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..e62bd97ef4e34bb732f695ea59391dc486c9f7ca |
--- /dev/null |
+++ b/syzygy/integration_tests/allocator_shim.cc |
@@ -0,0 +1,120 @@ |
+// 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 { |
+ |
+// The following typedefs are function pointers for the functions: |
+// heap_create, heap_destroy, heap_alloc, heap_realloc, and heap_free |
+// from the ucrt library that we are overwritting with syzyasan_rtl.dll. |
Sébastien Marchand
2017/07/25 20:07:07
That's not true, these functions are heap pointers
njanevsk
2017/07/26 16:23:45
Done.
|
+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); |
+ |
+struct AsanRuntimePointers { |
+ HANDLE asan_heap = nullptr; |
+ HMODULE asan_module = nullptr; |
+ HeapCreatePtr heap_create = nullptr; |
+ HeapAllocPtr heap_alloc = nullptr; |
+ HeapFreePtr heap_free = nullptr; |
+ HeapReAllocPtr heap_realloc = nullptr; |
+}; |
+ |
+AsanRuntimePointers asan_runtime_ptrs; |
+ |
+void resolve_asan_runtime_pointers() { |
Sébastien Marchand
2017/07/25 20:07:07
CamelCase.
njanevsk
2017/07/26 16:23:45
Done.
|
+ if (asan_shim.asan_module == nullptr) { |
+ asan_shim.asan_module = GetModuleHandle(L"syzyasan_rtl.dll"); |
+ asan_shim.heap_create = reinterpret_cast<HeapCreatePtr>( |
+ ::GetProcAddress(asan_shim.asan_module, "asan_HeapCreate")); |
+ asan_shim.heap_alloc = reinterpret_cast<HeapAllocPtr>( |
+ ::GetProcAddress(asan_shim.asan_module, "asan_HeapAlloc")); |
+ asan_shim.heap_free = reinterpret_cast<HeapFreePtr>( |
+ ::GetProcAddress(asan_shim.asan_module, "asan_HeapFree")); |
+ asan_shim.heap_realloc = reinterpret_cast<HeapReAllocPtr>( |
+ ::GetProcAddress(asan_shim.asan_module, "asan_HeapReAlloc")); |
+ } |
+} |
+ |
+inline HANDLE get_heap_handle() { |
+ resolve_asan_runtime_pointers(); |
+ return asan_shim.asan_heap; |
+} |
+ |
+} // namespace |
+ |
+// This function behaves similarly to MSVC's _set_new_mode. |
+// If flag is 0 (default), calls to malloc will behave normally. |
+// If flag is 1, calls to malloc will behave like calls to new, |
+// and the std_new_handler will be invoked on failure. |
+// Returns the previous mode. |
+// |
+// Replaces _set_new_mode in ucrt\heap\new_mode.cpp |
+int _set_new_mode(int flag) { |
+ return 0; |
+} |
+ |
+// Replaces _query_new_mode in ucrt\heap\new_mode.cpp |
+int _query_new_mode() { |
+ return 0; |
+} |
+ |
+// These symbols override the CRT's implementation of the same functions. |
+__declspec(restrict) void* malloc(size_t size) { |
+ resolve_asan_runtime_pointers(); |
Sébastien Marchand
2017/07/25 20:07:07
I don't really like having these calls in every fu
njanevsk
2017/07/26 16:23:45
Done.
|
+ return asan_shim.heap_alloc(get_heap_handle(), 0, size); |
+} |
+ |
+void free(void* ptr) { |
+ resolve_asan_runtime_pointers(); |
+ asan_shim.heap_free(get_heap_handle(), 0, ptr); |
+} |
+ |
+__declspec(restrict) void* realloc(void* ptr, size_t size) { |
+ resolve_asan_runtime_pointers(); |
+ return asan_shim.heap_realloc(get_heap_handle(), 0, ptr, size); |
+} |
+ |
+__declspec(restrict) void* calloc(size_t n, size_t size) { |
+ resolve_asan_runtime_pointers(); |
+ 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() { |
+ __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" |