user32: Limit broadcast messages to system and registered ones.

dlls/user32/message.c

@@ -3232,6 +3232,10 @@ static LRESULT send_inter_thread_callback( HWND hwnd, UINT msg, WPARAM wp, LPARA
     return send_inter_thread_message( info, result );
 }
 
+static BOOL is_message_broadcastable(UINT msg)
+{
+    return msg < WM_USER || msg >= 0xc000;
+}
 
 /***********************************************************************
  *		send_message
@@ -3246,7 +3250,8 @@ static BOOL send_message( struct send_message_info *info, DWORD_PTR *res_ptr, BO
 
     if (is_broadcast(info->hwnd))
     {
-        EnumWindows( broadcast_message_callback, (LPARAM)info );
+        if (is_message_broadcastable( info->msg ))
+            EnumWindows( broadcast_message_callback, (LPARAM)info );
         if (res_ptr) *res_ptr = 1;
         return TRUE;
     }
@@ -3659,7 +3664,8 @@ BOOL WINAPI PostMessageW( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )
 
     if (is_broadcast(hwnd))
     {
-        EnumWindows( broadcast_message_callback, (LPARAM)&info );
+        if (is_message_broadcastable( info.msg ))
+            EnumWindows( broadcast_message_callback, (LPARAM)&info );
         return TRUE;
     }
 

dlls/user32/tests/msg.c

@@ -14047,7 +14047,6 @@ static void test_broadcast(void)
         }
         else
         {
-        todo_wine
             ok(!ret, "%d: message %04x, got %d, error %d\n", i, messages[i], ret, GetLastError());
         }
 
@@ -14064,7 +14063,6 @@ static void test_broadcast(void)
         }
         else
         {
-        todo_wine
             ok(!ret, "%d: got %d, error %d\n", i, ret, GetLastError());
         }
 
@@ -14082,7 +14080,6 @@ static void test_broadcast(void)
             }
             else
             {
-            todo_wine
                 ok(g_broadcast_lparam == 0xdead, "%d: message %04x, got %#lx, error %d\n", i, messages[i],
                     g_broadcast_lparam, GetLastError());
             }
@@ -14102,7 +14099,6 @@ static void test_broadcast(void)
             }
             else
             {
-            todo_wine
                 ok(g_broadcast_lparam == 0xdead, "%d: message %04x, got %#lx, error %d\n", i, messages[i],
                     g_broadcast_lparam, GetLastError());
             }