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181 lines
11 KiB
C
181 lines
11 KiB
C
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//===-- sanitizer_win_dll_thunk.h -----------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// This header provide helper macros to delegate calls to the shared runtime
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// that lives in the main executable. It should be included to dll_thunks that
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// will be linked to the dlls, when the sanitizer is a static library included
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// in the main executable.
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_WIN_DLL_THUNK_H
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#define SANITIZER_WIN_DLL_THUNK_H
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#include "sanitizer_internal_defs.h"
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namespace __sanitizer {
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uptr dllThunkGetRealAddrOrDie(const char *name);
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int dllThunkIntercept(const char* main_function, uptr dll_function);
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int dllThunkInterceptWhenPossible(const char* main_function,
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const char* default_function, uptr dll_function);
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}
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extern "C" int __dll_thunk_init();
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// ----------------- Function interception helper macros -------------------- //
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// Override dll_function with main_function from main executable.
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#define INTERCEPT_OR_DIE(main_function, dll_function) \
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static int intercept_##dll_function() { \
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return __sanitizer::dllThunkIntercept(main_function, (__sanitizer::uptr) \
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dll_function); \
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} \
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__pragma(section(".DLLTH$M", long, read)) \
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__declspec(allocate(".DLLTH$M")) int (*__dll_thunk_##dll_function)() = \
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intercept_##dll_function;
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// Try to override dll_function with main_function from main executable.
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// If main_function is not present, override dll_function with default_function.
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#define INTERCEPT_WHEN_POSSIBLE(main_function, default_function, dll_function) \
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static int intercept_##dll_function() { \
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return __sanitizer::dllThunkInterceptWhenPossible(main_function, \
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default_function, (__sanitizer::uptr)dll_function); \
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} \
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__pragma(section(".DLLTH$M", long, read)) \
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__declspec(allocate(".DLLTH$M")) int (*__dll_thunk_##dll_function)() = \
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intercept_##dll_function;
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// -------------------- Function interception macros ------------------------ //
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// Special case of hooks -- ASan own interface functions. Those are only called
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// after __asan_init, thus an empty implementation is sufficient.
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#define INTERCEPT_SANITIZER_FUNCTION(name) \
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extern "C" __declspec(noinline) void name() { \
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volatile int prevent_icf = (__LINE__ << 8) ^ __COUNTER__; \
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static const char function_name[] = #name; \
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for (const char* ptr = &function_name[0]; *ptr; ++ptr) \
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prevent_icf ^= *ptr; \
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(void)prevent_icf; \
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__debugbreak(); \
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} \
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INTERCEPT_OR_DIE(#name, name)
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// Special case of hooks -- Weak functions, could be redefined in the main
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// executable, but that is not necessary, so we shouldn't die if we can not find
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// a reference. Instead, when the function is not present in the main executable
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// we consider the default impl provided by asan library.
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#define INTERCEPT_SANITIZER_WEAK_FUNCTION(name) \
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extern "C" __declspec(noinline) void name() { \
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volatile int prevent_icf = (__LINE__ << 8) ^ __COUNTER__; \
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static const char function_name[] = #name; \
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for (const char* ptr = &function_name[0]; *ptr; ++ptr) \
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prevent_icf ^= *ptr; \
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(void)prevent_icf; \
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__debugbreak(); \
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} \
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INTERCEPT_WHEN_POSSIBLE(#name, STRINGIFY(WEAK_EXPORT_NAME(name)), name)
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// We can't define our own version of strlen etc. because that would lead to
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// link-time or even type mismatch errors. Instead, we can declare a function
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// just to be able to get its address. Me may miss the first few calls to the
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// functions since it can be called before __dll_thunk_init, but that would lead
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// to false negatives in the startup code before user's global initializers,
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// which isn't a big deal.
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#define INTERCEPT_LIBRARY_FUNCTION(name) \
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extern "C" void name(); \
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INTERCEPT_OR_DIE(WRAPPER_NAME(name), name)
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// Use these macros for functions that could be called before __dll_thunk_init()
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// is executed and don't lead to errors if defined (free, malloc, etc).
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#define INTERCEPT_WRAP_V_V(name) \
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extern "C" void name() { \
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typedef decltype(name) *fntype; \
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static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
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fn(); \
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} \
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INTERCEPT_OR_DIE(#name, name);
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#define INTERCEPT_WRAP_V_W(name) \
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extern "C" void name(void *arg) { \
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typedef decltype(name) *fntype; \
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static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
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fn(arg); \
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} \
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INTERCEPT_OR_DIE(#name, name);
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#define INTERCEPT_WRAP_V_WW(name) \
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extern "C" void name(void *arg1, void *arg2) { \
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typedef decltype(name) *fntype; \
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static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
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fn(arg1, arg2); \
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} \
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INTERCEPT_OR_DIE(#name, name);
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#define INTERCEPT_WRAP_V_WWW(name) \
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extern "C" void name(void *arg1, void *arg2, void *arg3) { \
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typedef decltype(name) *fntype; \
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static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
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fn(arg1, arg2, arg3); \
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} \
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INTERCEPT_OR_DIE(#name, name);
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#define INTERCEPT_WRAP_W_V(name) \
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extern "C" void *name() { \
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typedef decltype(name) *fntype; \
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static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
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return fn(); \
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} \
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INTERCEPT_OR_DIE(#name, name);
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#define INTERCEPT_WRAP_W_W(name) \
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extern "C" void *name(void *arg) { \
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typedef decltype(name) *fntype; \
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static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
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return fn(arg); \
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} \
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INTERCEPT_OR_DIE(#name, name);
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#define INTERCEPT_WRAP_W_WW(name) \
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extern "C" void *name(void *arg1, void *arg2) { \
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typedef decltype(name) *fntype; \
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static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
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return fn(arg1, arg2); \
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} \
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INTERCEPT_OR_DIE(#name, name);
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#define INTERCEPT_WRAP_W_WWW(name) \
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extern "C" void *name(void *arg1, void *arg2, void *arg3) { \
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typedef decltype(name) *fntype; \
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static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
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return fn(arg1, arg2, arg3); \
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} \
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INTERCEPT_OR_DIE(#name, name);
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#define INTERCEPT_WRAP_W_WWWW(name) \
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extern "C" void *name(void *arg1, void *arg2, void *arg3, void *arg4) { \
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typedef decltype(name) *fntype; \
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static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
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return fn(arg1, arg2, arg3, arg4); \
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} \
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INTERCEPT_OR_DIE(#name, name);
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#define INTERCEPT_WRAP_W_WWWWW(name) \
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extern "C" void *name(void *arg1, void *arg2, void *arg3, void *arg4, \
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void *arg5) { \
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typedef decltype(name) *fntype; \
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static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
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return fn(arg1, arg2, arg3, arg4, arg5); \
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} \
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INTERCEPT_OR_DIE(#name, name);
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#define INTERCEPT_WRAP_W_WWWWWW(name) \
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extern "C" void *name(void *arg1, void *arg2, void *arg3, void *arg4, \
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void *arg5, void *arg6) { \
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typedef decltype(name) *fntype; \
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static fntype fn = (fntype)__sanitizer::dllThunkGetRealAddrOrDie(#name); \
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return fn(arg1, arg2, arg3, arg4, arg5, arg6); \
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} \
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INTERCEPT_OR_DIE(#name, name);
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#endif // SANITIZER_WIN_DLL_THUNK_H
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