563 lines
19 KiB
C++
563 lines
19 KiB
C++
// Copyright (c) 2006-2008 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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// Static class for hooking Win32 API routines.
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// Some notes about how to hook Memory Allocation Routines in Windows.
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//
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// For our purposes we do not hook the libc routines. There are two
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// reasons for this. First, the libc routines all go through HeapAlloc
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// anyway. So, it's redundant to log both HeapAlloc and malloc.
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// Second, it can be tricky to hook in both static and dynamic linkages
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// of libc.
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#include <windows.h>
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#include "memory_hook.h"
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#include "memory_watcher.h"
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#include "preamble_patcher.h"
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// Calls GetProcAddress, but casts to the correct type.
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#define GET_PROC_ADDRESS(hmodule, name) \
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( (Type_##name)(::GetProcAddress(hmodule, #name)) )
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// Macro to declare Patch functions.
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#define DECLARE_PATCH(name) Patch<Type_##name> patch_##name
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// Macro to install Patch functions.
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#define INSTALL_PATCH(name) do { \
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patch_##name.set_original(GET_PROC_ADDRESS(hkernel32, ##name)); \
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patch_##name.Install(&Perftools_##name); \
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} while (0)
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// Macro to install Patch functions.
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#define INSTALL_NTDLLPATCH(name) do { \
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patch_##name.set_original(GET_PROC_ADDRESS(hntdll, ##name)); \
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patch_##name.Install(&Perftools_##name); \
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} while (0)
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// Macro to uninstall Patch functions.
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#define UNINSTALL_PATCH(name) patch_##name.Uninstall();
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// Windows APIs to be hooked
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// HeapAlloc routines
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typedef HANDLE (WINAPI *Type_HeapCreate)(DWORD flOptions,
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SIZE_T dwInitialSize,
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SIZE_T dwMaximumSize);
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typedef BOOL (WINAPI *Type_HeapDestroy)(HANDLE hHeap);
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typedef LPVOID (WINAPI *Type_HeapAlloc)(HANDLE hHeap, DWORD dwFlags,
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DWORD_PTR dwBytes);
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typedef LPVOID (WINAPI *Type_HeapReAlloc)(HANDLE hHeap, DWORD dwFlags,
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LPVOID lpMem, SIZE_T dwBytes);
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typedef BOOL (WINAPI *Type_HeapFree)(HANDLE hHeap, DWORD dwFlags,
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LPVOID lpMem);
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// GlobalAlloc routines
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typedef HGLOBAL (WINAPI *Type_GlobalAlloc)(UINT uFlags, SIZE_T dwBytes);
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typedef HGLOBAL (WINAPI *Type_GlobalReAlloc)(HGLOBAL hMem, SIZE_T dwBytes,
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UINT uFlags);
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typedef HGLOBAL (WINAPI *Type_GlobalFree)(HGLOBAL hMem);
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// LocalAlloc routines
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typedef HLOCAL (WINAPI *Type_LocalAlloc)(UINT uFlags, SIZE_T uBytes);
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typedef HLOCAL (WINAPI *Type_LocalReAlloc)(HLOCAL hMem, SIZE_T uBytes,
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UINT uFlags);
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typedef HLOCAL (WINAPI *Type_LocalFree)(HLOCAL hMem);
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// A Windows-API equivalent of mmap and munmap, for "anonymous regions"
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typedef LPVOID (WINAPI *Type_VirtualAllocEx)(HANDLE process, LPVOID address,
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SIZE_T size, DWORD type,
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DWORD protect);
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typedef BOOL (WINAPI *Type_VirtualFreeEx)(HANDLE process, LPVOID address,
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SIZE_T size, DWORD type);
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// A Windows-API equivalent of mmap and munmap, for actual files
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typedef LPVOID (WINAPI *Type_MapViewOfFile)(HANDLE hFileMappingObject,
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DWORD dwDesiredAccess,
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DWORD dwFileOffsetHigh,
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DWORD dwFileOffsetLow,
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SIZE_T dwNumberOfBytesToMap);
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typedef LPVOID (WINAPI *Type_MapViewOfFileEx)(HANDLE hFileMappingObject,
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DWORD dwDesiredAccess,
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DWORD dwFileOffsetHigh,
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DWORD dwFileOffsetLow,
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SIZE_T dwNumberOfBytesToMap,
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LPVOID lpBaseAddress);
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typedef BOOL (WINAPI *Type_UnmapViewOfFile)(LPVOID lpBaseAddress);
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typedef DWORD (WINAPI *Type_NtUnmapViewOfSection)(HANDLE process,
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LPVOID lpBaseAddress);
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// Patch is a template for keeping the pointer to the original
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// hooked routine, the function to call when hooked, and the
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// stub routine which is patched.
