Index: usr.sbin/jail/jail.c
===================================================================
--- usr.sbin/jail/jail.c	(revision 230401)
+++ usr.sbin/jail/jail.c	(working copy)
@@ -508,10 +508,13 @@ static void
 set_param(const char *name, char *value)
 {
 	struct jailparam *param;
+	char *rpath;
 	int i;
 
 	static int paramlistsize;
 
+	rpath = NULL;
+
 	/* Separate the name from the value, if not done already. */
 	if (name == NULL) {
 		name = value;
@@ -520,8 +523,15 @@ set_param(const char *name, char *value)
 	}
 
 	/* jail_set won't chdir along with its chroot, so do it here. */
-	if (!strcmp(name, "path") && chdir(value) < 0)
-		err(1, "chdir: %s", value);
+	if (!strcmp(name, "path")) {
+		/* resolve the path with realpath(3) */
+		if ((rpath = malloc(PATH_MAX)) == NULL)
+			errx(1, "malloc");
+		if (realpath(value, rpath) != NULL)
+			value = rpath;
+		if (chdir(value) < 0)
+			err(1, "chdir: %s", value);
+	}
 
 	/* Check for repeat parameters */
 	for (i = 0; i < nparams; i++)
@@ -552,8 +562,14 @@ set_param(const char *name, char *value)
 	param_values[nparams] = value;
 	param = params + nparams++;
 	if (jailparam_init(param, name) < 0 ||
-	    jailparam_import(param, value) < 0)
+	    jailparam_import(param, value) < 0) {
+		if (rpath != NULL)
+			free(rpath);
 		errx(1, "%s", jail_errmsg);
+	}
+
+	if (rpath != NULL)
+		free(rpath);
 }
 
 static void