//===-- asan_interceptors.cpp ---------------------------------------------===// // // 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 file is a part of AddressSanitizer, an address sanity checker. // // Interceptors for operators new and delete. //===----------------------------------------------------------------------===// #include #include "asan_allocator.h" #include "asan_internal.h" #include "asan_report.h" #include "asan_stack.h" #include "interception/interception.h" // C++ operators can't have dllexport attributes on Windows. We export them // anyway by passing extra -export flags to the linker, which is exactly that // dllexport would normally do. We need to export them in order to make the // VS2015 dynamic CRT (MD) work. #if SANITIZER_WINDOWS && defined(_MSC_VER) #define CXX_OPERATOR_ATTRIBUTE #define COMMENT_EXPORT(sym) __pragma(comment(linker, "/export:" sym)) #ifdef _WIN64 COMMENT_EXPORT("??2@YAPEAX_K@Z") // operator new COMMENT_EXPORT("??2@YAPEAX_KAEBUnothrow_t@std@@@Z") // operator new nothrow COMMENT_EXPORT("??3@YAXPEAX@Z") // operator delete COMMENT_EXPORT("??3@YAXPEAX_K@Z") // sized operator delete COMMENT_EXPORT("??_U@YAPEAX_K@Z") // operator new[] COMMENT_EXPORT("??_V@YAXPEAX@Z") // operator delete[] #else COMMENT_EXPORT("??2@YAPAXI@Z") // operator new COMMENT_EXPORT("??2@YAPAXIABUnothrow_t@std@@@Z") // operator new nothrow COMMENT_EXPORT("??3@YAXPAX@Z") // operator delete COMMENT_EXPORT("??3@YAXPAXI@Z") // sized operator delete COMMENT_EXPORT("??_U@YAPAXI@Z") // operator new[] COMMENT_EXPORT("??_V@YAXPAX@Z") // operator delete[] #endif #undef COMMENT_EXPORT #else #define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE #endif using namespace __asan; // FreeBSD prior v9.2 have wrong definition of 'size_t'. // http://svnweb.freebsd.org/base?view=revision&revision=232261 #if SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32 #include #if __FreeBSD_version <= 902001 // v9.2 #define size_t unsigned #endif // __FreeBSD_version #endif // SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32 // This code has issues on OSX. // See https://github.com/google/sanitizers/issues/131. // Fake std::nothrow_t and std::align_val_t to avoid including . namespace std { struct nothrow_t {}; enum class align_val_t: size_t {}; } // namespace std // TODO(alekseyshl): throw std::bad_alloc instead of dying on OOM. // For local pool allocation, align to SHADOW_GRANULARITY to match asan // allocator behavior. #define OPERATOR_NEW_BODY(type, nothrow) \ GET_STACK_TRACE_MALLOC; \ void *res = asan_memalign(0, size, &stack, type); \ if (!nothrow && UNLIKELY(!res)) \ ReportOutOfMemory(size, &stack); \ return res; #define OPERATOR_NEW_BODY_ALIGN(type, nothrow) \ GET_STACK_TRACE_MALLOC; \ void *res = asan_memalign((uptr)align, size, &stack, type); \ if (!nothrow && UNLIKELY(!res)) \ ReportOutOfMemory(size, &stack); \ return res; // On OS X it's not enough to just provide our own 'operator new' and // 'operator delete' implementations, because they're going to be in the // runtime dylib, and the main executable will depend on both the runtime // dylib and libstdc++, each of those'll have its implementation of new and // delete. // To make sure that C++ allocation/deallocation operators are overridden on // OS X we need to intercept them using their mangled names. #if !SANITIZER_APPLE CXX_OPERATOR_ATTRIBUTE void *operator new(size_t size) { OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/); } CXX_OPERATOR_ATTRIBUTE void *operator new[](size_t size) { OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/); } CXX_OPERATOR_ATTRIBUTE void *operator new(size_t size, std::nothrow_t const&) { OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/); } CXX_OPERATOR_ATTRIBUTE