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template<class T>
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class Patch {
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public:
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// Constructor. Does not hook the function yet.
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Patch<T>()
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: original_function_(NULL),
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patch_function_(NULL),
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stub_function_(NULL) {
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}
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// Destructor. Unhooks the function if it has been hooked.
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~Patch<T>() {
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Uninstall();
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}
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// Patches original function with func.
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// Must have called set_original to set the original function.
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void Install(T func) {
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patch_function_ = func;
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CHECK(patch_function_ != NULL);
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CHECK(original_function_ != NULL);
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CHECK(stub_function_ == NULL);
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CHECK(sidestep::SIDESTEP_SUCCESS ==
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sidestep::PreamblePatcher::Patch(original_function_,
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patch_function_, &stub_function_));
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}
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// Un-patches the function.
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void Uninstall() {
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if (stub_function_)
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sidestep::PreamblePatcher::Unpatch(original_function_,
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patch_function_, stub_function_);
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stub_function_ = NULL;
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}
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// Set the function to be patched.
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void set_original(T original) { original_function_ = original; }
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// Get the original function being patched.
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T original() { return original_function_; }
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// Get the patched function. (e.g. the replacement function)
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T patched() { return patch_function_; }
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// Access to the stub for calling the original function
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// while it is patched.
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T operator()() {
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DCHECK(stub_function_);
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return stub_function_;
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}
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private:
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// The function that we plan to patch.
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T original_function_;
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// The function to replace the original with.
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T patch_function_;
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// To unpatch, we also need to keep around a "stub" that points to the
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// pre-patched Windows function.
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T stub_function_;
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};
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// All Windows memory-allocation routines call through to one of these.
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DECLARE_PATCH(HeapCreate);
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DECLARE_PATCH(HeapDestroy);
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DECLARE_PATCH(HeapAlloc);
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DECLARE_PATCH(HeapReAlloc);
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DECLARE_PATCH(HeapFree);
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DECLARE_PATCH(VirtualAllocEx);
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DECLARE_PATCH(VirtualFreeEx);
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DECLARE_PATCH(MapViewOfFile);
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DECLARE_PATCH(MapViewOfFileEx);
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DECLARE_PATCH(UnmapViewOfFile);
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DECLARE_PATCH(GlobalAlloc);
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DECLARE_PATCH(GlobalReAlloc);
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DECLARE_PATCH(GlobalFree);
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DECLARE_PATCH(LocalAlloc);
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DECLARE_PATCH(LocalReAlloc);
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DECLARE_PATCH(LocalFree);
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DECLARE_PATCH(NtUnmapViewOfSection);
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// Our replacement functions.
