Index: head/etc/mtree/BSD.var.dist
===================================================================
--- head/etc/mtree/BSD.var.dist
+++ head/etc/mtree/BSD.var.dist
@@ -74,6 +74,8 @@
     preserve
     ..
     run
+        dhclient
+        ..
         ppp             gname=network mode=0770
         ..
         wpa_supplicant
Index: head/sbin/dhclient/dhclient.8
===================================================================
--- head/sbin/dhclient/dhclient.8
+++ head/sbin/dhclient/dhclient.8
@@ -38,7 +38,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 13, 2011
+.Dd August 4, 2018
 .Dt DHCLIENT 8
 .Os
 .Sh NAME
@@ -87,7 +87,7 @@
 .It Fl p Ar file
 Specify an alternate location for the PID file.
 The default is
-.Pa /var/run/dhclient. Ns Ar interface Ns Pa .pid .
+.Pa /var/run/dhclient/dhclient. Ns Ar interface Ns Pa .pid .
 .It Fl q
 Forces
 .Nm
@@ -194,3 +194,16 @@
 .Pp
 The current implementation was reworked by
 .An Henning Brauer Aq Mt henning@openbsd.org .
+.Sh BUGS
+The
+.Nm
+utility uses
+.Xr capsicum 4
+to sandbox the main process.
+If the requisite kernel support is not available, the main process will
+attempt to run in a
+.Xr chroot 2
+sandbox instead.
+This will fail if the process is jailed or the
+.Va kern.chroot_allow_open_directories
+sysctl is set to 0.
Index: head/sbin/dhclient/dhclient.c
===================================================================
--- head/sbin/dhclient/dhclient.c
+++ head/sbin/dhclient/dhclient.c
@@ -371,6 +371,7 @@
 int
 main(int argc, char *argv[])
 {
+	u_int			 capmode;
 	int			 ch, fd, quiet = 0, i = 0;
 	int			 pipe_fd[2];
 	int			 immediate_daemon = 0;
@@ -419,7 +420,7 @@
 
 	if (path_dhclient_pidfile == NULL) {
 		asprintf(&path_dhclient_pidfile,
-		    "%sdhclient.%s.pid", _PATH_VARRUN, *argv);
+		    "%s/dhclient/dhclient.%s.pid", _PATH_VARRUN, *argv);
 		if (path_dhclient_pidfile == NULL)
 			error("asprintf");
 	}
@@ -528,11 +529,6 @@
 	if (cap_rights_limit(routefd, &rights) < 0 && errno != ENOSYS)
 		error("can't limit route socket: %m");
 
-	if (chroot(_PATH_VAREMPTY) == -1)
-		error("chroot");
-	if (chdir("/") == -1)
-		error("chdir(\"/\")");
-
 	if (setgroups(1, &pw->pw_gid) ||
 	    setegid(pw->pw_gid) || setgid(pw->pw_gid) ||
 	    seteuid(pw->pw_uid) || setuid(pw->pw_uid))
@@ -545,6 +541,19 @@
 	if (caph_enter_casper() < 0)
 		error("can't enter capability mode: %m");
 
+	/*
+	 * If we are not in capability mode (i.e., because Capsicum or
+	 * libcasper is disabled), try to restrict filesystem access.  This
+	 * will fail if kern.chroot_allow_open_directories is 0 or the process
+	 * is jailed.
+	 */
+	if (cap_getmode(&capmode) < 0 || capmode == 0) {
+		if (chroot(_PATH_VAREMPTY) == -1)
+			error("chroot");
+		if (chdir("/") == -1)
+			error("chdir(\"/\")");
+	}
+
 	if (immediate_daemon)
 		go_daemon();
 
@@ -2449,13 +2458,8 @@
 
 	cap_rights_init(&rights);
 
-	if (pidfile != NULL) {
+	if (pidfile != NULL)
 		pidfile_write(pidfile);
-		if (cap_rights_limit(pidfile_fileno(pidfile), &rights) < 0 &&
-		    errno != ENOSYS) {
-			error("can't limit pidfile descriptor: %m");
-		}
-	}
 
 	if (nullfd != -1) {
 		close(nullfd);
Index: head/sbin/init/rc.d/dhclient
===================================================================
--- head/sbin/init/rc.d/dhclient
+++ head/sbin/init/rc.d/dhclient
@@ -14,7 +14,7 @@
 name="dhclient"
 desc="Dynamic Host Configuration Protocol (DHCP) client"
 rcvar=
-pidfile="/var/run/${name}.${ifn}.pid"
+pidfile="/var/run/dhclient/${name}.${ifn}.pid"
 start_precmd="dhclient_prestart"
 stop_precmd="dhclient_pre_check"