Intercept the user32!SystemParametersInfoW API in the win32k user gdi lockdown mode

sandbox/win/src/process_mitigations_win32k_interception.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sandbox/win/src/process_mitigations_win32k_interception.h"
 
 namespace sandbox {
 
 BOOL WINAPI TargetGdiDllInitialize(
     GdiDllInitializeFunction orig_gdi_dll_initialize,
     HANDLE dll,
     DWORD reason) {
   return TRUE;
 }
 
 HGDIOBJ WINAPI TargetGetStockObject(
     GetStockObjectFunction orig_get_stock_object,
     int object) {
   return reinterpret_cast<HGDIOBJ>(NULL);
 }
 
 ATOM WINAPI TargetRegisterClassW(
     RegisterClassWFunction orig_register_class_function,
     const WNDCLASS* wnd_class) {
   return TRUE;
 }
 
+BOOL WINAPI TargetSystemParametersInfoW(
+    SystemParametersInfoWFunction orig_system_parameters_info,
+    UINT action,
+    UINT ui_param,
+    PVOID value,
+    UINT win_ini) {
+  // The SystemParametersInfo API fails for the following font related
+  // parameters in the win32k lockdown mode. We fake the values for
+  // SPI_GETFONTSMOOTHING and SPI_GETFONTSMOOTHINGTYPE for now and default to
+  // smooth and FE_FONTSMOOTHINGCLEARTYPE for now. This should be ok given that
+  // this code only runs on Windows 8 and above.
+  // TODO(ananta)
+  // Revisit and handle this via browser side IPCs if needed.
+  if (action == SPI_GETFONTSMOOTHING) {
+    BOOL* smoothing = reinterpret_cast<BOOL*>(value);
+    if (smoothing) {
+      *smoothing = TRUE;
+      return TRUE;
+    }
+  } else if (action == SPI_GETFONTSMOOTHINGTYPE) {
+    UINT* smooth_type = reinterpret_cast<UINT*>(value);
+    if (smooth_type) {
+      *smooth_type = FE_FONTSMOOTHINGCLEARTYPE;
+      return TRUE;
+    }
+  }
+  return orig_system_parameters_info(action, ui_param, value, win_ini);
+}
+
 }  // namespace sandbox