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.
30INTERCEPT_WRAP_V_W(free)
31INTERCEPT_WRAP_V_W(_free_base)
32INTERCEPT_WRAP_V_WW(_free_dbg)
33
34INTERCEPT_WRAP_W_W(malloc)
35INTERCEPT_WRAP_W_W(_malloc_base)
36INTERCEPT_WRAP_W_WWWW(_malloc_dbg)
37
38INTERCEPT_WRAP_W_WW(calloc)
39INTERCEPT_WRAP_W_WW(_calloc_base)
40INTERCEPT_WRAP_W_WWWWW(_calloc_dbg)
41INTERCEPT_WRAP_W_WWW(_calloc_impl)
42
43INTERCEPT_WRAP_W_WW(realloc)
44INTERCEPT_WRAP_W_WW(_realloc_base)
45INTERCEPT_WRAP_W_WWW(_realloc_dbg)
46INTERCEPT_WRAP_W_WWW(_recalloc)
47INTERCEPT_WRAP_W_WWW(_recalloc_base)
48
49INTERCEPT_WRAP_W_W(_msize)
50INTERCEPT_WRAP_W_W(_msize_base)
51INTERCEPT_WRAP_W_W(_expand)
52INTERCEPT_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
59INTERCEPT_LIBRARY_FUNCTION(atoi);
60INTERCEPT_LIBRARY_FUNCTION(atol);
61INTERCEPT_LIBRARY_FUNCTION(frexp);
62INTERCEPT_LIBRARY_FUNCTION(longjmp);
63#if SANITIZER_INTERCEPT_MEMCHR
64INTERCEPT_LIBRARY_FUNCTION(memchr);
65#endif
66INTERCEPT_LIBRARY_FUNCTION(memcmp);
67INTERCEPT_LIBRARY_FUNCTION(memcpy);
68INTERCEPT_LIBRARY_FUNCTION(memmove);
69INTERCEPT_LIBRARY_FUNCTION(memset);
70INTERCEPT_LIBRARY_FUNCTION(strcat);
71INTERCEPT_LIBRARY_FUNCTION(strchr);
72INTERCEPT_LIBRARY_FUNCTION(strcmp);
73INTERCEPT_LIBRARY_FUNCTION(strcpy);
74INTERCEPT_LIBRARY_FUNCTION(strcspn);
75INTERCEPT_LIBRARY_FUNCTION(strdup);
76INTERCEPT_LIBRARY_FUNCTION(strlen);
77INTERCEPT_LIBRARY_FUNCTION(strncat);
78INTERCEPT_LIBRARY_FUNCTION(strncmp);
79INTERCEPT_LIBRARY_FUNCTION(strncpy);
80INTERCEPT_LIBRARY_FUNCTION(strnlen);
81INTERCEPT_LIBRARY_FUNCTION(strpbrk);
82INTERCEPT_LIBRARY_FUNCTION(strrchr);
83INTERCEPT_LIBRARY_FUNCTION(strspn);
84INTERCEPT_LIBRARY_FUNCTION(strstr);
85INTERCEPT_LIBRARY_FUNCTION(strtok);
86INTERCEPT_LIBRARY_FUNCTION(strtol);
87INTERCEPT_LIBRARY_FUNCTION(wcslen);
88INTERCEPT_LIBRARY_FUNCTION(wcsnlen);
89
90#ifdef _WIN64
91INTERCEPT_LIBRARY_FUNCTION(__C_specific_handler);
92#else
93INTERCEPT_LIBRARY_FUNCTION(_except_handler3);
94// _except_handler4 checks -GS cookie which is different for each module, so we
95// can't use INTERCEPT_LIBRARY_FUNCTION(_except_handler4).
96INTERCEPTOR(int, _except_handler4, void *a, void *b, void *c, void *d) {
97  __asan_handle_no_return();
98  return REAL(_except_handler4)(a, b, c, d);
99}
100#endif
101
102// Windows specific functions not included in asan_interface.inc.
103INTERCEPT_WRAP_W_V(__asan_should_detect_stack_use_after_return)
104INTERCEPT_WRAP_W_V(__asan_get_shadow_memory_dynamic_address)
105INTERCEPT_WRAP_W_W(__asan_unhandled_exception_filter)
106
107using namespace __sanitizer;
108
109extern "C" {
110int __asan_option_detect_stack_use_after_return;
111uptr __asan_shadow_memory_dynamic_address;
112} // extern "C"
113
114static int asan_dll_thunk_init() {
115  typedef void (*fntype)();
116  static fntype fn = 0;
117  // asan_dll_thunk_init is expected to be called by only one thread.
118  if (fn) return 0;
119
120  // Ensure all interception was executed.
121  __dll_thunk_init();
122
123  fn = (fntype) dllThunkGetRealAddrOrDie("__asan_init");
124  fn();
125  __asan_option_detect_stack_use_after_return =
126      (__asan_should_detect_stack_use_after_return() != 0);
127  __asan_shadow_memory_dynamic_address =
128      (uptr)__asan_get_shadow_memory_dynamic_address();
129
130#ifndef _WIN64
131  INTERCEPT_FUNCTION(_except_handler4);
132#endif
133  // In DLLs, the callbacks are expected to return 0,
134  // otherwise CRT initialization fails.
135  return 0;
136}
137
138#pragma section(".CRT$XIB", long, read)
139__declspec(allocate(".CRT$XIB")) int (*__asan_preinit)() = asan_dll_thunk_init;
140
141static void WINAPI asan_thread_init(void *mod, unsigned long reason,
142                                    void *reserved) {
143  if (reason == /*DLL_PROCESS_ATTACH=*/1) asan_dll_thunk_init();
144}
145
146#pragma section(".CRT$XLAB", long, read)
147__declspec(allocate(".CRT$XLAB")) void (WINAPI *__asan_tls_init)(void *,
148    unsigned long, void *) = asan_thread_init;
149
150WIN_FORCE_LINK(__asan_dso_reg_hook)
151
152#endif // SANITIZER_DLL_THUNK
153