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static HANDLE WINAPI Perftools_HeapCreate(DWORD flOptions,
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SIZE_T dwInitialSize,
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SIZE_T dwMaximumSize) {
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if (dwInitialSize > 4096)
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dwInitialSize = 4096;
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return patch_HeapCreate()(flOptions, dwInitialSize, dwMaximumSize);
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}
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static BOOL WINAPI Perftools_HeapDestroy(HANDLE hHeap) {
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return patch_HeapDestroy()(hHeap);
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}
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static LPVOID WINAPI Perftools_HeapAlloc(HANDLE hHeap, DWORD dwFlags,
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DWORD_PTR dwBytes) {
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LPVOID rv = patch_HeapAlloc()(hHeap, dwFlags, dwBytes);
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MemoryHook::hook()->OnTrack(hHeap, reinterpret_cast<int32>(rv), dwBytes);
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return rv;
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}
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static BOOL WINAPI Perftools_HeapFree(HANDLE hHeap, DWORD dwFlags,
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LPVOID lpMem) {
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size_t size = 0;
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if (lpMem != 0) {
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size = HeapSize(hHeap, 0, lpMem); // Will crash if lpMem is 0.
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// Note: size could be 0; HeapAlloc does allocate 0 length buffers.
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}
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MemoryHook::hook()->OnUntrack(hHeap, reinterpret_cast<int32>(lpMem), size);
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return patch_HeapFree()(hHeap, dwFlags, lpMem);
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}
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static LPVOID WINAPI Perftools_HeapReAlloc(HANDLE hHeap, DWORD dwFlags,
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LPVOID lpMem, SIZE_T dwBytes) {
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// Don't call realloc, but instead do a free/malloc. The problem is that
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// the builtin realloc may either expand a buffer, or it may simply
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// just call free/malloc. If so, we will already have tracked the new
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// block via Perftools_HeapAlloc.
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LPVOID rv = Perftools_HeapAlloc(hHeap, dwFlags, dwBytes);
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DCHECK_EQ((HEAP_REALLOC_IN_PLACE_ONLY & dwFlags), 0);
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// If there was an old buffer, now copy the data to the new buffer.
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if (lpMem != 0) {
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size_t size = HeapSize(hHeap, 0, lpMem);
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if (size > dwBytes)
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size = dwBytes;
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// Note: size could be 0; HeapAlloc does allocate 0 length buffers.
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memcpy(rv, lpMem, size);
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Perftools_HeapFree(hHeap, dwFlags, lpMem);
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}
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return rv;
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}
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static LPVOID WINAPI Perftools_VirtualAllocEx(HANDLE process, LPVOID address,
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SIZE_T size, DWORD type,
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DWORD protect) {
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bool already_committed = false;
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if (address != NULL) {
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MEMORY_BASIC_INFORMATION info;
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CHECK(VirtualQuery(address, &info, sizeof(info)));
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if (info.State & MEM_COMMIT) {
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already_committed = true;
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CHECK(size >= info.RegionSize);
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}
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}
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bool reserving = (address == NULL) || (type & MEM_RESERVE);
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bool committing = !already_committed && (type & MEM_COMMIT);
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LPVOID result = patch_VirtualAllocEx()(process, address, size, type,
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protect);
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MEMORY_BASIC_INFORMATION info;
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CHECK(VirtualQuery(result, &info, sizeof(info)));
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size = info.RegionSize;
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if (committing)
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MemoryHook::hook()->OnTrack(0, reinterpret_cast<int32>(result), size);
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return result;
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}
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static BOOL WINAPI Perftools_VirtualFreeEx(HANDLE process, LPVOID address,
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SIZE_T size, DWORD type) {
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int chunk_size = size;
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MEMORY_BASIC_INFORMATION info;
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CHECK(VirtualQuery(address, &info, sizeof(info)));
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if (chunk_size == 0)
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chunk_size = info.RegionSize;
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bool decommit = (info.State & MEM_COMMIT);
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if (decommit)
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MemoryHook::hook()->OnUntrack(0, reinterpret_cast<int32>(address),
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chunk_size);
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return patch_VirtualFreeEx()(process, address, size, type);
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}
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static base::Lock known_maps_lock;
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static std::map<void*, int> known_maps;
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static LPVOID WINAPI Perftools_MapViewOfFileEx(HANDLE hFileMappingObject,
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DWORD dwDesiredAccess,
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DWORD dwFileOffsetHigh,
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DWORD dwFileOffsetLow,
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SIZE_T dwNumberOfBytesToMap,
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LPVOID lpBaseAddress) {
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// For this function pair, you always deallocate the full block of
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// data that you allocate, so NewHook/DeleteHook is the right API.
