diff --git a/kernel/ksud.c b/kernel/ksud.c
index 0c325a1a..e27c2763 100644
--- a/kernel/ksud.c
+++ b/kernel/ksud.c
@@ -632,6 +632,31 @@ static void do_stop_input_hook(struct work_struct *work)
  }
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0)
+#include "objsec.h" // task_security_struct
+bool is_ksu_transition(const struct task_security_struct *old_tsec,
+			const struct task_security_struct *new_tsec)
+{
+	static u32 ksu_sid;
+	char *secdata;
+	u32 seclen;
+	bool allowed = false;
+
+	if (!ksu_execveat_hook) // not needed anymore once ksud ran
+		return false;
+
+	if (!ksu_sid)
+		security_secctx_to_secid("u:r:su:s0", strlen("u:r:su:s0"), &ksu_sid);
+
+	if (security_secid_to_secctx(old_tsec->sid, &secdata, &seclen))
+		return false;
+
+	allowed = (!strcmp("u:r:init:s0", secdata) && new_tsec->sid == ksu_sid);
+	security_release_secctx(secdata, seclen);
+	return allowed;
+}
+#endif
+
 static void stop_vfs_read_hook()
 {
 #ifdef CONFIG_KSU_KPROBES_HOOK