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A custom allocator without __GFP_COMP that copies to userspace has been found in vmw_execbuf_process[1], so this disables the page-span checker by placing it behind a CONFIG for future work where such things can be tracked down later. [1] https://bugzilla.redhat.com/show_bug.cgi?id=1373326 Reported-by: Vinson Lee <vlee@freedesktop.org> Fixes: f5509cc18daa ("mm: Hardened usercopy") Signed-off-by: Kees Cook <keescook@chromium.org> Change-Id: I4177c0fb943f14a5faf5c70f5e54bf782c316f43 (cherry picked from commit 8e1f74ea02cf4562404c48c6882214821552c13f) Signed-off-by: Sami Tolvanen <samitolvanen@google.com>