Add sandbox support for Windows process mitigations

sandbox/win/src/dep.cc

Index: sandbox/win/src/dep.cc
===================================================================
--- sandbox/win/src/dep.cc	(revision 156579)
+++ sandbox/win/src/dep.cc	(working copy)
@@ -1,89 +0,0 @@
-// Copyright (c) 2006-2008 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/dep.h"
-
-#include <windows.h>
-
-#include "base/logging.h"
-
-namespace sandbox {
-
-namespace {
-
-// These values are in the Windows 2008 SDK but not in the previous ones. Define
-// the values here until we're sure everyone updated their SDK.
-#ifndef PROCESS_DEP_ENABLE
-#define PROCESS_DEP_ENABLE                          0x00000001
-#endif
-#ifndef PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION
-#define PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION     0x00000002
-#endif
-
-// SetProcessDEPPolicy is declared in the Windows 2008 SDK.
-typedef BOOL (WINAPI *FnSetProcessDEPPolicy)(DWORD dwFlags);
-
-enum PROCESS_INFORMATION_CLASS {
-  ProcessExecuteFlags = 0x22,
-};
-
-// Flags named as per their usage.
-const int MEM_EXECUTE_OPTION_ENABLE = 1;
-const int MEM_EXECUTE_OPTION_DISABLE = 2;
-const int MEM_EXECUTE_OPTION_ATL7_THUNK_EMULATION = 4;
-const int MEM_EXECUTE_OPTION_PERMANENT = 8;
-
-// Not exactly the right signature but that will suffice.
-typedef HRESULT (WINAPI *FnNtSetInformationProcess)(
-    HANDLE ProcessHandle,
-    PROCESS_INFORMATION_CLASS ProcessInformationClass,
-    PVOID ProcessInformation,
-    ULONG ProcessInformationLength);
-
-}  // namespace
-
-bool SetCurrentProcessDEP(DepEnforcement enforcement) {
-#ifdef _WIN64
-  // DEP is always on in x64.
-  return enforcement != DEP_DISABLED;
-#endif
-  // Only available on Windows XP SP2 and Windows Server 2003 SP1.
-  // For reference: http://www.uninformed.org/?v=2&a=4
-  FnNtSetInformationProcess NtSetInformationProc =
-      reinterpret_cast<FnNtSetInformationProcess>(
-          GetProcAddress(GetModuleHandle(L"ntdll.dll"),
-                                         "NtSetInformationProcess"));
-
-  if (!NtSetInformationProc)
-    return false;
-
-  // Flags being used as per SetProcessDEPPolicy on Vista SP1.
-  ULONG dep_flags;
-  switch (enforcement) {
-    case DEP_DISABLED:
-      // 2
-      dep_flags = MEM_EXECUTE_OPTION_DISABLE;
-      break;
-    case DEP_ENABLED:
-      // 9
-      dep_flags = MEM_EXECUTE_OPTION_PERMANENT | MEM_EXECUTE_OPTION_ENABLE;
-      break;
-    case DEP_ENABLED_ATL7_COMPAT:
-      // 0xD
-      dep_flags = MEM_EXECUTE_OPTION_PERMANENT | MEM_EXECUTE_OPTION_ENABLE |
-                  MEM_EXECUTE_OPTION_ATL7_THUNK_EMULATION;
-      break;
-    default:
-      NOTREACHED();
-      return false;
-  }
-
-  HRESULT status = NtSetInformationProc(GetCurrentProcess(),
-                                        ProcessExecuteFlags,
-                                        &dep_flags,
-                                        sizeof(dep_flags));
-  return SUCCEEDED(status);
-}
-
-}  // namespace sandbox