When "activating" systemd, handle its special case better

When dbus-daemon receives a request to activate a systemd service before
systemd has connected to it, it enqueues a fake request to "activate"
systemd itself (as a way to get a BusPendingActivationEntry to track the
process of waiting for systemd). When systemd later joins the bus,
dbus-daemon sends the actual activation message; any future activation
messages are sent directly to systemd.

In the "pending" code path, the activation messages are currently
dispatched as though they had been sent by the same process that sent
the original activation request, which is wrong: the bus security
policy probably doesn't allow that process to talk to systemd directly.
They should be dispatched as though they had been sent by the
dbus-daemon itself (connection == NULL), the same as in the non-pending
code path.

In the worst case, if the attempt to activate systemd timed out, the
dbus-daemon would crash with a (fatal) warning, because in this special
case, activation_message is a signal with no serial number, whereas the
code to send an error reply is expecting a method call with a serial
number.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=50199
Signed-off-by: Chengwei Yang <chengwei.yang@intel.com>
Tested-by: Ma Yu <yu.ma@intel.com>
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>

1 files changed, 14 insertions, 5 deletions

diff --git a/bus/activation.c b/bus/activation.c
index 3dfba787..fcb71337 100644
--- a/bus/activation.c
+++ b/bus/activation.c
@@ -80,7 +80,14 @@ typedef struct BusPendingActivationEntry BusPendingActivationEntry;
 
 struct BusPendingActivationEntry
 {
+  /* Normally a method call, but if connection is NULL, this is a signal
+   * instead.
+   */
   DBusMessage *activation_message;
+  /* NULL if this activation entry is for the dbus-daemon itself,
+   * waiting for systemd to start. In this case, auto_activation is always
+   * TRUE.
+   */
   DBusConnection *connection;
 
   dbus_bool_t auto_activation;
@@ -1106,7 +1113,8 @@ bus_activation_service_created (BusActivation  *activation,
       BusPendingActivationEntry *entry = link->data;
       DBusList *next = _dbus_list_get_next_link (&pending_activation->entries, link);
 
-      if (dbus_connection_get_is_connected (entry->connection))
+      /* entry->connection is NULL for activating systemd */
+      if (entry->connection && dbus_connection_get_is_connected (entry->connection))
         {
           /* Only send activation replies to regular activation requests. */
           if (!entry->auto_activation)
@@ -1175,7 +1183,7 @@ bus_activation_send_pending_auto_activation_messages (BusActivation  *activation
       BusPendingActivationEntry *entry = link->data;
       DBusList *next = _dbus_list_get_next_link (&pending_activation->entries, link);
 
-      if (entry->auto_activation && dbus_connection_get_is_connected (entry->connection))
+      if (entry->auto_activation && (entry->connection == NULL || dbus_connection_get_is_connected (entry->connection)))
         {
           DBusConnection *addressed_recipient;
 
@@ -1233,7 +1241,7 @@ try_send_activation_failure (BusPendingActivation *pending_activation,
       BusPendingActivationEntry *entry = link->data;
       DBusList *next = _dbus_list_get_next_link (&pending_activation->entries, link);
 
-      if (dbus_connection_get_is_connected (entry->connection))
+      if (entry->connection && dbus_connection_get_is_connected (entry->connection))
         {
           if (!bus_transaction_send_error_reply (transaction,
                                                  entry->connection,
@@ -1759,7 +1767,8 @@ bus_activation_activate_service (BusActivation  *activation,
   pending_activation_entry->activation_message = activation_message;
   dbus_message_ref (activation_message);
   pending_activation_entry->connection = connection;
-  dbus_connection_ref (connection);
+  if (connection)
+    dbus_connection_ref (connection);
 
   /* Check if the service is being activated */
   pending_activation = _dbus_hash_table_lookup_string (activation->pending_activations, service_name);
@@ -1972,7 +1981,7 @@ bus_activation_activate_service (BusActivation  *activation,
                                service_name,
                                entry->systemd_service);
               /* systemd is not around, let's "activate" it. */
-              retval = bus_activation_activate_service (activation, connection, activation_transaction, TRUE,
+              retval = bus_activation_activate_service (activation, NULL, activation_transaction, TRUE,
                                                         message, "org.freedesktop.systemd1", error);
             }