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// Copyright (c) 2006-2010 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/src/eat_resolver.h"
#include "base/win/pe_image.h"
#include "sandbox/src/sandbox_nt_util.h"
namespace sandbox {
NTSTATUS EatResolverThunk::Setup(const void* target_module,
const void* interceptor_module,
const char* target_name,
const char* interceptor_name,
const void* interceptor_entry_point,
void* thunk_storage,
size_t storage_bytes,
size_t* storage_used) {
NTSTATUS ret = Init(target_module, interceptor_module, target_name,
interceptor_name, interceptor_entry_point,
thunk_storage, storage_bytes);
if (!NT_SUCCESS(ret))
return ret;
if (!eat_entry_)
return STATUS_INVALID_PARAMETER;
size_t thunk_bytes = GetInternalThunkSize();
#if defined(_WIN64)
// We have two thunks, in order: the return path and the forward path.
if (!SetInternalThunk(thunk_storage, storage_bytes, NULL, target_))
return STATUS_BUFFER_TOO_SMALL;
storage_bytes -= thunk_bytes;
thunk_storage = reinterpret_cast<char*>(thunk_storage) + thunk_bytes;
#endif
if (!SetInternalThunk(thunk_storage, storage_bytes, target_, interceptor_))
return STATUS_BUFFER_TOO_SMALL;
AutoProtectMemory memory;
memory.ChangeProtection(eat_entry_, sizeof(DWORD), PAGE_READWRITE);
// Perform the patch.
#pragma warning(push)
#pragma warning(disable: 4311)
// These casts generate warnings because they are 32 bit specific.
*eat_entry_ = reinterpret_cast<DWORD>(thunk_storage) -
reinterpret_cast<DWORD>(target_module);
#pragma warning(pop)
if (NULL != storage_used)
*storage_used = GetThunkSize();
return ret;
}
NTSTATUS EatResolverThunk::ResolveTarget(const void* module,
const char* function_name,
void** address) {
DCHECK_NT(address);
if (!module)
return STATUS_INVALID_PARAMETER;
base::win::PEImage pe(module);
if (!pe.VerifyMagic())
return STATUS_INVALID_IMAGE_FORMAT;
eat_entry_ = pe.GetExportEntry(function_name);
if (!eat_entry_)
return STATUS_PROCEDURE_NOT_FOUND;
*address = pe.RVAToAddr(*eat_entry_);
return STATUS_SUCCESS;
}
size_t EatResolverThunk::GetThunkSize() const {
#if defined(_WIN64)
return GetInternalThunkSize() * 2;
#else
return GetInternalThunkSize();
#endif
}
} // namespace sandbox
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