Index: syzygy/integration_tests/allocator_shim.cc |
diff --git a/syzygy/integration_tests/allocator_shim.cc b/syzygy/integration_tests/allocator_shim.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..f057e8b99b18c446487ab444207a1e6dd76dd515 |
--- /dev/null |
+++ b/syzygy/integration_tests/allocator_shim.cc |
@@ -0,0 +1,119 @@ |
+// Copyright 2017 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. |
+ |
+// This file defines symbols to override the same functions in the Visual C++ |
+// CRT implementation. |
+ |
+#include <windows.h> |
+#include <malloc.h> |
+ |
+extern "C" { |
+ |
+namespace { |
+ |
+// Definitions of the following heap management functions provided by |
+// the SyzyAsan library: |
+// heap_create, heap_destroy, heap_alloc, heap_realloc, and heap_free. |
+typedef HANDLE(WINAPI* HeapCreatePtr)(DWORD, SIZE_T, SIZE_T); |
+typedef BOOL(WINAPI* HeapDestroyPtr)(HANDLE); |
+typedef LPVOID(WINAPI* HeapAllocPtr)(HANDLE, DWORD, SIZE_T); |
+typedef LPVOID(WINAPI* HeapReAllocPtr)(HANDLE, DWORD, LPVOID, SIZE_T); |
+typedef BOOL(WINAPI* HeapFreePtr)(HANDLE, DWORD, LPVOID); |
+typedef BOOL(WINAPI* HeapDestroyPtr)(HANDLE); |
+ |
+struct AsanRuntimePointers { |
+ AsanRuntimePointers() { |
+ // It retrieves the handle for the syzyasan_rtl.dll module |
+ // and the heap functions that it provides. |
+ if (asan_runtime.asan_module == nullptr) { |
+ asan_runtime.asan_module = GetModuleHandle(L"syzyasan_rtl.dll"); |
+ if (asan_runtime.asan_module != nullptr) { |
+ asan_runtime.heap_create = reinterpret_cast<HeapCreatePtr>( |
+ ::GetProcAddress(asan_runtime.asan_module, "asan_HeapCreate")); |
+ asan_runtime.heap_alloc = reinterpret_cast<HeapAllocPtr>( |
+ ::GetProcAddress(asan_runtime.asan_module, "asan_HeapAlloc")); |
+ asan_runtime.heap_free = reinterpret_cast<HeapFreePtr>( |
+ ::GetProcAddress(asan_runtime.asan_module, "asan_HeapFree")); |
+ asan_runtime.heap_realloc = reinterpret_cast<HeapReAllocPtr>( |
+ ::GetProcAddress(asan_runtime.asan_module, "asan_HeapReAlloc")); |
+ asan_runtime.heap_destroy = reinterpret_cast<HeapDestroyPtr>( |
+ ::GetProcAddress(asan_runtime.asan_module, "asan_HeapDestroy")); |
+ asan_runtime.asan_heap = asan_runtime.heap_create(0, 0, 0); |
+ } |
+ } |
+ }; |
+ |
+ static AsanRuntimePointers asan_runtime; |
+ HANDLE asan_heap = nullptr; |
+ HMODULE asan_module = nullptr; |
+ HeapCreatePtr heap_create = nullptr; |
+ HeapAllocPtr heap_alloc = nullptr; |
+ HeapFreePtr heap_free = nullptr; |
+ HeapReAllocPtr heap_realloc = nullptr; |
+ HeapDestroyPtr heap_destroy = nullptr; |
+}; |
+ |
+// The no_sanitize_address attribute is needed to prevent instrumentation |
+// because that requires additional methods from Asan that are not supported |
+// in the SyzyAsan runtime library. |
+AsanRuntimePointers |
+ __attribute__((no_sanitize_address)) AsanRuntimePointers::asan_runtime; |
+ |
+inline HANDLE get_heap_handle() { |
+ return AsanRuntimePointers::asan_runtime.asan_heap; |
+} |
+ |
+} // namespace |
+ |
+// These symbols override the CRT's implementation of the same functions. |
+__declspec(restrict) void* malloc(size_t size) { |
+ return AsanRuntimePointers::asan_runtime.heap_alloc(get_heap_handle(), 0, |
+ size); |
+} |
+ |
+void free(void* ptr) { |
+ AsanRuntimePointers::asan_runtime.heap_free(get_heap_handle(), 0, ptr); |
+} |
+ |
+__declspec(restrict) void* realloc(void* ptr, size_t size) { |
+ return AsanRuntimePointers::asan_runtime.heap_realloc(get_heap_handle(), 0, |
+ ptr, size); |
+} |
+ |
+__declspec(restrict) void* calloc(size_t n, size_t size) { |
+ void* ptr = malloc(size * n); |
+ if (ptr != nullptr) |
+ ::memset(ptr, 0, size * n); |
+ return ptr; |
+} |
+ |
+// The symbols |
+// * __acrt_heap |
+// * __acrt_initialize_heap |
+// * __acrt_uninitialize_heap |
+// * _get_heap_handle |
+// must be overridden all or none, as they are otherwise supplied |
+// by heap_handle.obj in the ucrt.lib file. |
+HANDLE __acrt_heap = nullptr; |
+ |
+bool __acrt_initialize_heap() { |
+ // The core CRT functions don't use the CRT's memory management |
+ // functions, instead they directly use |__acrt_heap| and calls the |
+ // ::Heap* functions. Because of this it's not possible to replace this |
+ // heap by an Asan one. |
+ __acrt_heap = ::HeapCreate(0, 0, 0); |
+ return true; |
+} |
+ |
+bool __acrt_uninitialize_heap() { |
+ ::HeapDestroy(__acrt_heap); |
+ __acrt_heap = nullptr; |
+ return true; |
+} |
+ |
+intptr_t _get_heap_handle(void) { |
+ return reinterpret_cast<intptr_t>(__acrt_heap); |
+} |
+ |
+} // extern "C" |