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LPVOID result = patch_MapViewOfFileEx()(hFileMappingObject, dwDesiredAccess,
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dwFileOffsetHigh, dwFileOffsetLow,
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dwNumberOfBytesToMap, lpBaseAddress);
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{
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base::AutoLock lock(known_maps_lock);
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MEMORY_BASIC_INFORMATION info;
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if (known_maps.find(result) == known_maps.end()) {
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CHECK(VirtualQuery(result, &info, sizeof(info)));
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// TODO(mbelshe): THIS map uses the standard heap!!!!
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known_maps[result] = 1;
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MemoryHook::hook()->OnTrack(0, reinterpret_cast<int32>(result),
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info.RegionSize);
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} else {
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known_maps[result] = known_maps[result] + 1;
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}
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}
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return result;
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}
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static LPVOID WINAPI Perftools_MapViewOfFile(HANDLE hFileMappingObject,
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DWORD dwDesiredAccess,
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DWORD dwFileOffsetHigh,
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DWORD dwFileOffsetLow,
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SIZE_T dwNumberOfBytesToMap) {
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return Perftools_MapViewOfFileEx(hFileMappingObject, dwDesiredAccess,
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dwFileOffsetHigh, dwFileOffsetLow,
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dwNumberOfBytesToMap, 0);
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}
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static BOOL WINAPI Perftools_UnmapViewOfFile(LPVOID lpBaseAddress) {
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// This will call into NtUnmapViewOfSection().
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return patch_UnmapViewOfFile()(lpBaseAddress);
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}
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static DWORD WINAPI Perftools_NtUnmapViewOfSection(HANDLE process,
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LPVOID lpBaseAddress) {
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// Some windows APIs call directly into this routine rather
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// than calling UnmapViewOfFile. If we didn't trap this function,
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// then we appear to have bogus leaks.
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{
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base::AutoLock lock(known_maps_lock);
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MEMORY_BASIC_INFORMATION info;
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CHECK(VirtualQuery(lpBaseAddress, &info, sizeof(info)));
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if (known_maps.find(lpBaseAddress) != known_maps.end()) {
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if (known_maps[lpBaseAddress] == 1) {
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MemoryHook::hook()->OnUntrack(0, reinterpret_cast<int32>(lpBaseAddress),
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info.RegionSize);
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known_maps.erase(lpBaseAddress);
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} else {
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known_maps[lpBaseAddress] = known_maps[lpBaseAddress] - 1;
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}
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}
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}
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return patch_NtUnmapViewOfSection()(process, lpBaseAddress);
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}
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static HGLOBAL WINAPI Perftools_GlobalAlloc(UINT uFlags, SIZE_T dwBytes) {
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// GlobalAlloc is built atop HeapAlloc anyway. So we don't track these.
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// GlobalAlloc will internally call into HeapAlloc and we track there.
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// Force all memory to be fixed.
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uFlags &= ~GMEM_MOVEABLE;
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HGLOBAL rv = patch_GlobalAlloc()(uFlags, dwBytes);
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return rv;
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}
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static HGLOBAL WINAPI Perftools_GlobalFree(HGLOBAL hMem) {
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return patch_GlobalFree()(hMem);
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}
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static HGLOBAL WINAPI Perftools_GlobalReAlloc(HGLOBAL hMem, SIZE_T dwBytes,
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UINT uFlags) {
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// TODO(jar): [The following looks like a copy/paste typo from LocalRealloc.]
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// GlobalDiscard is a macro which calls LocalReAlloc with size 0.
