X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fcore%2Fdbus-manager.c;h=7a06ca64929c0986c35ecbf265dc7a8930ad0497;hb=ec8927ca5940e809f0b72f530582c76f1db4f065;hp=6ad198436ad89af5b9074eafd8d595728ab2e0f4;hpb=1ebf0cb73dacaf12c095580d8223a83cc96e441d;p=elogind.git

diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c
index 6ad198436..7a06ca649 100644
--- a/src/core/dbus-manager.c
+++ b/src/core/dbus-manager.c
@@ -1186,6 +1186,7 @@ static DBusHandlerResult bus_manager_message_handler(DBusConnection *connection,
         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "SwitchRoot")) {
                 const char *switch_root, *switch_root_init;
                 char *u, *v;
+                int k;
 
                 if (!dbus_message_get_args(
                                     message,
@@ -1195,10 +1196,10 @@ static DBusHandlerResult bus_manager_message_handler(DBusConnection *connection,
                                     DBUS_TYPE_INVALID))
                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 
-                if (path_equal(switch_root, "/") || !is_path(switch_root))
+                if (path_equal(switch_root, "/") || !path_is_absolute(switch_root))
                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
 
-                if (!isempty(switch_root_init) && !is_path(switch_root_init))
+                if (!isempty(switch_root_init) && !path_is_absolute(switch_root_init))
                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
 
                 if (m->running_as != MANAGER_SYSTEM) {
@@ -1206,6 +1207,22 @@ static DBusHandlerResult bus_manager_message_handler(DBusConnection *connection,
                         return bus_send_error_reply(connection, message, &error, -ENOTSUP);
                 }
 
+                /* Safety check */
+                if (isempty(switch_root_init))
+                        k = access(switch_root, F_OK);
+                else {
+                        char *p;
+
+                        p = join(switch_root, "/", switch_root_init, NULL);
+                        if (!p)
+                                goto oom;
+
+                        k = access(p, X_OK);
+                        free(p);
+                }
+                if (k < 0)
+                        return bus_send_error_reply(connection, message, NULL, -errno);
+
                 u = strdup(switch_root);
                 if (!u)
                         goto oom;