//===-- asan_dll_thunk.cc -------------------------------------------------===// // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file is a part of AddressSanitizer, an address sanity checker. // // This file defines a family of thunks that should be statically linked into // the DLLs that have ASan instrumentation in order to delegate the calls to the // shared runtime that lives in the main binary. // See https://code.google.com/p/address-sanitizer/issues/detail?id=209 for the // details. //===----------------------------------------------------------------------===// // Only compile this code when buidling asan_dll_thunk.lib // Using #ifdef rather than relying on Makefiles etc. // simplifies the build procedure. #ifdef ASAN_DLL_THUNK #include "sanitizer_common/sanitizer_interception.h" // ----------------- Helper functions and macros --------------------- {{{1 extern "C" { void *__stdcall GetModuleHandleA(const char *module_name); void *__stdcall GetProcAddress(void *module, const char *proc_name); void abort(); } static void *getRealProcAddressOrDie(const char *name) { void *ret = GetProcAddress(GetModuleHandleA(0), name); if (!ret) abort(); return ret; } #define WRAP_V_V(name) \ extern "C" void name() { \ typedef void (*fntype)(); \ static fntype fn = (fntype)getRealProcAddressOrDie(#name); \ fn(); \ } #define WRAP_V_W(name) \ extern "C" void name(void *arg) { \ typedef void (*fntype)(void *arg); \ static fntype fn = (fntype)getRealProcAddressOrDie(#name); \ fn(arg); \ } #define WRAP_V_WW(name) \ extern "C" void name(void *arg1, void *arg2) { \ typedef void (*fntype)(void *, void *); \ static fntype fn = (fntype)getRealProcAddressOrDie(#name); \ fn(arg1, arg2); \ } #define WRAP_V_WWW(name) \ extern "C" void name(void *arg1, void *arg2, void *arg3) { \ typedef void *(*fntype)(void *, void *, void *); \ static fntype fn = (fntype)getRealProcAddressOrDie(#name); \ fn(arg1, arg2, arg3); \ } #define WRAP_W_V(name) \ extern "C" void *name() { \ typedef void *(*fntype)(); \ static fntype fn = (fntype)getRealProcAddressOrDie(#name); \ return fn(); \ } #define WRAP_W_W(name) \ extern "C" void *name(void *arg) { \ typedef void *(*fntype)(void *arg); \ static fntype fn = (fntype)getRealProcAddressOrDie(#name); \ return fn(arg); \ } #define WRAP_W_WW(name) \ extern "C" void *name(void *arg1, void *arg2) { \ typedef void *(*fntype)(void *, void *); \ static fntype fn = (fntype)getRealProcAddressOrDie(#name); \ return fn(arg1, arg2); \ } #define WRAP_W_WWW(name) \ extern "C" void *name(void *arg1, void *arg2, void *arg3) { \ typedef void *(*fntype)(void *, void *, void *); \ static fntype fn = (fntype)getRealProcAddressOrDie(#name); \ return fn(arg1, arg2, arg3); \ } #define WRAP_W_WWWW(name) \ extern "C" void *name(void *arg1, void *arg2, void *arg3, void *arg4) { \ typedef void *(*fntype)(void *, void *, void *, void *); \ static fntype fn = (fntype)getRealProcAddressOrDie(#name); \ return fn(arg1, arg2, arg3, arg4); \ } #define WRAP_W_WWWWW(name) \ extern "C" void *name(void *arg1, void *arg2, void *arg3, void *arg4, \ void *arg5) { \ typedef void *(*fntype)(void *, void *, void *, void *, void *); \ static fntype fn = (fntype)getRealProcAddressOrDie(#name); \ return fn(arg1, arg2, arg3, arg4, arg5); \ } #define WRAP_W_WWWWWW(name) \ extern "C" void *name(void *arg1, void *arg2, void *arg3, void *arg4, \ void *arg5, void *arg6) { \ typedef void *(*fntype)(void *, void *, void *, void *, void *, void *); \ static fntype fn = (fntype)getRealProcAddressOrDie(#name); \ return fn(arg1, arg2, arg3, arg4, arg5, arg6); \ } // }}} // --------- Interface interception helper functions and macros ----------- {{{1 // We need to intercept the ASan interface exported by the DLL thunk and forward // all the functions to the runtime in the main module. // However, we don't want to keep two lists of interface functions. // To avoid that, the list of interface functions should be defined using the // INTERFACE_FUNCTION macro. Then, all the interface can be intercepted at once // by calling INTERCEPT_ASAN_INTERFACE(). // Use macro+template magic to automatically generate the list of interface // functions. Each interface function at line LINE defines a template class // with a static InterfaceInteceptor::Execute() method intercepting the // function. The default implementation of InterfaceInteceptor is to call // the Execute() method corresponding to the previous line. template struct InterfaceInteceptor { static void Execute() { InterfaceInteceptor::Execute(); } }; // There shouldn't be any interface function with negative line number. template<> struct InterfaceInteceptor<0> { static void Execute() {} }; #define INTERFACE_FUNCTION(name) \ extern "C" void name() { __debugbreak(); } \ template<> struct InterfaceInteceptor<__LINE__> { \ static void Execute() { \ void *wrapper = getRealProcAddressOrDie(#name); \ if (!