[PATCH v2 0/3] userfaultfd: verify VMA state across UFFDIO_COPY retry

[Mike Rapoport]

From: "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>

... and two more small fixes.

This applies on top of the current mm-unstable with
"userfaultfd: snapshot VMA state across UFFDIO_COPY retry"
reverted.

v2 changes:
* rename vma_snapshot to mfill_retry_state and related functions,
  variables and constants 
* drop redundant check for effective ops
* drop vma_uffd_copy_ops()
* restore large comment about MAP_PRIVATE handling and massage other
  comments
* new patches:
  - guard against bugs that could end up with NULL ops in
    __mfill_atomic_pte()
  - remove redundant check in vm_uffd_ops()

v1: https://lore.kernel.org/all/20260519052516.3315196-1-rppt@xxxxxxxxxx

Mike Rapoport (Microsoft) (3):
  userfaultfd: verify VMA state across UFFDIO_COPY retry
  userfaultfd: refuse to __mfill_atomic_pte() for unsupported VMAs
  userfaultfd: remove redundant check in vm_uffd_ops()

 mm/userfaultfd.c | 92 +++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 79 insertions(+), 13 deletions(-)

-- 
2.53.0