Merge tag 'usercopy-v4.8-rc8' of git://git.kernel.org/pub/scm/linux/k…

…ernel/git/kees/linux

Pull usercopy hardening fix from Kees Cook:
 "Expand the arm64 vmalloc check to include skipping the module space
  too"

* tag 'usercopy-v4.8-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  mm: usercopy: Check for module addresses

mm/usercopy.c

@@ -207,8 +207,11 @@ static inline const char *check_heap_object(const void *ptr, unsigned long n,
 	 * Some architectures (arm64) return true for virt_addr_valid() on
 	 * vmalloced addresses. Work around this by checking for vmalloc
 	 * first.
+	 *
+	 * We also need to check for module addresses explicitly since we
+	 * may copy static data from modules to userspace
 	 */
-	if (is_vmalloc_addr(ptr))
+	if (is_vmalloc_or_module_addr(ptr))
 		return NULL;
 
 	if (!virt_addr_valid(ptr))