diff --git a/usr.bin/w/w.c b/usr.bin/w/w.c
index b75f7f48de33..924ba11fe253 100644
--- a/usr.bin/w/w.c
+++ b/usr.bin/w/w.c
@@ -179,6 +179,13 @@ main(argc, argv)
 	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
 	_res.retry = 1;		/* only try once.. */
 
+	/*
+	 * Discard setgid privileges if not the running kernel so that bad
+	 * guys can't print interesting stuff from kernel memory.
+	 */
+	if (nlistf != NULL || memf != NULL)
+		setgid(getgid());
+
 	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
 		errx(1, "%s", errbuf);
 
diff --git a/usr.sbin/slstat/slstat.c b/usr.sbin/slstat/slstat.c
index 402c24840d17..eb7d3b7a99f8 100644
--- a/usr.sbin/slstat/slstat.c
+++ b/usr.sbin/slstat/slstat.c
@@ -22,7 +22,7 @@
  */
 
 #ifndef lint
-static char rcsid[] = "$Id: slstat.c,v 1.3 1994/11/19 13:57:21 jkh Exp $";
+static char rcsid[] = "$Id: slstat.c,v 1.4 1995/05/30 03:52:30 rgrimes Exp $";
 #endif
 
 #include <stdio.h>
@@ -132,6 +132,13 @@ main(argc, argv)
 			kflag++;
 		}
 	}
+	/*
+	 * Discard setgid privileges if not the running kernel so that bad
+	 * guys can't print interesting stuff from kernel memory.
+	 */
+	if (system != NULL || kmemf != NULL)
+	        setgid(getgid());
+
 	kvm_h = kvm_openfiles(system, kmemf, NULL, O_RDONLY, errbuf);
 	if (kvm_h == 0) {
 		(void)fprintf(stderr,