Allow the MITIGATION_WIN32K_DISABLE process mitigation to be set in the renderer sandbox.

content/common/sandbox_win.cc

 // Copyright (c) 2012 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 "content/common/sandbox_win.h"
 
 #include <string>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
@@ skipping 584 matching lines @@
   }
 
   sandbox::TargetPolicy* policy = g_broker_services->CreatePolicy();
 
   sandbox::MitigationFlags mitigations = sandbox::MITIGATION_HEAP_TERMINATE |
                                          sandbox::MITIGATION_BOTTOM_UP_ASLR |
                                          sandbox::MITIGATION_DEP |
                                          sandbox::MITIGATION_DEP_NO_ATL_THUNK |
                                          sandbox::MITIGATION_SEHOP;
 
+ if (base::win::GetVersion() >= base::win::VERSION_WIN8 &&
+     type_str == switches::kRendererProcess &&
+     browser_command_line.HasSwitch(
+        switches::kEnableWin32kRendererLockDown)) {
+   mitigations |= sandbox::MITIGATION_WIN32K_DISABLE;
+ }
+
   if (policy->SetProcessMitigations(mitigations) != sandbox::SBOX_ALL_OK)
     return 0;
 
   mitigations = sandbox::MITIGATION_STRICT_HANDLE_CHECKS |
                 sandbox::MITIGATION_DLL_SEARCH_ORDER;
 
   if (policy->SetDelayedProcessMitigations(mitigations) != sandbox::SBOX_ALL_OK)
     return 0;
 
   SetJobLevel(*cmd_line, sandbox::JOB_LOCKDOWN, 0, policy);
@@ skipping 115 matching lines @@
   }
 
   return false;
 }
 
 bool BrokerAddTargetPeer(HANDLE peer_process) {
   return g_broker_services->AddTargetPeer(peer_process) == sandbox::SBOX_ALL_OK;
 }
 
 }  // namespace content