1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
//===-- sanitizer_win_dll_thunk.h -----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// This header provide helper macros to delegate calls to the shared runtime
// that lives in the main executable. It should be included to dll_thunks that
// will be linked to the dlls, when the sanitizer is a static library included
// in the main executable.
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_WIN_DLL_THUNK_H
#define SANITIZER_WIN_DLL_THUNK_H
#include "sanitizer_internal_defs.h"
namespace __sanitizer {
uptr dllThunkGetRealAddrOrDie(const char *name);
int dllThunkIntercept(const char* main_function, uptr dll_function);
int dllThunkInterceptWhenPossible(const char* main_function,
const char* default_function, uptr dll_function);
}
extern "C" int __dll_thunk_init();
// ----------------- Function interception helper macros -------------------- //
// Override dll_function with main_function from main executable.
#define INTERCEPT_OR_DIE(main_function, dll_function) \
static int intercept_##dll_function() { \
return __sanitizer::dllThunkIntercept(main_function, (__sanitizer::uptr) \
dll_function); \
} \
__pragma(section(".DLLTH$M", long, read)) \
__declspec(allocate(".DLLTH$M")) int (*__dll_thunk_##dll_function)() = \
intercept_##dll_function;
// Try to override dll_function with main_function from main executable.
// If main_function is not present, override dll_function with default_function.
#define INTERCEPT_WHEN_POSSIBLE(main_function, default_function, dll_function) \
static int intercept_##dll_function() { \
return __sanitizer::dllThunkInterceptWhenPossible(main_function, \
default_function, (__sanitizer::uptr)dll_function); \
} \
__pragma(section(".DLLTH$M", long, read)) \
__declspec(allocate(".DLLTH$M")) int (*__dll_thunk_##dll_function)() = \
intercept_##dll_function;
// -------------------- Function interception macros ------------------------ //
// Special case of hooks -- ASan own interface functions. Those are only called
// after __asan_init, thus an empty implementation is sufficient.
#define INTERCEPT_SANITIZER_FUNCTION(name) \
extern "C" __declspec(noinline) void name() { \
volatile int prevent_icf = (__LINE__ << 8) ^ __COUNTER__; \
static const char function_name[] = #name; \
for (const char* ptr = &function_name[0]; *ptr; ++ptr) \
prevent_icf ^= *ptr; \
(void)prevent_icf; \
__debugbreak(); \
} \
INTERCEPT_OR_DIE(#name, name)
// Special case of hooks -- Weak functions, could be redefined in the main
// executable, but that is not necessary, so we shouldn't die if we can not find
// a reference. Instead, when the function is not present in the main executable
// we consider the default impl provided by asan library.
#define INTERCEPT_SANITIZER_WEAK_FUNCTION(name) \
extern "C" __declspec(noinline) void name() { \
volatile int prevent_icf = (__LINE__ << 8) ^ __COUNTER__; \
static const char function_name[] = #name; \
for (const char* ptr = &function_name[0]; *ptr; ++ptr) \
prevent_icf ^= *ptr; \
(void)prevent_icf; \
__debugbreak(); \
} \
INTERCEPT_WHEN_POSSIBLE(#name, STRINGIFY(WEAK_EXPORT_NAME(name)), name)
// We can't define our own version of strlen etc. because that would lead to
// link-time or even type mismatch errors. Instead, we can declare a function
// just to be able to get its address. Me may miss the first few calls to the
// functions since it can be called before __dll_thunk_init, but that would lead
// to false negatives in the startup code before user's global initializers,
// which isn't a big deal.
#define INTERCEPT_LIBRARY_FUNCTION(name) \
extern "C" void name(); \
INTERCEPT_OR_DIE(WRAPPER_NAME(name), name)
// Use these macros for functions that could be called before __dll_thunk_init()
// is executed and don't lead to errors if defined (free, malloc, etc).
#define INTERCEPT_WRAP_V_V(name) \
extern "C" void name() { \
typedef decltype(name) *fntype; \
static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
fn(); \
} \
INTERCEPT_OR_DIE(#name, name);
#define INTERCEPT_WRAP_V_W(name) \
extern "C" void name(void *arg) { \
typedef decltype(name) *fntype; \
static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
fn(arg); \
} \
INTERCEPT_OR_DIE(#name, name);
#define INTERCEPT_WRAP_V_WW(name) \
extern "C" void name(void *arg1, void *arg2) { \
typedef decltype(name) *fntype; \
static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
fn(arg1, arg2); \
} \
INTERCEPT_OR_DIE(#name, name);
#define INTERCEPT_WRAP_V_WWW(name) \
extern "C" void name(void *arg1, void *arg2, void *arg3) { \
typedef decltype(name) *fntype; \
static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
fn(arg1, arg2, arg3); \
} \
INTERCEPT_OR_DIE(#name, name);
#define INTERCEPT_WRAP_W_V(name) \
extern "C" void *name() { \
typedef decltype(name) *fntype; \
static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
return fn(); \
} \
INTERCEPT_OR_DIE(#name, name);
#define INTERCEPT_WRAP_W_W(name) \
extern "C" void *name(void *arg) { \
typedef decltype(name) *fntype; \
static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
return fn(arg); \
} \
INTERCEPT_OR_DIE(#name, name);
#define INTERCEPT_WRAP_W_WW(name) \
extern "C" void *name(void *arg1, void *arg2) { \
typedef decltype(name) *fntype; \
static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
return fn(arg1, arg2); \
} \
INTERCEPT_OR_DIE(#name, name);
#define INTERCEPT_WRAP_W_WWW(name) \
extern "C" void *name(void *arg1, void *arg2, void *arg3) { \
typedef decltype(name) *fntype; \
static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
return fn(arg1, arg2, arg3); \
} \
INTERCEPT_OR_DIE(#name, name);
#define INTERCEPT_WRAP_W_WWWW(name) \
extern "C" void *name(void *arg1, void *arg2, void *arg3, void *arg4) { \
typedef decltype(name) *fntype; \
static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
return fn(arg1, arg2, arg3, arg4); \
} \
INTERCEPT_OR_DIE(#name, name);
#define INTERCEPT_WRAP_W_WWWWW(name) \
extern "C" void *name(void *arg1, void *arg2, void *arg3, void *arg4, \
void *arg5) { \
typedef decltype(name) *fntype; \
static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
return fn(arg1, arg2, arg3, arg4, arg5); \
} \
INTERCEPT_OR_DIE(#name, name);
#define INTERCEPT_WRAP_W_WWWWWW(name) \
extern "C" void *name(void *arg1, void *arg2, void *arg3, void *arg4, \
void *arg5, void *arg6) { \
typedef decltype(name) *fntype; \
static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
return fn(arg1, arg2, arg3, arg4, arg5, arg6); \
} \
INTERCEPT_OR_DIE(#name, name);
#endif // SANITIZER_WIN_DLL_THUNK_H
|