void *operator new[](size_t size, std::nothrow_t const&) { OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/); } CXX_OPERATOR_ATTRIBUTE void *operator new(size_t size, std::align_val_t align) { OPERATOR_NEW_BODY_ALIGN(FROM_NEW, false /*nothrow*/); } CXX_OPERATOR_ATTRIBUTE void *operator new[](size_t size, std::align_val_t align) { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, false /*nothrow*/); } CXX_OPERATOR_ATTRIBUTE void *operator new(size_t size, std::align_val_t align, std::nothrow_t const&) { OPERATOR_NEW_BODY_ALIGN(FROM_NEW, true /*nothrow*/); } CXX_OPERATOR_ATTRIBUTE void *operator new[](size_t size, std::align_val_t align, std::nothrow_t const&) { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, true /*nothrow*/); } #else // SANITIZER_APPLE INTERCEPTOR(void *, _Znwm, size_t size) { OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/); } INTERCEPTOR(void *, _Znam, size_t size) { OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/); } INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) { OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/); } INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) { OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/); } #endif // !SANITIZER_APPLE #define OPERATOR_DELETE_BODY(type) \ GET_STACK_TRACE_FREE; \ asan_delete(ptr, 0, 0, &stack, type); #define OPERATOR_DELETE_BODY_SIZE(type) \ GET_STACK_TRACE_FREE; \ asan_delete(ptr, size, 0, &stack, type); #define OPERATOR_DELETE_BODY_ALIGN(type) \ GET_STACK_TRACE_FREE; \ asan_delete(ptr, 0, static_cast(align), &stack, type); #define OPERATOR_DELETE_BODY_SIZE_ALIGN(type) \ GET_STACK_TRACE_FREE; \ asan_delete(ptr, size, static_cast(align), &stack, type); #if !SANITIZER_APPLE CXX_OPERATOR_ATTRIBUTE void operator delete(void *ptr) NOEXCEPT { OPERATOR_DELETE_BODY(FROM_NEW); } CXX_OPERATOR_ATTRIBUTE void operator delete[](void *ptr) NOEXCEPT { OPERATOR_DELETE_BODY(FROM_NEW_BR); } CXX_OPERATOR_ATTRIBUTE void operator delete(void *ptr, std::nothrow_t const&) { OPERATOR_DELETE_BODY(FROM_NEW); } CXX_OPERATOR_ATTRIBUTE void operator delete[](void *ptr, std::nothrow_t const&) { OPERATOR_DELETE_BODY(FROM_NEW_BR); } CXX_OPERATOR_ATTRIBUTE void operator delete(void *ptr, size_t size) NOEXCEPT { OPERATOR_DELETE_BODY_SIZE(FROM_NEW); } CXX_OPERATOR_ATTRIBUTE void operator delete[](void *ptr, size_t size) NOEXCEPT { OPERATOR_DELETE_BODY_SIZE(FROM_NEW_BR); } CXX_OPERATOR_ATTRIBUTE void operator delete(void *ptr, std::align_val_t align) NOEXCEPT { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW); } CXX_OPERATOR_ATTRIBUTE void operator delete[](void *ptr, std::align_val_t align) NOEXCEPT { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR); } CXX_OPERATOR_ATTRIBUTE void operator delete(void *ptr, std::align_val_t align, std::nothrow_t const&) { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW); } CXX_OPERATOR_ATTRIBUTE void operator delete[](void *ptr, std::align_val_t align, std::nothrow_t const&) { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR); } CXX_OPERATOR_ATTRIBUTE void operator delete(void *ptr, size_t size, std::align_val_t align) NOEXCEPT { OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW); } CXX_OPERATOR_ATTRIBUTE void operator delete[](void *ptr, size_t size, std::align_val_t align) NOEXCEPT { OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW_BR); } #else // SANITIZER_APPLE INTERCEPTOR(void, _ZdlPv, void *ptr) { OPERATOR_DELETE_BODY(FROM_NEW); } INTERCEPTOR(void, _ZdaPv, void *ptr) { OPERATOR_DELETE_BODY(FROM_NEW_BR); } INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) { OPERATOR_DELETE_BODY(FROM_NEW); } INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) { OPERATOR_DELETE_BODY(FROM_NEW_BR); } #endif // !SANITIZER_APPLE