On Wed, Nov 1, 2017 at 2:28 PM, Thomas Gleixner <t...@linutronix.de> wrote: > On Wed, 1 Nov 2017, Andy Lutomirski wrote: > >> On Wed, Nov 1, 2017 at 2:11 PM, Thomas Gleixner <t...@linutronix.de> wrote: >> > On Tue, 31 Oct 2017, Dave Hansen wrote: >> > >> >> >> >> init_mm is for kernel-exclusive use. If someone is allocating page >> >> tables in it, do not set _PAGE_USER on them. This ensures that >> >> we do *not* set NX on these page tables in the KAISER code. >> > >> > This changelog is confusing at best. >> > >> > Why is this a kaiser issue? Nothing should ever create _PAGE_USER entries >> > in init_mm, right? >> >> The vsyscall page is _PAGE_USER and lives in init_mm via the fixmap. > > Groan, forgot about that abomination, but still there is no point in having > it marked PAGE_USER in the init_mm at all, kaiser or not. >
How can it be PAGE_USER in user mms but not init_mm? It's the same page table. > Thanks, > > tglx
