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91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_WIN_SCOPED_HANDLE_VERIFIER_H_
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#define BASE_WIN_SCOPED_HANDLE_VERIFIER_H_
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#include "base/win/windows_types.h"
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#include <unordered_map>
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#include "base/base_export.h"
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#include "base/debug/stack_trace.h"
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#include "base/hash.h"
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#include "base/synchronization/lock_impl.h"
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#include "base/threading/thread_local.h"
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namespace base {
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namespace win {
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namespace internal {
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struct HandleHash {
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size_t operator()(const HANDLE& handle) const {
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char buffer[sizeof(handle)];
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memcpy(buffer, &handle, sizeof(handle));
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return base::Hash(buffer, sizeof(buffer));
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}
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};
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struct ScopedHandleVerifierInfo {
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const void* owner;
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const void* pc1;
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const void* pc2;
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base::debug::StackTrace stack;
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DWORD thread_id;
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};
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// Implements the actual object that is verifying handles for this process.
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// The active instance is shared across the module boundary but there is no
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// way to delete this object from the wrong side of it (or any side, actually).
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// We need [[clang::lto_visibility_public]] because instances of this class are
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// passed across module boundaries. This means different modules must have
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// compatible definitions of the class even when whole program optimization is
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// enabled - which is what this attribute accomplishes. The pragma stops MSVC
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// from emitting an unrecognized attribute warning.
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#pragma warning(push)
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#pragma warning(disable : 5030)
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class [[clang::lto_visibility_public]] ScopedHandleVerifier {
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#pragma warning(pop)
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public:
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explicit ScopedHandleVerifier(bool enabled);
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// Retrieves the current verifier.
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static ScopedHandleVerifier* Get();
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// The methods required by HandleTraits. They are virtual because we need to
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// forward the call execution to another module, instead of letting the
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// compiler call the version that is linked in the current module.
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virtual bool CloseHandle(HANDLE handle);
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virtual void StartTracking(HANDLE handle, const void* owner, const void* pc1,
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const void* pc2);
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virtual void StopTracking(HANDLE handle, const void* owner, const void* pc1,
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const void* pc2);
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virtual void Disable();
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virtual void OnHandleBeingClosed(HANDLE handle);
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virtual HMODULE GetModule() const;
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private:
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~ScopedHandleVerifier(); // Not implemented.
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static base::internal::LockImpl* GetLock();
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static void InstallVerifier();
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base::debug::StackTrace creation_stack_;
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bool enabled_;
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base::ThreadLocalBoolean closing_;
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base::internal::LockImpl* lock_;
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std::unordered_map<HANDLE, ScopedHandleVerifierInfo, HandleHash> map_;
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DISALLOW_COPY_AND_ASSIGN(ScopedHandleVerifier);
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};
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// This testing function returns the module that the ActiveVerifier concrete
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// implementation was instantiated in.
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BASE_EXPORT HMODULE GetHandleVerifierModuleForTesting();
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} // namespace internal
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} // namespace win
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} // namespace base
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#endif // BASE_WIN_SCOPED_HANDLE_VERIFIER_H_
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