1 //===-- asan_interceptors.cpp ---------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is a part of AddressSanitizer, an address sanity checker. 10 // 11 // Interceptors for operators new and delete. 12 //===----------------------------------------------------------------------===// 13 14 #include <stddef.h> 15 16 #include "asan_allocator.h" 17 #include "asan_internal.h" 18 #include "asan_report.h" 19 #include "asan_stack.h" 20 #include "interception/interception.h" 21 22 // C++ operators can't have dllexport attributes on Windows. We export them 23 // anyway by passing extra -export flags to the linker, which is exactly that 24 // dllexport would normally do. We need to export them in order to make the 25 // VS2015 dynamic CRT (MD) work. 26 #if SANITIZER_WINDOWS && defined(_MSC_VER) 27 #define CXX_OPERATOR_ATTRIBUTE 28 #define COMMENT_EXPORT(sym) __pragma(comment(linker, "/export:" sym)) 29 #ifdef _WIN64 30 COMMENT_EXPORT("??2@YAPEAX_K@Z") // operator new 31 COMMENT_EXPORT("??2@YAPEAX_KAEBUnothrow_t@std@@@Z") // operator new nothrow 32 COMMENT_EXPORT("??3@YAXPEAX@Z") // operator delete 33 COMMENT_EXPORT("??3@YAXPEAX_K@Z") // sized operator delete 34 COMMENT_EXPORT("??_U@YAPEAX_K@Z") // operator new[] 35 COMMENT_EXPORT("??_V@YAXPEAX@Z") // operator delete[] 36 #else 37 COMMENT_EXPORT("??2@YAPAXI@Z") // operator new 38 COMMENT_EXPORT("??2@YAPAXIABUnothrow_t@std@@@Z") // operator new nothrow 39 COMMENT_EXPORT("??3@YAXPAX@Z") // operator delete 40 COMMENT_EXPORT("??3@YAXPAXI@Z") // sized operator delete 41 COMMENT_EXPORT("??_U@YAPAXI@Z") // operator new[] 42 COMMENT_EXPORT("??_V@YAXPAX@Z") // operator delete[] 43 #endif 44 #undef COMMENT_EXPORT 45 #else 46 #define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE 47 #endif 48 49 using namespace __asan; 50 51 // FreeBSD prior v9.2 have wrong definition of 'size_t'. 52 // http://svnweb.freebsd.org/base?view=revision&revision=232261 53 #if SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32 54 #include <sys/param.h> 55 #if __FreeBSD_version <= 902001 // v9.2 56 #define size_t unsigned 57 #endif // __FreeBSD_version 58 #endif // SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32 59 60 // This code has issues on OSX. 61 // See https://github.com/google/sanitizers/issues/131. 62 63 // Fake std::nothrow_t and std::align_val_t to avoid including <new>. 64 namespace std { 65 struct nothrow_t {}; 66 enum class align_val_t: size_t {}; 67 } // namespace std 68 69 // TODO(alekseyshl): throw std::bad_alloc instead of dying on OOM. 70 // For local pool allocation, align to SHADOW_GRANULARITY to match asan 71 // allocator behavior. 72 #define OPERATOR_NEW_BODY(type, nothrow) \ 73 GET_STACK_TRACE_MALLOC; \ 74 void *res = asan_memalign(0, size, &stack, type); \ 75 if (!nothrow && UNLIKELY(!res)) \ 76 ReportOutOfMemory(size, &stack); \ 77 return res; 78 #define OPERATOR_NEW_BODY_ALIGN(type, nothrow) \ 79 GET_STACK_TRACE_MALLOC; \ 80 void *res = asan_memalign((uptr)align, size, &stack, type); \ 81 if (!nothrow && UNLIKELY(!res)) \ 82 ReportOutOfMemory(size, &stack); \ 83 return res; 84 85 // On OS X it's not enough to just provide our own 'operator new' and 86 // 'operator delete' implementations, because they're going to be in the 87 // runtime dylib, and the main executable will depend on both the runtime 88 // dylib and libstdc++, each of those'll have its implementation of new and 89 // delete. 90 // To make sure that C++ allocation/deallocation operators are overridden on 91 // OS X we need to intercept them using their mangled names. 