against the VMA (and correctly skipping the PKRU checks) and then _mistakenly_ applying the PTE checks against PKRU. I think the reason we needed VMA and PTE checks was the get_user_pages_fast() path not having a VMA. I need to go re-read the commits, though. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
