diff --git a/[refs] b/[refs]
index 9f25c498c46e..895db24d3121 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a9e7acfff0a279792918b7b0de74106e576e9988
+refs/heads/master: 6e6823d17b157f185be09f4c70181299f9273f0b
diff --git a/trunk/kernel/time/posix-clock.c b/trunk/kernel/time/posix-clock.c
index 04498cbf6002..25028dd4fa18 100644
--- a/trunk/kernel/time/posix-clock.c
+++ b/trunk/kernel/time/posix-clock.c
@@ -287,11 +287,16 @@ static int pc_clock_adjtime(clockid_t id, struct timex *tx)
 	if (err)
 		return err;
 
+	if ((cd.fp->f_mode & FMODE_WRITE) == 0) {
+		err = -EACCES;
+		goto out;
+	}
+
 	if (cd.clk->ops.clock_adjtime)
 		err = cd.clk->ops.clock_adjtime(cd.clk, tx);
 	else
 		err = -EOPNOTSUPP;
-
+out:
 	put_clock_desc(&cd);
 
 	return err;
@@ -344,11 +349,16 @@ static int pc_clock_settime(clockid_t id, const struct timespec *ts)
 	if (err)
 		return err;
 
+	if ((cd.fp->f_mode & FMODE_WRITE) == 0) {
+		err = -EACCES;
+		goto out;
+	}
+
 	if (cd.clk->ops.clock_settime)
 		err = cd.clk->ops.clock_settime(cd.clk, ts);
 	else
 		err = -EOPNOTSUPP;
-
+out:
 	put_clock_desc(&cd);
 
 	return err;