1 //===-- asan_win_dll_thunk.cpp --------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of AddressSanitizer, an address sanity checker.
10 //
11 // This file defines a family of thunks that should be statically linked into
12 // the DLLs that have ASan instrumentation in order to delegate the calls to the
13 // shared runtime that lives in the main binary.
14 // See https://github.com/google/sanitizers/issues/209 for the details.
15 //===----------------------------------------------------------------------===//
16
17 #ifdef SANITIZER_DLL_THUNK
18 #include "asan_init_version.h"
19 #include "interception/interception.h"
20 #include "sanitizer_common/sanitizer_win_defs.h"
21 #include "sanitizer_common/sanitizer_win_dll_thunk.h"
22 #include "sanitizer_common/sanitizer_platform_interceptors.h"
23
24 // ASan own interface functions.
25 #define INTERFACE_FUNCTION(Name) INTERCEPT_SANITIZER_FUNCTION(Name)
26 #define INTERFACE_WEAK_FUNCTION(Name) INTERCEPT_SANITIZER_WEAK_FUNCTION(Name)
27 #include "asan_interface.inc"
28
29 // Memory allocation functions.
30 INTERCEPT_WRAP_V_W(free)
31 INTERCEPT_WRAP_V_W(_free_base)
32 INTERCEPT_WRAP_V_WW(_free_dbg)
33
34 INTERCEPT_WRAP_W_W(malloc)
35 INTERCEPT_WRAP_W_W(_malloc_base)
36 INTERCEPT_WRAP_W_WWWW(_malloc_dbg)
37
38 INTERCEPT_WRAP_W_WW(calloc)
39 INTERCEPT_WRAP_W_WW(_calloc_base)
40 INTERCEPT_WRAP_W_WWWWW(_calloc_dbg)
41 INTERCEPT_WRAP_W_WWW(_calloc_impl)
42
43 INTERCEPT_WRAP_W_WW(realloc)
44 INTERCEPT_WRAP_W_WW(_realloc_base)
45 INTERCEPT_WRAP_W_WWW(_realloc_dbg)
46 INTERCEPT_WRAP_W_WWW(_recalloc)
47 INTERCEPT_WRAP_W_WWW(_recalloc_base)
48
49 INTERCEPT_WRAP_W_W(_msize)
50 INTERCEPT_WRAP_W_W(_msize_base)
51 INTERCEPT_WRAP_W_W(_expand)
52 INTERCEPT_WRAP_W_W(_expand_dbg)
53
54 // TODO(timurrrr): Might want to add support for _aligned_* allocation
55 // functions to detect a bit more bugs. Those functions seem to wrap malloc().
56
57 // TODO(timurrrr): Do we need to add _Crt* stuff here? (see asan_malloc_win.cpp)
58
59 # if defined(_MSC_VER) && !defined(__clang__)
60 // Disable warnings such as: 'void memchr(void)': incorrect number of arguments
61 // for intrinsic function, expected '3' arguments.
62 # pragma warning(push)
63 # pragma warning(disable : 4392)
64 # endif
65
66 INTERCEPT_LIBRARY_FUNCTION(atoi);
67 INTERCEPT_LIBRARY_FUNCTION(atol);
68 INTERCEPT_LIBRARY_FUNCTION(atoll);
69 INTERCEPT_LIBRARY_FUNCTION(frexp);
70 INTERCEPT_LIBRARY_FUNCTION(longjmp);
71 #if SANITIZER_INTERCEPT_MEMCHR
72 INTERCEPT_LIBRARY_FUNCTION(memchr);
73 #endif
74 INTERCEPT_LIBRARY_FUNCTION(memcmp);
75 INTERCEPT_LIBRARY_FUNCTION(memcpy);
76 INTERCEPT_LIBRARY_FUNCTION(memmove);
77 INTERCEPT_LIBRARY_FUNCTION(memset);
78 INTERCEPT_LIBRARY_FUNCTION(strcat);
79 INTERCEPT_LIBRARY_FUNCTION(strchr);
80 INTERCEPT_LIBRARY_FUNCTION(strcmp);
81 INTERCEPT_LIBRARY_FUNCTION(strcpy);
82 INTERCEPT_LIBRARY_FUNCTION(strcspn);
83 INTERCEPT_LIBRARY_FUNCTION(_strdup);
84 INTERCEPT_LIBRARY_FUNCTION(strlen);
