After a userfaultfd unregister, make sure the range doesn't disable write in ptes. Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Signed-off-by: Shaohua Li <shli@xxxxxx> --- fs/userfaultfd.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 12176b5..c79a3fd 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -953,6 +953,9 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, if (vma->vm_start > start) start = vma->vm_start; vma_end = min(end, vma->vm_end); + if (userfaultfd_wp(vma)) + change_protection(vma, start, vma_end, + vm_get_page_prot(vma->vm_flags), 1, 0); new_flags = vma->vm_flags & ~(VM_UFFD_MISSING | VM_UFFD_WP); prev = vma_merge(mm, prev, start, vma_end, new_flags, -- 2.4.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>