skip folders are these are not suid / guid

usr/lib/security-misc/permission-hardening

@@ -71,6 +71,12 @@ add_nosuid_statoverride_entry() {
       continue
     fi
 
+    if test -d "$file_name" ; then
+      ## https://forums.whonix.org/t/kernel-hardening/7296/323
+      true "skip folder: $file_name"
+      continue
+    fi
+
     setuid=""
     setuid_output=""
     if test -u "$file_name" ; then