1 //===-- asan_interceptors.cc ----------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is a part of AddressSanitizer, an address sanity checker.
12 // Interceptors for operators new and delete.
13 //===----------------------------------------------------------------------===//
15 #include "asan_allocator.h"
16 #include "asan_internal.h"
17 #include "asan_stack.h"
19 #include "interception/interception.h"
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.
28 # define CXX_OPERATOR_ATTRIBUTE
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[]
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[]
43 # define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE
46 using namespace __asan; // NOLINT
48 // FreeBSD prior v9.2 have wrong definition of 'size_t'.
49 // http://svnweb.freebsd.org/base?view=revision&revision=232261
50 #if SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
51 #include <sys/param.h>
52 #if __FreeBSD_version <= 902001 // v9.2
53 #define size_t unsigned
54 #endif // __FreeBSD_version
55 #endif // SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
57 // This code has issues on OSX.
58 // See https://github.com/google/sanitizers/issues/131.
60 // Fake std::nothrow_t and std::align_val_t to avoid including <new>.
63 enum class align_val_t: size_t {};
66 #define OPERATOR_NEW_BODY(type) \
67 GET_STACK_TRACE_MALLOC;\
68 return asan_memalign(0, size, &stack, type);
69 #define OPERATOR_NEW_BODY_ALIGN(type) \
70 GET_STACK_TRACE_MALLOC;\
71 return asan_memalign((uptr)align, size, &stack, type);
73 // On OS X it's not enough to just provide our own 'operator new' and
74 // 'operator delete' implementations, because they're going to be in the
75 // runtime dylib, and the main executable will depend on both the runtime
76 // dylib and libstdc++, each of those'll have its implementation of new and
78 // To make sure that C++ allocation/deallocation operators are overridden on
79 // OS X we need to intercept them using their mangled names.
81 CXX_OPERATOR_ATTRIBUTE
82 void *operator new(size_t size) { OPERATOR_NEW_BODY(FROM_NEW); }
83 CXX_OPERATOR_ATTRIBUTE
84 void *operator new[](size_t size) { OPERATOR_NEW_BODY(FROM_NEW_BR); }
85 CXX_OPERATOR_ATTRIBUTE
86 void *operator new(size_t size, std::nothrow_t const&)
87 { OPERATOR_NEW_BODY(FROM_NEW); }
88 CXX_OPERATOR_ATTRIBUTE
89 void *operator new[](size_t size, std::nothrow_t const&)
90 { OPERATOR_NEW_BODY(FROM_NEW_BR); }
91 CXX_OPERATOR_ATTRIBUTE
92 void *operator new(size_t size, std::align_val_t align)
93 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW); }
94 CXX_OPERATOR_ATTRIBUTE
95 void *operator new[](size_t size, std::align_val_t align)
96 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR); }
97 CXX_OPERATOR_ATTRIBUTE
98 void *operator new(size_t size, std::align_val_t align, std::nothrow_t const&)
99 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW); }
100 CXX_OPERATOR_ATTRIBUTE
101 void *operator new[](size_t size, std::align_val_t align, std::nothrow_t const&)
102 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR); }
104 #else // SANITIZER_MAC
105 INTERCEPTOR(void *, _Znwm, size_t size) {
106 OPERATOR_NEW_BODY(FROM_NEW);
108 INTERCEPTOR(void *, _Znam, size_t size) {
109 OPERATOR_NEW_BODY(FROM_NEW_BR);
111 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
112 OPERATOR_NEW_BODY(FROM_NEW);
114 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
115 OPERATOR_NEW_BODY(FROM_NEW_BR);
119 #define OPERATOR_DELETE_BODY(type) \
120 GET_STACK_TRACE_FREE;\
121 asan_free(ptr, &stack, type);
124 CXX_OPERATOR_ATTRIBUTE
125 void operator delete(void *ptr) NOEXCEPT {
126 OPERATOR_DELETE_BODY(FROM_NEW);
128 CXX_OPERATOR_ATTRIBUTE
129 void operator delete[](void *ptr) NOEXCEPT {
130 OPERATOR_DELETE_BODY(FROM_NEW_BR);
132 CXX_OPERATOR_ATTRIBUTE
133 void operator delete(void *ptr, std::nothrow_t const&) {
134 OPERATOR_DELETE_BODY(FROM_NEW);
136 CXX_OPERATOR_ATTRIBUTE
137 void operator delete[](void *ptr, std::nothrow_t const&) {
138 OPERATOR_DELETE_BODY(FROM_NEW_BR);
140 CXX_OPERATOR_ATTRIBUTE
141 void operator delete(void *ptr, size_t size) NOEXCEPT {
142 GET_STACK_TRACE_FREE;
143 asan_sized_free(ptr, size, &stack, FROM_NEW);
145 CXX_OPERATOR_ATTRIBUTE
146 void operator delete[](void *ptr, size_t size) NOEXCEPT {
147 GET_STACK_TRACE_FREE;
148 asan_sized_free(ptr, size, &stack, FROM_NEW_BR);
150 CXX_OPERATOR_ATTRIBUTE
151 void operator delete(void *ptr, std::align_val_t) NOEXCEPT {
152 OPERATOR_DELETE_BODY(FROM_NEW);
154 CXX_OPERATOR_ATTRIBUTE
155 void operator delete[](void *ptr, std::align_val_t) NOEXCEPT {
156 OPERATOR_DELETE_BODY(FROM_NEW_BR);
158 CXX_OPERATOR_ATTRIBUTE
159 void operator delete(void *ptr, std::align_val_t, std::nothrow_t const&) {
160 OPERATOR_DELETE_BODY(FROM_NEW);
162 CXX_OPERATOR_ATTRIBUTE
163 void operator delete[](void *ptr, std::align_val_t, std::nothrow_t const&) {
164 OPERATOR_DELETE_BODY(FROM_NEW_BR);
166 CXX_OPERATOR_ATTRIBUTE
167 void operator delete(void *ptr, size_t size, std::align_val_t) NOEXCEPT {
168 GET_STACK_TRACE_FREE;
169 asan_sized_free(ptr, size, &stack, FROM_NEW);
171 CXX_OPERATOR_ATTRIBUTE
172 void operator delete[](void *ptr, size_t size, std::align_val_t) NOEXCEPT {
173 GET_STACK_TRACE_FREE;
174 asan_sized_free(ptr, size, &stack, FROM_NEW_BR);
177 #else // SANITIZER_MAC
178 INTERCEPTOR(void, _ZdlPv, void *ptr) {
179 OPERATOR_DELETE_BODY(FROM_NEW);
181 INTERCEPTOR(void, _ZdaPv, void *ptr) {
182 OPERATOR_DELETE_BODY(FROM_NEW_BR);
184 INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
185 OPERATOR_DELETE_BODY(FROM_NEW);
187 INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
188 OPERATOR_DELETE_BODY(FROM_NEW_BR);