92 #if !SANITIZER_APPLE 93 CXX_OPERATOR_ATTRIBUTE 94 void *operator new(size_t size) 95 { OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/); } 96 CXX_OPERATOR_ATTRIBUTE 97 void *operator new[](size_t size) 98 { OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/); } 99 CXX_OPERATOR_ATTRIBUTE 100 void *operator new(size_t size, std::nothrow_t const&) 101 { OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/); } 102 CXX_OPERATOR_ATTRIBUTE 103 void *operator new[](size_t size, std::nothrow_t const&) 104 { OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/); } 105 CXX_OPERATOR_ATTRIBUTE 106 void *operator new(size_t size, std::align_val_t align) 107 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW, false /*nothrow*/); } 108 CXX_OPERATOR_ATTRIBUTE 109 void *operator new[](size_t size, std::align_val_t align) 110 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, false /*nothrow*/); } 111 CXX_OPERATOR_ATTRIBUTE 112 void *operator new(size_t size, std::align_val_t align, std::nothrow_t const&) 113 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW, true /*nothrow*/); } 114 CXX_OPERATOR_ATTRIBUTE 115 void *operator new[](size_t size, std::align_val_t align, std::nothrow_t const&) 116 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, true /*nothrow*/); } 117 118 #else // SANITIZER_APPLE 119 INTERCEPTOR(void *, _Znwm, size_t size) { 120 OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/); 121 } 122 INTERCEPTOR(void *, _Znam, size_t size) { 123 OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/); 124 } 125 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) { 126 OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/); 127 } 128 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) { 129 OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/); 130 } 131 #endif // !SANITIZER_APPLE 132 133 #define OPERATOR_DELETE_BODY(type) \ 134 GET_STACK_TRACE_FREE; \ 135 asan_delete(ptr, 0, 0, &stack, type); 136 137 #define OPERATOR_DELETE_BODY_SIZE(type) \ 138 GET_STACK_TRACE_FREE; \ 139 asan_delete(ptr, size, 0, &stack, type); 140 141 #define OPERATOR_DELETE_BODY_ALIGN(type) \ 142 GET_STACK_TRACE_FREE; \ 143 asan_delete(ptr, 0, static_cast<uptr>(align), &stack, type); 144 145 #define OPERATOR_DELETE_BODY_SIZE_ALIGN(type) \ 146 GET_STACK_TRACE_FREE; \ 147 asan_delete(ptr, size, static_cast<uptr>(align), &stack, type); 148 149 #if !SANITIZER_APPLE 150 CXX_OPERATOR_ATTRIBUTE 151 void operator delete(void *ptr) NOEXCEPT 152 { OPERATOR_DELETE_BODY(FROM_NEW); } 153 CXX_OPERATOR_ATTRIBUTE 154 void operator delete[](void *ptr) NOEXCEPT 155 { OPERATOR_DELETE_BODY(FROM_NEW_BR); } 156 CXX_OPERATOR_ATTRIBUTE 157 void operator delete(void *ptr, std::nothrow_t const&) 158 { OPERATOR_DELETE_BODY(FROM_NEW); } 159 CXX_OPERATOR_ATTRIBUTE 160 void operator delete[](void *ptr, std::nothrow_t const&) 161 { OPERATOR_DELETE_BODY(FROM_NEW_BR); } 162 CXX_OPERATOR_ATTRIBUTE 163 void operator delete(void *ptr, size_t size) NOEXCEPT 164 { OPERATOR_DELETE_BODY_SIZE(FROM_NEW); } 165 CXX_OPERATOR_ATTRIBUTE 166 void operator delete[](void *ptr, size_t size) NOEXCEPT 167 { OPERATOR_DELETE_BODY_SIZE(FROM_NEW_BR); } 168 CXX_OPERATOR_ATTRIBUTE 169 void operator delete(void *ptr, std::align_val_t align) NOEXCEPT 170 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW); } 171 CXX_OPERATOR_ATTRIBUTE 172 void operator delete[](void *ptr, std::align_val_t align) NOEXCEPT 173 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR); } 174 CXX_OPERATOR_ATTRIBUTE 175 void operator delete(void *ptr, std::align_val_t align, std::nothrow_t const&) 176 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW); } 177 CXX_OPERATOR_ATTRIBUTE 178 void operator delete[](void *ptr, std::align_val_t align, std::nothrow_t const&) 179 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR); } 180 CXX_OPERATOR_ATTRIBUTE 181 void operator delete(void *ptr, size_t size, std::align_val_t align) NOEXCEPT 182 { OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW); } 183 CXX_OPERATOR_ATTRIBUTE 184 void operator delete[](void *ptr, size_t size, std::align_val_t align) NOEXCEPT 185 { OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW_BR); } 186 187 #else // SANITIZER_APPLE 188 INTERCEPTOR(void, _ZdlPv, void *ptr) 189 { OPERATOR_DELETE_BODY(FROM_NEW); } 190 INTERCEPTOR(void, _ZdaPv, void *ptr) 191 { OPERATOR_DELETE_BODY(FROM_NEW_BR); } 192 INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) 193 { OPERATOR_DELETE_BODY(FROM_NEW); } 194 INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) 195 { OPERATOR_DELETE_BODY(FROM_NEW_BR); } 196 #endif // !SANITIZER_APPLE 197
Indexes created Sat Feb 28 05:31:39 UTC 2026