Index: ping.c
===================================================================
RCS file: /cvs/src/sbin/ping/ping.c,v
retrieving revision 1.117
diff -u -p -r1.117 ping.c
--- ping.c	12 Mar 2015 09:54:11 -0000	1.117
+++ ping.c	13 Mar 2015 02:52:39 -0000
@@ -154,6 +154,8 @@ quad_t tsumsq = 0;		/* sum of all times 
 
 int bufspace = IP_MAXPACKET;
 
+struct tv64 tv64_offset;
+
 void fill(char *, char *);
 void catcher(int signo);
 void prtsig(int signo);
@@ -338,6 +340,8 @@ main(int argc, char *argv[])
 	if (argc != 1)
 		usage();
 
+	arc4random_buf(&tv64_offset, sizeof(tv64_offset));
+
 	memset(&interstr, 0, sizeof(interstr));
 
 	interstr.it_value.tv_sec = interval;
@@ -620,8 +624,10 @@ pinger(void)
 
 		if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1)
 			err(1, "clock_gettime(CLOCK_MONOTONIC)");
-		tv64.tv64_sec = htobe64(ts.tv_sec);
-		tv64.tv64_nsec = htobe64(ts.tv_nsec);
+		tv64.tv64_sec = htobe64((u_int64_t)ts.tv_sec ^
+		    tv64_offset.tv64_sec);
+		tv64.tv64_nsec = htobe64((u_int64_t)ts.tv_nsec ^
+		    tv64_offset.tv64_nsec);
 		memcpy(&outpack[8], &tv64, sizeof(tv64));
 	}
 
@@ -703,8 +709,10 @@ pr_pack(char *buf, int cc, struct sockad
 			timinginfo++;
 			pkttime = (char *)icp->icmp_data;
 			memcpy(&tv64, pkttime, sizeof(tv64));
-			tp.tv_sec = betoh64(tv64.tv64_sec);
-			tp.tv_nsec = betoh64(tv64.tv64_nsec);
+			tp.tv_sec = betoh64(tv64.tv64_sec) ^
+			    tv64_offset.tv64_sec;
+			tp.tv_nsec = betoh64(tv64.tv64_nsec) ^
+			    tv64_offset.tv64_nsec;
 
 			timespecsub(&ts, &tp, &ts);
 			triptime = (ts.tv_sec * 1000000) + (ts.tv_nsec / 1000);