Re: [PATCH 1/1] userfaultfd: check VM_MAYWRITE was set after verifying the uffd is registered

2018-12-06 Thread Peter Xu
On Thu, Dec 06, 2018 at 04:20:28PM -0500, Andrea Arcangeli wrote: > Calling UFFDIO_UNREGISTER on virtual ranges not yet registered in uffd > could trigger an harmless false positive WARN_ON. Check the vma is > already registered before checking VM_MAYWRITE to shut off the > false positive warning.

Re: [PATCH 1/1] userfaultfd: check VM_MAYWRITE was set after verifying the uffd is registered

2018-12-06 Thread Hugh Dickins
On Thu, 6 Dec 2018, Andrea Arcangeli wrote: > Calling UFFDIO_UNREGISTER on virtual ranges not yet registered in uffd > could trigger an harmless false positive WARN_ON. Check the vma is > already registered before checking VM_MAYWRITE to shut off the > false positive warning. > > Cc: > Fixes: 29

Re: [PATCH 1/1] userfaultfd: check VM_MAYWRITE was set after verifying the uffd is registered

2018-12-06 Thread Mike Rapoport
On Thu, Dec 06, 2018 at 04:20:28PM -0500, Andrea Arcangeli wrote: > Calling UFFDIO_UNREGISTER on virtual ranges not yet registered in uffd > could trigger an harmless false positive WARN_ON. Check the vma is > already registered before checking VM_MAYWRITE to shut off the > false positive warning.

[PATCH 1/1] userfaultfd: check VM_MAYWRITE was set after verifying the uffd is registered

2018-12-06 Thread Andrea Arcangeli
Calling UFFDIO_UNREGISTER on virtual ranges not yet registered in uffd could trigger an harmless false positive WARN_ON. Check the vma is already registered before checking VM_MAYWRITE to shut off the false positive warning. Cc: Fixes: 29ec90660d68 ("userfaultfd: shmem/hugetlbfs: only allow to re