1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef SANDBOX_SRC_WOW64_H__
6#define SANDBOX_SRC_WOW64_H__
7
8#include <windows.h>
9
10#include "base/basictypes.h"
11#include "sandbox/win/src/sandbox_types.h"
12
13namespace sandbox {
14
15class TargetProcess;
16
17// This class wraps the code needed to interact with the Windows On Windows
18// subsystem on 64 bit OSes, from the point of view of interceptions.
19class Wow64 {
20 public:
21  Wow64(TargetProcess* child, HMODULE ntdll)
22      : child_(child), ntdll_(ntdll), dll_load_(NULL), continue_load_(NULL) {}
23  ~Wow64();
24
25  // Waits for the 32 bit DLL to get loaded on the child process. This function
26  // will return immediately if not running under WOW, or launch the helper
27  // process and wait until ntdll is ready.
28  bool WaitForNtdll();
29
30 private:
31  // Runs the WOW helper process, passing the address of a buffer allocated on
32  // the child (one page).
33  bool RunWowHelper(void* buffer);
34
35  // This method receives "notifications" whenever a DLL is mapped on the child.
36  bool DllMapped();
37
38  // Returns true if ntdll.dll is mapped on the child.
39  bool NtdllPresent();
40
41  TargetProcess* child_;  // Child process.
42  HMODULE ntdll_;         // ntdll on the parent.
43  HANDLE dll_load_;       // Event that is signaled on dll load.
44  HANDLE continue_load_;  // Event to signal to continue execution on the child.
45  DISALLOW_IMPLICIT_CONSTRUCTORS(Wow64);
46};
47
48}  // namespace sandbox
49
50#endif  // SANDBOX_SRC_WOW64_H__
51