On Mon, 17 Apr 2023 15:53:13 -0400 Peter Xu <peterx@xxxxxxxxxx> wrote: > When we try to unshare a pinned page for a private hugetlb, uffd-wp bit can > get lost during unsharing. Fix it by carrying it over. > > This should be very rare, only if an unsharing happened on a private > hugetlb page with uffd-wp protected (e.g. in a child which shares the same > page with parent with UFFD_FEATURE_EVENT_FORK enabled). What are the user-visible consequences of the bug? > Cc: linux-stable <stable@xxxxxxxxxxxxxxx> When proposing a backport, it's better to present the patch as a standalone thing, against current -linus. I'll then queue it in mm-hotfixes and shall send it upstream during this -rc cycle. As presented, this patch won't go upstream until after 6.3 is released, and as it comes later in time, more backporting effort might be needed. I can rework things if this fix is reasonably urgent (the "user-visible consequences" info is the guide). If not urgent, we can leave things as they are.