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if (dwBytes == 0) {
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return patch_GlobalReAlloc()(hMem, dwBytes, uFlags);
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}
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HGLOBAL rv = Perftools_GlobalAlloc(uFlags, dwBytes);
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if (hMem != 0) {
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size_t size = GlobalSize(hMem);
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if (size > dwBytes)
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size = dwBytes;
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// Note: size could be 0; HeapAlloc does allocate 0 length buffers.
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memcpy(rv, hMem, size);
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Perftools_GlobalFree(hMem);
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}
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return rv;
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}
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static HLOCAL WINAPI Perftools_LocalAlloc(UINT uFlags, SIZE_T dwBytes) {
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// LocalAlloc is built atop HeapAlloc anyway. So we don't track these.
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// LocalAlloc will internally call into HeapAlloc and we track there.
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// Force all memory to be fixed.
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uFlags &= ~LMEM_MOVEABLE;
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HLOCAL rv = patch_LocalAlloc()(uFlags, dwBytes);
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return rv;
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}
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static HLOCAL WINAPI Perftools_LocalFree(HLOCAL hMem) {
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return patch_LocalFree()(hMem);
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}
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static HLOCAL WINAPI Perftools_LocalReAlloc(HLOCAL hMem, SIZE_T dwBytes,
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UINT uFlags) {
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// LocalDiscard is a macro which calls LocalReAlloc with size 0.
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if (dwBytes == 0) {
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return patch_LocalReAlloc()(hMem, dwBytes, uFlags);
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}
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HGLOBAL rv = Perftools_LocalAlloc(uFlags, dwBytes);
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if (hMem != 0) {
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size_t size = LocalSize(hMem);
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if (size > dwBytes)
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size = dwBytes;
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// Note: size could be 0; HeapAlloc does allocate 0 length buffers.
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memcpy(rv, hMem, size);
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Perftools_LocalFree(hMem);
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}
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return rv;
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}
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bool MemoryHook::hooked_ = false;
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MemoryHook* MemoryHook::global_hook_ = NULL;
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MemoryHook::MemoryHook()
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: watcher_(NULL),
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heap_(NULL) {
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CreateHeap();
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}
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MemoryHook::~MemoryHook() {
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// It's a bit dangerous to ever close this heap; MemoryWatchers may have
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// used this heap for their tracking data. Closing the heap while any
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// MemoryWatchers still exist is pretty dangerous.
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CloseHeap();
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}
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bool MemoryHook::Initialize() {
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if (global_hook_ == NULL)
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global_hook_ = new MemoryHook();
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return true;
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}
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bool MemoryHook::Hook() {
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DCHECK(!hooked_);
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if (!hooked_) {
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DCHECK(global_hook_);
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// Luckily, Patch() doesn't call malloc or windows alloc routines
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// itself -- though it does call new (we can use PatchWithStub to
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// get around that, and will need to if we need to patch new).
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HMODULE hkernel32 = ::GetModuleHandle(L"kernel32");
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CHECK(hkernel32 != NULL);
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HMODULE hntdll = ::GetModuleHandle(L"ntdll");
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CHECK(hntdll != NULL);
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// Now that we've found all the functions, patch them
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INSTALL_PATCH(HeapCreate);
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INSTALL_PATCH(HeapDestroy);
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INSTALL_PATCH(HeapAlloc);
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INSTALL_PATCH(HeapReAlloc);
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INSTALL_PATCH(HeapFree);
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INSTALL_PATCH(VirtualAllocEx);
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INSTALL_PATCH(VirtualFreeEx);
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INSTALL_PATCH(MapViewOfFileEx);
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INSTALL_PATCH(MapViewOfFile);
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INSTALL_PATCH(UnmapViewOfFile);
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INSTALL_NTDLLPATCH(NtUnmapViewOfSection);
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INSTALL_PATCH(GlobalAlloc);
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INSTALL_PATCH(GlobalReAlloc);
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INSTALL_PATCH(GlobalFree);
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INSTALL_PATCH(LocalAlloc);
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INSTALL_PATCH(LocalReAlloc);
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INSTALL_PATCH(LocalFree);
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// We are finally completely hooked.
