1 //===-- asan_interceptors.cc ----------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file is a part of AddressSanitizer, an address sanity checker. 11 // 12 // Interceptors for operators new and delete. 13 //===----------------------------------------------------------------------===// 14 15 #include "asan_allocator.h" 16 #include "asan_internal.h" 17 #include "asan_stack.h" 18 19 #include "interception/interception.h" 20 21 #include <stddef.h> 22 23 // C++ operators can't have dllexport attributes on Windows. We export them 24 // anyway by passing extra -export flags to the linker, which is exactly that 25 // dllexport would normally do. We need to export them in order to make the 26 // VS2015 dynamic CRT (MD) work. 27 #if SANITIZER_WINDOWS 28 # define CXX_OPERATOR_ATTRIBUTE 29 # ifdef _WIN64 30 # pragma comment(linker, "/export:??2@YAPEAX_K@Z") // operator new 31 # pragma comment(linker, "/export:??3@YAXPEAX@Z") // operator delete 32 # pragma comment(linker, "/export:??3@YAXPEAX_K@Z") // sized operator delete 33 # pragma comment(linker, "/export:??_U@YAPEAX_K@Z") // operator new[] 34 # pragma comment(linker, "/export:??_V@YAXPEAX@Z") // operator delete[] 35 # else 36 # pragma comment(linker, "/export:??2@YAPAXI@Z") // operator new 37 # pragma comment(linker, "/export:??3@YAXPAX@Z") // operator delete 38 # pragma comment(linker, "/export:??3@YAXPAXI@Z") // sized operator delete 39 # pragma comment(linker, "/export:??_U@YAPAXI@Z") // operator new[] 40 # pragma comment(linker, "/export:??_V@YAXPAX@Z") // operator delete[] 41 # endif 42 #else 43 # define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE 44 #endif 45 46 using namespace __asan; // NOLINT 47 48 // This code has issues on OSX. 49 // See https://github.com/google/sanitizers/issues/131. 50 51 // Fake std::nothrow_t to avoid including <new>. 52 namespace std { 53 struct nothrow_t {}; 54 } // namespace std 55 56 #define OPERATOR_NEW_BODY(type) \ 57 GET_STACK_TRACE_MALLOC;\ 58 return asan_memalign(0, size, &stack, type); 59 60 // On OS X it's not enough to just provide our own 'operator new' and 61 // 'operator delete' implementations, because they're going to be in the 62 // runtime dylib, and the main executable will depend on both the runtime 63 // dylib and libstdc++, each of those'll have its implementation of new and 64 // delete. 65 // To make sure that C++ allocation/deallocation operators are overridden on 66 // OS X we need to intercept them using their mangled names. 67 #if !SANITIZER_MAC 68 // FreeBSD prior v9.2 have wrong definition of 'size_t'. 69 // http://svnweb.freebsd.org/base?view=revision&revision=232261 70 #if SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32 71 #include <sys/param.h> 72 #if __FreeBSD_version <= 902001 // v9.2 73 #define size_t unsigned 74 #endif // __FreeBSD_version 75 #endif // SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32 76 77 CXX_OPERATOR_ATTRIBUTE 78 void *operator new(size_t size) { OPERATOR_NEW_BODY(FROM_NEW); } 79 CXX_OPERATOR_ATTRIBUTE 80 void *operator new[](size_t size) { OPERATOR_NEW_BODY(FROM_NEW_BR); } 81 CXX_OPERATOR_ATTRIBUTE 82 void *operator new(size_t size, std::nothrow_t const&) 83 { OPERATOR_NEW_BODY(FROM_NEW); } 84 CXX_OPERATOR_ATTRIBUTE 85 void *operator new[](size_t size, std::nothrow_t const&) 86 { OPERATOR_NEW_BODY(FROM_NEW_BR); } 87 88 #else // SANITIZER_MAC 89 INTERCEPTOR(void *, _Znwm, size_t size) { 90 OPERATOR_NEW_BODY(FROM_NEW); 91 } 92 INTERCEPTOR(void *, _Znam, size_t size) { 93 OPERATOR_NEW_BODY(FROM_NEW_BR); 94 } 95 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) { 96 OPERATOR_NEW_BODY(FROM_NEW); 97 } 98 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) { 99 OPERATOR_NEW_BODY(FROM_NEW_BR); 100 } 101 #endif 102 103 #define OPERATOR_DELETE_BODY(type) \ 104 GET_STACK_TRACE_FREE;\ 105 asan_free(ptr, &stack, type); 106 107 #if !SANITIZER_MAC 108 CXX_OPERATOR_ATTRIBUTE 109 void operator delete(void *ptr) NOEXCEPT { 110 OPERATOR_DELETE_BODY(FROM_NEW); 111 } 112 CXX_OPERATOR_ATTRIBUTE 113 void operator delete[](void *ptr) NOEXCEPT { 114 OPERATOR_DELETE_BODY(FROM_NEW_BR); 115 } 116 CXX_OPERATOR_ATTRIBUTE 117 void operator delete(void *ptr, std::nothrow_t const&) { 118 OPERATOR_DELETE_BODY(FROM_NEW); 119 } 120 CXX_OPERATOR_ATTRIBUTE 121 void operator delete[](void *ptr, std::nothrow_t const&) { 122 OPERATOR_DELETE_BODY(FROM_NEW_BR); 123 } 124 CXX_OPERATOR_ATTRIBUTE 125 void operator delete(void *ptr, size_t size) NOEXCEPT { 126 GET_STACK_TRACE_FREE; 127 asan_sized_free(ptr, size, &stack, FROM_NEW); 128 } 129 CXX_OPERATOR_ATTRIBUTE 130 void operator delete[](void *ptr, size_t size) NOEXCEPT { 131 GET_STACK_TRACE_FREE; 132 asan_sized_free(ptr, size, &stack, FROM_NEW_BR); 133 } 134 135 #else // SANITIZER_MAC 136 INTERCEPTOR(void, _ZdlPv, void *ptr) { 137 OPERATOR_DELETE_BODY(FROM_NEW); 138 } 139 INTERCEPTOR(void, _ZdaPv, void *ptr) { 140 OPERATOR_DELETE_BODY(FROM_NEW_BR); 141 } 142 INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) { 143 OPERATOR_DELETE_BODY(FROM_NEW); 144 } 145 INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) { 146 OPERATOR_DELETE_BODY(FROM_NEW_BR); 147 } 148 #endif 149
