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Backporting commit 19be0eaffa [mm: remove gup_flags FOLL_WRITE games from __get_user_pages()] to address the dirtycow exploit. (From OE-Core rev: 8470ea4cfd5fca4c9573e39c7c3486aeb310990a) Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>