From f0a7395b3006360905ccdc642982f9fc67378927 Mon Sep 17 00:00:00 2001
From: Ray Strode <rstrode@redhat.com>
Date: Wed, 23 Jan 2019 15:59:42 -0500
Subject: [PATCH] shellActionModes: disable POPUP keybindings in unlock screen

Certain keybindings should continue to work even when a popup
menu is on screen. For instance, the keybinding for showing
the app menu and the keyinding for showing the calendar are
examples.

This is achieved by putting in place a special "POPUP" action
mode, whenever a popup menu is active.  This mode replaces
the (e.g., "NORMAL" or "OVERVIEW") action mode that was in place
for as long as the popup menu is active.

But those keybindings should not work when the user is at the
unlock dialog (which uses an action mode of "UNLOCK").

Unfortunately, since commit c79d24b6 they do.

This commit addresses the problem by forcing the action mode
to NONE at the unlock screen when popups are visible.

CVE-2019-3820

Closes https://gitlab.gnome.org/GNOME/gnome-shell/issues/851
---
 js/gdm/authPrompt.js  | 3 ++-
 js/gdm/loginDialog.js | 3 ++-
 js/ui/shellEntry.js   | 6 ++++--
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/js/gdm/authPrompt.js b/js/gdm/authPrompt.js
index 6dd5cdba6..eb21d9655 100644
--- a/js/gdm/authPrompt.js
+++ b/js/gdm/authPrompt.js
@@ -10,6 +10,7 @@ const Animation = imports.ui.animation;
 const Batch = imports.gdm.batch;
 const GdmUtil = imports.gdm.util;
 const Params = imports.misc.params;
+const Shell = imports.gi.Shell;
 const ShellEntry = imports.ui.shellEntry;
 const Tweener = imports.ui.tweener;
 const UserWidget = imports.ui.userWidget;
@@ -96,7 +97,7 @@ var AuthPrompt = class {
                          x_align: St.Align.START });
         this._entry = new St.Entry({ style_class: 'login-dialog-prompt-entry',
                                      can_focus: true });
-        ShellEntry.addContextMenu(this._entry, { isPassword: true });
+        ShellEntry.addContextMenu(this._entry, { isPassword: true, actionMode: Shell.ActionMode.NONE });
 
         this.actor.add(this._entry,
                        { expand: true,
diff --git a/js/gdm/loginDialog.js b/js/gdm/loginDialog.js
index 55ba3801e..dc125c213 100644
--- a/js/gdm/loginDialog.js
+++ b/js/gdm/loginDialog.js
@@ -334,7 +334,8 @@ var SessionMenuButton = class {
                  this._button.remove_style_pseudo_class('active');
         });
 
-        this._manager = new PopupMenu.PopupMenuManager({ actor: this._button });
+        this._manager = new PopupMenu.PopupMenuManager({ actor: this._button },
+                                                       { actionMode: Shell.ActionMode.NONE });
         this._manager.addMenu(this._menu);
 
         this._button.connect('clicked', () => { this._menu.toggle(); });
diff --git a/js/ui/shellEntry.js b/js/ui/shellEntry.js
index 0b733eb65..d16de9286 100644
--- a/js/ui/shellEntry.js
+++ b/js/ui/shellEntry.js
@@ -7,6 +7,7 @@ const BoxPointer = imports.ui.boxpointer;
 const Main = imports.ui.main;
 const Params = imports.misc.params;
 const PopupMenu = imports.ui.popupMenu;
+const Shell = imports.gi.Shell;
 
 var EntryMenu = class extends PopupMenu.PopupMenu {
     constructor(entry) {
@@ -145,11 +146,12 @@ function addContextMenu(entry, params) {
     if (entry.menu)
         return;
 
-    params = Params.parse (params, { isPassword: false });
+    params = Params.parse (params, { isPassword: false, actionMode: Shell.ActionMode.POPUP });
 
     entry.menu = new EntryMenu(entry);
     entry.menu.isPassword = params.isPassword;
-    entry._menuManager = new PopupMenu.PopupMenuManager({ actor: entry });
+    entry._menuManager = new PopupMenu.PopupMenuManager({ actor: entry },
+                                                        { actionMode: params.actionMode });
     entry._menuManager.addMenu(entry.menu);
 
     // Add an event handler to both the entry and its clutter_text; the former