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 "sanitizer_common/sanitizer_interception.h" 20 21 #include <stddef.h> 22 23 // C++ operators can't have visibility attributes on Windows. 24 #if SANITIZER_WINDOWS 25 # define CXX_OPERATOR_ATTRIBUTE 26 #else 27 # define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE 28 #endif 29 30 using namespace __asan; // NOLINT 31 32 // This code has issues on OSX. 33 // See https://code.google.com/p/address-sanitizer/issues/detail?id=131. 34 35 // Fake std::nothrow_t to avoid including <new>. 36 namespace std { 37 struct nothrow_t {}; 38 } // namespace std 39 40 #define OPERATOR_NEW_BODY(type) \ 41 GET_STACK_TRACE_MALLOC;\ 42 return asan_memalign(0, size, &stack, type); 43 44 // On OS X it's not enough to just provide our own 'operator new' and 45 // 'operator delete' implementations, because they're going to be in the 46 // runtime dylib, and the main executable will depend on both the runtime 47 // dylib and libstdc++, each of those'll have its implementation of new and 48 // delete. 49 // To make sure that C++ allocation/deallocation operators are overridden on 50 // OS X we need to intercept them using their mangled names. 51 #if !SANITIZER_MAC 52 // FreeBSD prior v9.2 have wrong definition of 'size_t'. 53 // http://svnweb.freebsd.org/base?view=revision&revision=232261 54 #if SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32 55 #include <sys/param.h> 56 #if __FreeBSD_version <= 902001 // v9.2 57 #define size_t unsigned 58 #endif // __FreeBSD_version 59 #endif // SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32 60 61 CXX_OPERATOR_ATTRIBUTE 62 void *operator new(size_t size) { OPERATOR_NEW_BODY(FROM_NEW); } 63 CXX_OPERATOR_ATTRIBUTE 64 void *operator new[](size_t size) { OPERATOR_NEW_BODY(FROM_NEW_BR); } 65 CXX_OPERATOR_ATTRIBUTE 66 void *operator new(size_t size, std::nothrow_t const&) 67 { OPERATOR_NEW_BODY(FROM_NEW); } 68 CXX_OPERATOR_ATTRIBUTE 69 void *operator new[](size_t size, std::nothrow_t const&) 70 { OPERATOR_NEW_BODY(FROM_NEW_BR); } 71 72 #else // SANITIZER_MAC 73 INTERCEPTOR(void *, _Znwm, size_t size) { 74 OPERATOR_NEW_BODY(FROM_NEW); 75 } 76 INTERCEPTOR(void *, _Znam, size_t size) { 77 OPERATOR_NEW_BODY(FROM_NEW_BR); 78 } 79 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) { 80 OPERATOR_NEW_BODY(FROM_NEW); 81 } 82 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) { 83 OPERATOR_NEW_BODY(FROM_NEW_BR); 84 } 85 #endif 86 87 #define OPERATOR_DELETE_BODY(type) \ 88 GET_STACK_TRACE_FREE;\ 89 asan_free(ptr, &stack, type); 90 91 #if !SANITIZER_MAC 92 CXX_OPERATOR_ATTRIBUTE 93 void operator delete(void *ptr) throw() { 94 OPERATOR_DELETE_BODY(FROM_NEW); 95 } 96 CXX_OPERATOR_ATTRIBUTE 97 void operator delete[](void *ptr) throw() { 98 OPERATOR_DELETE_BODY(FROM_NEW_BR); 99 } 100 CXX_OPERATOR_ATTRIBUTE 101 void operator delete(void *ptr, std::nothrow_t const&) { 102 OPERATOR_DELETE_BODY(FROM_NEW); 103 } 104 CXX_OPERATOR_ATTRIBUTE 105 void operator delete[](void *ptr, std::nothrow_t const&) { 106 OPERATOR_DELETE_BODY(FROM_NEW_BR); 107 } 108 109 #else // SANITIZER_MAC 110 INTERCEPTOR(void, _ZdlPv, void *ptr) { 111 OPERATOR_DELETE_BODY(FROM_NEW); 112 } 113 INTERCEPTOR(void, _ZdaPv, void *ptr) { 114 OPERATOR_DELETE_BODY(FROM_NEW_BR); 115 } 116 INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) { 117 OPERATOR_DELETE_BODY(FROM_NEW); 118 } 119 INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) { 120 OPERATOR_DELETE_BODY(FROM_NEW_BR); 121 } 122 #endif 123