85 INTERCEPT_LIBRARY_FUNCTION(strncat);
86 INTERCEPT_LIBRARY_FUNCTION(strncmp);
87 INTERCEPT_LIBRARY_FUNCTION(strncpy);
88 INTERCEPT_LIBRARY_FUNCTION(strnlen);
89 INTERCEPT_LIBRARY_FUNCTION(strpbrk);
90 INTERCEPT_LIBRARY_FUNCTION(strrchr);
91 INTERCEPT_LIBRARY_FUNCTION(strspn);
92 INTERCEPT_LIBRARY_FUNCTION(strstr);
93 INTERCEPT_LIBRARY_FUNCTION(strtok);
94 INTERCEPT_LIBRARY_FUNCTION(strtol);
95 INTERCEPT_LIBRARY_FUNCTION(strtoll);
96 INTERCEPT_LIBRARY_FUNCTION(wcslen);
97 INTERCEPT_LIBRARY_FUNCTION(wcsnlen);
98
99 # if defined(_MSC_VER) && !defined(__clang__)
100 # pragma warning(pop)
101 # endif
102
103 #ifdef _WIN64
104 INTERCEPT_LIBRARY_FUNCTION(__C_specific_handler);
105 #else
106 INTERCEPT_LIBRARY_FUNCTION(_except_handler3);
107 // _except_handler4 checks -GS cookie which is different for each module, so we
108 // can't use INTERCEPT_LIBRARY_FUNCTION(_except_handler4).
INTERCEPTOR(int,_except_handler4,void * a,void * b,void * c,void * d)109 INTERCEPTOR(int, _except_handler4, void *a, void *b, void *c, void *d) {
110 __asan_handle_no_return();
111 return REAL(_except_handler4)(a, b, c, d);
112 }
113 #endif
114
115 // Windows specific functions not included in asan_interface.inc.
116 INTERCEPT_WRAP_W_V(__asan_should_detect_stack_use_after_return)
117 INTERCEPT_WRAP_W_V(__asan_get_shadow_memory_dynamic_address)
118 INTERCEPT_WRAP_W_W(__asan_unhandled_exception_filter)
119
120 using namespace __sanitizer;
121
122 extern "C" {
123 int __asan_option_detect_stack_use_after_return;
124 uptr __asan_shadow_memory_dynamic_address;
125 } // extern "C"
126
asan_dll_thunk_init()127 static int asan_dll_thunk_init() {
128 typedef void (*fntype)();
129 static fntype fn = 0;
130 // asan_dll_thunk_init is expected to be called by only one thread.
131 if (fn) return 0;
132
133 // Ensure all interception was executed.
134 __dll_thunk_init();
135
136 fn = (fntype) dllThunkGetRealAddrOrDie("__asan_init");
137 fn();
138 __asan_option_detect_stack_use_after_return =
139 (__asan_should_detect_stack_use_after_return() != 0);
140 __asan_shadow_memory_dynamic_address =
141 (uptr)__asan_get_shadow_memory_dynamic_address();
142
143 #ifndef _WIN64
144 INTERCEPT_FUNCTION(_except_handler4);
145 #endif
146 // In DLLs, the callbacks are expected to return 0,
147 // otherwise CRT initialization fails.
148 return 0;
149 }
150
151 #pragma section(".CRT$XIB", long, read)
152 __declspec(allocate(".CRT$XIB")) int (*__asan_preinit)() = asan_dll_thunk_init;
153
asan_thread_init(void * mod,unsigned long reason,void * reserved)154 static void WINAPI asan_thread_init(void *mod, unsigned long reason,
155 void *reserved) {
156 if (reason == /*DLL_PROCESS_ATTACH=*/1) asan_dll_thunk_init();
157 }
158
159 #pragma section(".CRT$XLAB", long, read)
160 __declspec(allocate(".CRT$XLAB")) void (WINAPI *__asan_tls_init)(void *,
161 unsigned long, void *) = asan_thread_init;
162
163 WIN_FORCE_LINK(__asan_dso_reg_hook)
164
165 #endif // SANITIZER_DLL_THUNK
166