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hooked_ = true;
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}
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return true;
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}
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bool MemoryHook::Unhook() {
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if (hooked_) {
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// We need to go back to the system malloc/etc at global destruct time,
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// so objects that were constructed before tcmalloc, using the system
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// malloc, can destroy themselves using the system free. This depends
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// on DLLs unloading in the reverse order in which they load!
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//
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// We also go back to the default HeapAlloc/etc, just for consistency.
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// Who knows, it may help avoid weird bugs in some situations.
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UNINSTALL_PATCH(HeapCreate);
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UNINSTALL_PATCH(HeapDestroy);
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UNINSTALL_PATCH(HeapAlloc);
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UNINSTALL_PATCH(HeapReAlloc);
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UNINSTALL_PATCH(HeapFree);
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UNINSTALL_PATCH(VirtualAllocEx);
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UNINSTALL_PATCH(VirtualFreeEx);
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UNINSTALL_PATCH(MapViewOfFile);
|
|
UNINSTALL_PATCH(MapViewOfFileEx);
|
|
UNINSTALL_PATCH(UnmapViewOfFile);
|
|
UNINSTALL_PATCH(NtUnmapViewOfSection);
|
|
UNINSTALL_PATCH(GlobalAlloc);
|
|
UNINSTALL_PATCH(GlobalReAlloc);
|
|
UNINSTALL_PATCH(GlobalFree);
|
|
UNINSTALL_PATCH(LocalAlloc);
|
|
UNINSTALL_PATCH(LocalReAlloc);
|
|
UNINSTALL_PATCH(LocalFree);
|
|
|
|
hooked_ = false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool MemoryHook::RegisterWatcher(MemoryObserver* watcher) {
|
|
DCHECK(global_hook_->watcher_ == NULL);
|
|
|
|
if (!hooked_)
|
|
Hook();
|
|
|
|
DCHECK(global_hook_);
|
|
global_hook_->watcher_ = watcher;
|
|
return true;
|
|
}
|
|
|
|
bool MemoryHook::UnregisterWatcher(MemoryObserver* watcher) {
|
|
DCHECK(hooked_);
|
|
DCHECK(global_hook_->watcher_ == watcher);
|
|
// TODO(jar): changing watcher_ here is very racy. Other threads may (without
|
|
// a lock) testing, and then calling through this value. We probably can't
|
|
// remove this until we are single threaded.
|
|
global_hook_->watcher_ = NULL;
|
|
|
|
// For now, since there are no more watchers, unhook memory.
|
|
return Unhook();
|
|
}
|
|
|
|
bool MemoryHook::CreateHeap() {
|
|
// Create a heap for our own memory.
|
|
DCHECK(heap_ == NULL);
|
|
heap_ = HeapCreate(0, 0, 0);
|
|
DCHECK(heap_ != NULL);
|
|
return heap_ != NULL;
|
|
}
|
|
|
|
bool MemoryHook::CloseHeap() {
|
|
DCHECK(heap_ != NULL);
|
|
HeapDestroy(heap_);
|
|
heap_ = NULL;
|
|
return true;
|
|
}
|
|
|
|
void MemoryHook::OnTrack(HANDLE heap, int32 id, int32 size) {
|
|
// Don't notify about allocations to our internal heap.
|
|
if (heap == heap_)
|
|
return;
|
|
|
|
if (watcher_)
|
|
watcher_->OnTrack(heap, id, size);
|
|
}
|
|
|
|
void MemoryHook::OnUntrack(HANDLE heap, int32 id, int32 size) {
|
|
// Don't notify about allocations to our internal heap.
|
|
if (heap == heap_)
|
|
return;
|
|
|
|
if (watcher_)
|
|
watcher_->OnUntrack(heap, id, size);
|
|
}
|