gdm/SOURCES/0051-display-Handle-failure-before-display-registration.patch

From f6a8a36717afc7ce00bdb2305a6219c28abc36fb Mon Sep 17 00:00:00 2001
From: Ray Strode <rstrode@redhat.com>
Date: Tue, 1 Sep 2020 13:49:27 -0400
Subject: [PATCH 51/51] display: Handle failure before display registration

Normally, e.g., gdm-wayland-session would register its display
before starting the session.  This display registration is how
the display moves to the "managed" state.  We currently detect
session failure in gdm_display_unmanage. If gdm-wayland-session
is killed before it registers the display, gdm_display_unmanage
won't run, and failure won't be detected.

This commit make gdm_display_unmanage get called, even if the
display isn't yet fully managed.
---
 daemon/gdm-display.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/daemon/gdm-display.c b/daemon/gdm-display.c
index ae20491cd..b8ccbbd72 100644
--- a/daemon/gdm-display.c
+++ b/daemon/gdm-display.c
@@ -575,80 +575,79 @@ gdm_display_disconnect (GdmDisplay *self)
                 return;
         }
 
         setup = xcb_get_setup (self->priv->xcb_connection);
 
         /* resource_id_mask is the bits given to each client for
          * addressing resources */
         highest_client = (XID) ~unused_bits & ~setup->resource_id_mask;
         client_increment = setup->resource_id_mask + 1;
 
         /* Kill every client but ourselves, then close our own connection
          */
         for (client = 0;
              client <= highest_client;
              client += client_increment) {
 
                 if (client != setup->resource_id_base)
                         xcb_kill_client (self->priv->xcb_connection, client);
         }
 
         xcb_flush (self->priv->xcb_connection);
 
         g_clear_pointer (&self->priv->xcb_connection, xcb_disconnect);
 }
 
 gboolean
 gdm_display_unmanage (GdmDisplay *self)
 {
         g_return_val_if_fail (GDM_IS_DISPLAY (self), FALSE);
 
-        g_debug ("GdmDisplay: unmanage display");
-
         gdm_display_disconnect (self);
 
         if (self->priv->user_access_file != NULL) {
                 gdm_display_access_file_close (self->priv->user_access_file);
                 g_object_unref (self->priv->user_access_file);
                 self->priv->user_access_file = NULL;
         }
 
         if (self->priv->access_file != NULL) {
                 gdm_display_access_file_close (self->priv->access_file);
                 g_object_unref (self->priv->access_file);
                 self->priv->access_file = NULL;
         }
 
         if (!self->priv->session_registered) {
                 g_warning ("GdmDisplay: Session never registered, failing");
                 _gdm_display_set_status (self, GDM_DISPLAY_FAILED);
         } else {
+                g_debug ("GdmDisplay: Unmanage display");
                 _gdm_display_set_status (self, GDM_DISPLAY_UNMANAGED);
         }
 
         return TRUE;
 }
 
 gboolean
 gdm_display_get_id (GdmDisplay         *self,
                     char              **id,
                     GError            **error)
 {
         g_return_val_if_fail (GDM_IS_DISPLAY (self), FALSE);
 
         if (id != NULL) {
                 *id = g_strdup (self->priv->id);
         }
 
         return TRUE;
 }
 
 gboolean
 gdm_display_get_x11_display_name (GdmDisplay   *self,
                                   char        **x11_display,
                                   GError      **error)
 {
         g_return_val_if_fail (GDM_IS_DISPLAY (self), FALSE);
 
         if (x11_display != NULL) {
                 *x11_display = g_strdup (self->priv->x11_display_name);
         }
@@ -1309,63 +1308,62 @@ gdm_display_finalize (GObject *object)
 
 GDBusObjectSkeleton *
 gdm_display_get_object_skeleton (GdmDisplay *self)
 {
         return self->priv->object_skeleton;
 }
 
 static void
 on_launch_environment_session_opened (GdmLaunchEnvironment *launch_environment,
                                       GdmDisplay           *self)
 {
         char       *session_id;
 
         g_debug ("GdmDisplay: Greeter session opened");
         session_id = gdm_launch_environment_get_session_id (launch_environment);
         _gdm_display_set_session_id (self, session_id);
         g_free (session_id);
 }
 
 static void
 on_launch_environment_session_started (GdmLaunchEnvironment *launch_environment,
                                        GdmDisplay           *self)
 {
         g_debug ("GdmDisplay: Greeter started");
 }
 
 static void
 self_destruct (GdmDisplay *self)
 {
         g_object_ref (self);
-        if (gdm_display_get_status (self) == GDM_DISPLAY_MANAGED) {
-                gdm_display_unmanage (self);
-        }
+        g_debug ("GdmDisplay: initiating display self-destruct");
+        gdm_display_unmanage (self);
 
         if (gdm_display_get_status (self) != GDM_DISPLAY_FINISHED) {
                 queue_finish (self);
         }
         g_object_unref (self);
 }
 
 static void
 on_launch_environment_session_stopped (GdmLaunchEnvironment *launch_environment,
                                        GdmDisplay           *self)
 {
         g_debug ("GdmDisplay: Greeter stopped");
         self_destruct (self);
 }
 
 static void
 on_launch_environment_session_exited (GdmLaunchEnvironment *launch_environment,
                                       int                   code,
                                       GdmDisplay           *self)
 {
         g_debug ("GdmDisplay: Greeter exited: %d", code);
         self_destruct (self);
 }
 
 static void
 on_launch_environment_session_died (GdmLaunchEnvironment *launch_environment,
                                     int                   signal,
                                     GdmDisplay           *self)
 {
         g_debug ("GdmDisplay: Greeter died: %d", signal);
-- 
2.27.0