asan_new_delete.cc revision 3d763c0d3700e73b3aead8e65e04ec28efc56138
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 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 30using namespace __asan; // NOLINT 31 32// This code has issues on OSX. 33// See https://github.com/google/sanitizers/issues/131. 34 35// Fake std::nothrow_t to avoid including <new>. 36namespace std { 37struct 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 61CXX_OPERATOR_ATTRIBUTE 62void *operator new(size_t size) { OPERATOR_NEW_BODY(FROM_NEW); } 63CXX_OPERATOR_ATTRIBUTE 64void *operator new[](size_t size) { OPERATOR_NEW_BODY(FROM_NEW_BR); } 65CXX_OPERATOR_ATTRIBUTE 66void *operator new(size_t size, std::nothrow_t const&) 67{ OPERATOR_NEW_BODY(FROM_NEW); } 68CXX_OPERATOR_ATTRIBUTE 69void *operator new[](size_t size, std::nothrow_t const&) 70{ OPERATOR_NEW_BODY(FROM_NEW_BR); } 71 72#else // SANITIZER_MAC 73INTERCEPTOR(void *, _Znwm, size_t size) { 74 OPERATOR_NEW_BODY(FROM_NEW); 75} 76INTERCEPTOR(void *, _Znam, size_t size) { 77 OPERATOR_NEW_BODY(FROM_NEW_BR); 78} 79INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) { 80 OPERATOR_NEW_BODY(FROM_NEW); 81} 82INTERCEPTOR(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 92CXX_OPERATOR_ATTRIBUTE 93void operator delete(void *ptr) NOEXCEPT { 94 OPERATOR_DELETE_BODY(FROM_NEW); 95} 96CXX_OPERATOR_ATTRIBUTE 97void operator delete[](void *ptr) NOEXCEPT { 98 OPERATOR_DELETE_BODY(FROM_NEW_BR); 99} 100CXX_OPERATOR_ATTRIBUTE 101void operator delete(void *ptr, std::nothrow_t const&) { 102 OPERATOR_DELETE_BODY(FROM_NEW); 103} 104CXX_OPERATOR_ATTRIBUTE 105void operator delete[](void *ptr, std::nothrow_t const&) { 106 OPERATOR_DELETE_BODY(FROM_NEW_BR); 107} 108CXX_OPERATOR_ATTRIBUTE 109void operator delete(void *ptr, size_t size) NOEXCEPT { 110 GET_STACK_TRACE_FREE; 111 asan_sized_free(ptr, size, &stack, FROM_NEW); 112} 113CXX_OPERATOR_ATTRIBUTE 114void operator delete[](void *ptr, size_t size) NOEXCEPT { 115 GET_STACK_TRACE_FREE; 116 asan_sized_free(ptr, size, &stack, FROM_NEW_BR); 117} 118 119#else // SANITIZER_MAC 120INTERCEPTOR(void, _ZdlPv, void *ptr) { 121 OPERATOR_DELETE_BODY(FROM_NEW); 122} 123INTERCEPTOR(void, _ZdaPv, void *ptr) { 124 OPERATOR_DELETE_BODY(FROM_NEW_BR); 125} 126INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) { 127 OPERATOR_DELETE_BODY(FROM_NEW); 128} 129INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) { 130 OPERATOR_DELETE_BODY(FROM_NEW_BR); 131} 132#endif 133