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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "sandbox/src/dep.h"
#include "base/logging.h"
#include "base/win_util.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);
// Completely undocumented from Microsoft. You can find this information by
// disassembling Vista's SP1 kernel32.dll with your favorite disassembler.
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
// Try documented ways first.
// Only available on Vista SP1 and Windows 2008.
// http://msdn.microsoft.com/en-us/library/bb736299.aspx
FnSetProcessDEPPolicy SetProcDEP =
reinterpret_cast<FnSetProcessDEPPolicy>(
GetProcAddress(GetModuleHandle(L"kernel32.dll"),
"SetProcessDEPPolicy"));
if (SetProcDEP) {
ULONG dep_flags;
switch (enforcement) {
case DEP_DISABLED:
dep_flags = 0;
break;
case DEP_ENABLED:
dep_flags = PROCESS_DEP_ENABLE |
PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION;
break;
case DEP_ENABLED_ATL7_COMPAT:
dep_flags = PROCESS_DEP_ENABLE;
break;
default:
NOTREACHED();
return false;
}
return 0 != SetProcDEP(dep_flags);
}
// Go in darker areas.
// Only available on Windows XP SP2 and Windows Server 2003 SP1.
// 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
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