Print a warning message if the files with the random seed are not

writeable during shutdown.  This prevents ugly error messages when
the machine is rebooted from singe-user without mounting the file
systems read-write.
suggested by deraadt@

diff --git a/etc/rc b/etc/rc
index 418c360..55cb691 100644 (file)
--- a/etc/rc
+++ b/etc/rc
@@ -1,4 +1,4 @@
-#      $OpenBSD: rc,v 1.436 2014/07/18 18:17:28 deraadt Exp $
+#      $OpenBSD: rc,v 1.437 2014/07/19 21:27:16 bluhm Exp $
 
 # System startup script run by init on autoboot
 # or after single-user.
@@ -267,7 +267,12 @@ FUNCS_ONLY=1 . /etc/rc.d/rc.subr
 _rc_parse_conf
 
 if [ X"$1" = X"shutdown" ]; then
-       random_seed
+       if echo 2>/dev/null >>/var/db/host.random || \
+           echo 2>/dev/null >>/etc/random.seed; then
+               random_seed
+       else
+               echo warning: cannot write random seed to disk
+       fi
 
        # If we are in secure level 0, assume single user mode.
        if [ `sysctl -n kern.securelevel` -ne 0 ]; then