__interception::OverrideFunction((uptr)name, (uptr)wrapper, 0)) \ abort(); \ InterfaceInteceptor<__LINE__-1>::Execute(); \ } \ }; // INTERCEPT_ASAN_INTERFACE must be used after the last INTERFACE_FUNCTION. #define INTERCEPT_ASAN_INTERFACE InterfaceInteceptor<__LINE__>::Execute static void InterceptASanInterface(); // }}} // ----------------- ASan own interface functions -------------------- // Don't use the INTERFACE_FUNCTION machinery for this function as we actually // want to call it in the __asan_init interceptor. WRAP_W_V(__asan_should_detect_stack_use_after_return) extern "C" { int __asan_option_detect_stack_use_after_return; // Manually wrap __asan_init as we need to initialize // __asan_option_detect_stack_use_after_return afterwards. void __asan_init_v3() { typedef void (*fntype)(); static fntype fn = 0; if (fn) return; fn = (fntype)getRealProcAddressOrDie("__asan_init_v3"); fn(); __asan_option_detect_stack_use_after_return = (__asan_should_detect_stack_use_after_return() != 0); InterceptASanInterface(); } } INTERFACE_FUNCTION(__asan_handle_no_return) INTERFACE_FUNCTION(__asan_report_store1) INTERFACE_FUNCTION(__asan_report_store2) INTERFACE_FUNCTION(__asan_report_store4) INTERFACE_FUNCTION(__asan_report_store8) INTERFACE_FUNCTION(__asan_report_store16) INTERFACE_FUNCTION(__asan_report_store_n) INTERFACE_FUNCTION(__asan_report_load1) INTERFACE_FUNCTION(__asan_report_load2) INTERFACE_FUNCTION(__asan_report_load4) INTERFACE_FUNCTION(__asan_report_load8) INTERFACE_FUNCTION(__asan_report_load16) INTERFACE_FUNCTION(__asan_report_load_n) INTERFACE_FUNCTION(__asan_memcpy); INTERFACE_FUNCTION(__asan_memset); INTERFACE_FUNCTION(__asan_memmove); INTERFACE_FUNCTION(__asan_register_globals) INTERFACE_FUNCTION(__asan_unregister_globals) INTERFACE_FUNCTION(__asan_before_dynamic_init) INTERFACE_FUNCTION(__asan_after_dynamic_init) INTERFACE_FUNCTION(__asan_poison_stack_memory) INTERFACE_FUNCTION(__asan_unpoison_stack_memory) INTERFACE_FUNCTION(__asan_poison_memory_region) INTERFACE_FUNCTION(__asan_unpoison_memory_region) INTERFACE_FUNCTION(__asan_get_current_fake_stack) INTERFACE_FUNCTION(__asan_addr_is_in_fake_stack) INTERFACE_FUNCTION(__asan_stack_malloc_0) INTERFACE_FUNCTION(__asan_stack_malloc_1) INTERFACE_FUNCTION(__asan_stack_malloc_2) INTERFACE_FUNCTION(__asan_stack_malloc_3) INTERFACE_FUNCTION(__asan_stack_malloc_4) INTERFACE_FUNCTION(__asan_stack_malloc_5) INTERFACE_FUNCTION(__asan_stack_malloc_6) INTERFACE_FUNCTION(__asan_stack_malloc_7) INTERFACE_FUNCTION(__asan_stack_malloc_8) INTERFACE_FUNCTION(__asan_stack_malloc_9) INTERFACE_FUNCTION(__asan_stack_malloc_10) INTERFACE_FUNCTION(__asan_stack_free_0) INTERFACE_FUNCTION(__asan_stack_free_1) INTERFACE_FUNCTION(__asan_stack_free_2) INTERFACE_FUNCTION(__asan_stack_free_4) INTERFACE_FUNCTION(__asan_stack_free_5) INTERFACE_FUNCTION(__asan_stack_free_6) INTERFACE_FUNCTION(__asan_stack_free_7) INTERFACE_FUNCTION(__asan_stack_free_8) INTERFACE_FUNCTION(__asan_stack_free_9) INTERFACE_FUNCTION(__asan_stack_free_10) // TODO(timurrrr): Add more interface functions on the as-needed basis. // ----------------- Memory allocation functions --------------------- WRAP_V_W(free) WRAP_V_WW(_free_dbg) WRAP_W_W(malloc) WRAP_W_WWWW(_malloc_dbg) WRAP_W_WW(calloc) WRAP_W_WWWWW(_calloc_dbg) WRAP_W_WWW(_calloc_impl) WRAP_W_WW(realloc) WRAP_W_WWW(_realloc_dbg) WRAP_W_WWW(_recalloc) WRAP_W_W(_msize) WRAP_W_W(_expand) WRAP_W_W(_expand_dbg) // TODO(timurrrr): Might want to add support for _aligned_* allocation // functions to detect a bit more bugs. Those functions seem to wrap malloc(). // TODO(timurrrr): Do we need to add _Crt* stuff here? (see asan_malloc_win.cc). void InterceptASanInterface() { INTERCEPT_ASAN_INTERFACE(); } #endif // ASAN_DLL_THUNK