Re: [PATCH v2 2/3] userfaultfd: UFFDIO_REMAP uABI

Peter Xu
2023-09-28T16:29:48Z

On Wed, Sep 27, 2023 at 11:25:22AM -0700, Suren Baghdasaryan wrote:
> For uffd_remap can_change_pte_writable() would fail it VM_WRITE is not
> set, but we want remapping to work for RO memory as well.

Is there an use case that we want remap to work on RO?

The thing is, either removing a page or installing a new one with valid
content imply VM_WRITE to me on either side..

Thanks,

--
Peter Xu