--- rtc.c~	2006-02-14 02:31:51.000000000 +0100
+++ rtc.c	2006-02-14 02:32:48.000000000 +0100
@@ -478,6 +478,9 @@
 		unsigned char hrs, min, sec;
 		struct rtc_time alm_tm;

+		if (!capable(CAP_SYS_TIME))
+			return -EACCES;
+
 		if (copy_from_user(&alm_tm, (struct rtc_time __user *)arg,
 				   sizeof(struct rtc_time)))
 			return -EFAULT;