On Thu, 22 Feb 2024 16:08:15 +0800 Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx> wrote: > After ptep_clear_flush(), if we find that src_folio is pinned we will fail > UFFDIO_MOVE and put src_folio back to src_pte entry, but the change to > src_folio->{mapping,index} is not restored in this process. This is not > what we expected, so fix it. > > Fixes: adef440691ba ("userfaultfd: UFFDIO_MOVE uABI") What are the expected worst-case userspace-visible runtime effects of this flaw?