Re: [PATCH 27/41] mm/mmap: prevent pagefault handler from racing with mmu_notifier registration

On Wed, Jan 18, 2023 at 4:51 AM Jann Horn wrote: > > On Mon, Jan 9, 2023 at 9:54 PM Suren Baghdasaryan wrote: > > Page fault handlers might need to fire MMU notifications while a new > > notifier is being registered. Modify mm_take_all_locks to write-lock all > > VMAs and prevent this race with

Re: [PATCH 27/41] mm/mmap: prevent pagefault handler from racing with mmu_notifier registration

On Mon, Jan 9, 2023 at 9:54 PM Suren Baghdasaryan wrote: > Page fault handlers might need to fire MMU notifications while a new > notifier is being registered. Modify mm_take_all_locks to write-lock all > VMAs and prevent this race with fault handlers that would hold VMA locks. > VMAs are locked

[PATCH 27/41] mm/mmap: prevent pagefault handler from racing with mmu_notifier registration

Page fault handlers might need to fire MMU notifications while a new notifier is being registered. Modify mm_take_all_locks to write-lock all VMAs and prevent this race with fault handlers that would hold VMA locks. VMAs are locked before i_mmap_rwsem and anon_vma to keep the same locking order as