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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 // This file defines symbols to override the same functions in the Visual C++ | |
6 // CRT implementation. | |
7 | |
8 #include <windows.h> | |
9 #include <malloc.h> | |
10 | |
11 extern "C" { | |
12 | |
13 namespace { | |
14 | |
15 // Definitions of the following heap management functions provided by | |
16 // the SyzyAsan library: | |
17 // heap_create, heap_destroy, heap_alloc, heap_realloc, and heap_free. | |
18 typedef HANDLE(WINAPI* HeapCreatePtr)(DWORD, SIZE_T, SIZE_T); | |
19 typedef BOOL(WINAPI* HeapDestroyPtr)(HANDLE); | |
20 typedef LPVOID(WINAPI* HeapAllocPtr)(HANDLE, DWORD, SIZE_T); | |
21 typedef LPVOID(WINAPI* HeapReAllocPtr)(HANDLE, DWORD, LPVOID, SIZE_T); | |
22 typedef BOOL(WINAPI* HeapFreePtr)(HANDLE, DWORD, LPVOID); | |
23 typedef BOOL(WINAPI* HeapDestroyPtr)(HANDLE); | |
24 | |
25 struct AsanRuntimePointers { | |
26 AsanRuntimePointers() { | |
27 // It retrieves the handle for the syzyasan_rtl.dll module | |
28 // and the heap functions that it provides. | |
29 if (asan_runtime.asan_module == nullptr) { | |
30 asan_runtime.asan_module = GetModuleHandle(L"syzyasan_rtl.dll"); | |
31 if (asan_runtime.asan_module != nullptr) { | |
32 asan_runtime.heap_create = reinterpret_cast<HeapCreatePtr>( | |
33 ::GetProcAddress(asan_runtime.asan_module, "asan_HeapCreate")); | |
34 asan_runtime.heap_alloc = reinterpret_cast<HeapAllocPtr>( | |
35 ::GetProcAddress(asan_runtime.asan_module, "asan_HeapAlloc")); | |
36 asan_runtime.heap_free = reinterpret_cast<HeapFreePtr>( | |
37 ::GetProcAddress(asan_runtime.asan_module, "asan_HeapFree")); | |
38 asan_runtime.heap_realloc = reinterpret_cast<HeapReAllocPtr>( | |
39 ::GetProcAddress(asan_runtime.asan_module, "asan_HeapReAlloc")); | |
40 asan_runtime.heap_destroy = reinterpret_cast<HeapDestroyPtr>( | |
41 ::GetProcAddress(asan_runtime.asan_module, "asan_HeapDestroy")); | |
42 asan_runtime.asan_heap = asan_runtime.heap_create(0, 0, 0); | |
43 } | |
44 } | |
45 }; | |
46 | |
47 HANDLE asan_heap = nullptr; | |
48 HMODULE asan_module = nullptr; | |
49 HeapCreatePtr heap_create = nullptr; | |
50 HeapAllocPtr heap_alloc = nullptr; | |
51 HeapFreePtr heap_free = nullptr; | |
52 HeapReAllocPtr heap_realloc = nullptr; | |
53 HeapDestroyPtr heap_destroy = nullptr; | |
54 static AsanRuntimePointers asan_runtime; | |
Sébastien Marchand
2017/08/08 18:12:32
static goes before the non static members.
njanevsk
2017/08/08 19:24:20
Done.
| |
55 }; | |
56 | |
57 // The no_sanitize_address attribute is needed to prevent instrumentation | |
58 // cause that requireds additional methods from asan that are not supported | |
Sébastien Marchand
2017/08/08 18:12:32
s/cause/because/
s/requireds/requires/
s/asan/Asan
njanevsk
2017/08/08 19:24:20
Done.
| |
59 // in the syzyasan runtime library. | |
Sébastien Marchand
2017/08/08 18:12:32
s/syzyasan/SyzyAsan/
njanevsk
2017/08/08 19:24:20
Done.
| |
60 AsanRuntimePointers | |
61 __attribute__((no_sanitize_address)) AsanRuntimePointers::asan_runtime; | |
62 | |
63 inline HANDLE get_heap_handle() { | |
64 return AsanRuntimePointers::asan_runtime.asan_heap; | |
65 } | |
66 | |
67 } // namespace | |
68 | |
69 // These symbols override the CRT's implementation of the same functions. | |
70 __declspec(restrict) void* malloc(size_t size) { | |
71 return AsanRuntimePointers::asan_runtime.heap_alloc(get_heap_handle(), 0, | |
72 size); | |
73 } | |
74 | |
75 void free(void* ptr) { | |
76 AsanRuntimePointers::asan_runtime.heap_free(get_heap_handle(), 0, ptr); | |
77 } | |
78 | |
79 __declspec(restrict) void* realloc(void* ptr, size_t size) { | |
80 return AsanRuntimePointers::asan_runtime.heap_realloc(get_heap_handle(), 0, | |
81 ptr, size); | |
82 } | |
83 | |
84 __declspec(restrict) void* calloc(size_t n, size_t size) { | |
85 void* ptr = malloc(size * n); | |
86 if (ptr != nullptr) | |
87 ::memset(ptr, 0, size * n); | |
88 return ptr; | |
89 } | |
90 | |
91 // The symbols | |
92 // * __acrt_heap | |
93 // * __acrt_initialize_heap | |
94 // * __acrt_uninitialize_heap | |
95 // * _get_heap_handle | |
96 // must be overridden all or none, as they are otherwise supplied | |
97 // by heap_handle.obj in the ucrt.lib file. | |
98 HANDLE __acrt_heap = nullptr; | |
99 | |
100 bool __acrt_initialize_heap() { | |
101 // The core CRT functions don't use the CRT's memory management | |
102 // functions, instead they directly use |__acrt_heap| and calls the | |
103 // ::Heap* functions. Because of this it's not possible to replace this | |
104 // heap by an Asan one. | |
105 __acrt_heap = ::HeapCreate(0, 0, 0); | |
106 return true; | |
107 } | |
108 | |
109 bool __acrt_uninitialize_heap() { | |
110 ::HeapDestroy(__acrt_heap); | |
111 __acrt_heap = nullptr; | |
112 return true; | |
113 } | |
114 | |
115 intptr_t _get_heap_handle(void) { | |
116 return reinterpret_cast<intptr_t>(__acrt_heap); | |
117 } | |
118 | |
119 } // extern "C" | |
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