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// Copyright (c) 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.
#ifndef SANDBOX_SRC_SIDESTEP_RESOLVER_H__
#define SANDBOX_SRC_SIDESTEP_RESOLVER_H__
#include "base/basictypes.h"
#include "sandbox/win/src/nt_internals.h"
#include "sandbox/win/src/resolver.h"
namespace sandbox {
// This is the concrete resolver used to perform sidestep interceptions.
class SidestepResolverThunk : public ResolverThunk {
public:
SidestepResolverThunk() {}
~SidestepResolverThunk() override {}
// Implementation of Resolver::Setup.
NTSTATUS 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) override;
// Implementation of Resolver::GetThunkSize.
size_t GetThunkSize() const override;
private:
DISALLOW_COPY_AND_ASSIGN(SidestepResolverThunk);
};
// This is the concrete resolver used to perform smart sidestep interceptions.
// This means basically a sidestep interception that skips the interceptor when
// the caller resides on the same dll being intercepted. It is intended as
// a helper only, because that determination is not infallible.
class SmartSidestepResolverThunk : public SidestepResolverThunk {
public:
SmartSidestepResolverThunk() {}
~SmartSidestepResolverThunk() override {}
// Implementation of Resolver::Setup.
NTSTATUS 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) override;
// Implementation of Resolver::GetThunkSize.
size_t GetThunkSize() const override;
private:
// Performs the actual call to the interceptor if the conditions are correct
// (as determined by IsInternalCall).
static void SmartStub();
// Returns true if return_address is inside the module loaded at base.
static bool IsInternalCall(const void* base, void* return_address);
DISALLOW_COPY_AND_ASSIGN(SmartSidestepResolverThunk);
};
} // namespace sandbox
#endif // SANDBOX_SRC_SIDESTEP_RESOLVER_H__
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