asan_new_delete.cc revision 1.6 
1//===-- asan_interceptors.cc ----------------------------------------------===//
2//
3// This file is distributed under the University of Illinois Open Source
4// License. See LICENSE.TXT for details.
5//
6//===----------------------------------------------------------------------===//
7//
8// This file is a part of AddressSanitizer, an address sanity checker.
9//
10// Interceptors for operators new and delete.
11//===----------------------------------------------------------------------===//
12
13#include "asan_allocator.h"
14#include "asan_internal.h"
15#include "asan_stack.h"
16
17#include "interception/interception.h"
18
19#include <stddef.h>
20
21// C++ operators can't have dllexport attributes on Windows. We export them
22// anyway by passing extra -export flags to the linker, which is exactly that
23// dllexport would normally do. We need to export them in order to make the
24// VS2015 dynamic CRT (MD) work.
25#if SANITIZER_WINDOWS
26# define CXX_OPERATOR_ATTRIBUTE
27# ifdef _WIN64
28#  pragma comment(linker, "/export:??2@YAPEAX_K@Z")   // operator new
29#  pragma comment(linker, "/export:??3@YAXPEAX@Z")    // operator delete
30#  pragma comment(linker, "/export:??3@YAXPEAX_K@Z")  // sized operator delete
31#  pragma comment(linker, "/export:??_U@YAPEAX_K@Z")  // operator new[]
32#  pragma comment(linker, "/export:??_V@YAXPEAX@Z")   // operator delete[]
33# else
34#  pragma comment(linker, "/export:??2@YAPAXI@Z")   // operator new
35#  pragma comment(linker, "/export:??3@YAXPAX@Z")   // operator delete
36#  pragma comment(linker, "/export:??3@YAXPAXI@Z")  // sized operator delete
37#  pragma comment(linker, "/export:??_U@YAPAXI@Z")  // operator new[]
38#  pragma comment(linker, "/export:??_V@YAXPAX@Z")  // operator delete[]
39# endif
40#else
41# define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE
42#endif
43
44using namespace __asan;  // NOLINT
45
46// FreeBSD prior v9.2 have wrong definition of 'size_t'.
47// http://svnweb.freebsd.org/base?view=revision&revision=232261
48#if SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
49#include <sys/param.h>
50#if __FreeBSD_version <= 902001  // v9.2
51#define size_t unsigned
52#endif  // __FreeBSD_version
53#endif  // SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
54
55// This code has issues on OSX.
56// See https://github.com/google/sanitizers/issues/131.
57
58// Fake std::nothrow_t and std::align_val_t to avoid including <new>.
59namespace std {
60struct nothrow_t {};
61enum class align_val_t: size_t {};
62}  // namespace std
63
64#define OPERATOR_NEW_BODY(type) \
65  GET_STACK_TRACE_MALLOC;\
66  return asan_memalign(0, size, &stack, type);
67#define OPERATOR_NEW_BODY_ALIGN(type) \
68  GET_STACK_TRACE_MALLOC;\
69  return asan_memalign((uptr)align, size, &stack, type);
70
71// On OS X it's not enough to just provide our own 'operator new' and
72// 'operator delete' implementations, because they're going to be in the
73// runtime dylib, and the main executable will depend on both the runtime
74// dylib and libstdc++, each of those'll have its implementation of new and
75// delete.
76// To make sure that C++ allocation/deallocation operators are overridden on
77// OS X we need to intercept them using their mangled names.
78#if !SANITIZER_MAC
79CXX_OPERATOR_ATTRIBUTE
80void *operator new(size_t size) { OPERATOR_NEW_BODY(FROM_NEW); }
81CXX_OPERATOR_ATTRIBUTE
82void *operator new[](size_t size) { OPERATOR_NEW_BODY(FROM_NEW_BR); }
83CXX_OPERATOR_ATTRIBUTE
84void *operator new(size_t size, std::nothrow_t const&)
85{ OPERATOR_NEW_BODY(FROM_NEW); }
86CXX_OPERATOR_ATTRIBUTE
87void *operator new[](size_t size, std::nothrow_t const&)
88{ OPERATOR_NEW_BODY(FROM_NEW_BR); }
89CXX_OPERATOR_ATTRIBUTE
90void *operator new(size_t size, std::align_val_t align)
91{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW); }
92CXX_OPERATOR_ATTRIBUTE
93void *operator new[](size_t size, std::align_val_t align)
94{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR); }
95CXX_OPERATOR_ATTRIBUTE
96void *operator new(size_t size, std::align_val_t align, std::nothrow_t const&)
97{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW); }
98CXX_OPERATOR_ATTRIBUTE
99void *operator new[](size_t size, std::align_val_t align, std::nothrow_t const&)
100{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR); }
101
102#else  // SANITIZER_MAC
103INTERCEPTOR(void *, _Znwm, size_t size) {
104  OPERATOR_NEW_BODY(FROM_NEW);
105}
106INTERCEPTOR(void *, _Znam, size_t size) {
107  OPERATOR_NEW_BODY(FROM_NEW_BR);
108}
109INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
110  OPERATOR_NEW_BODY(FROM_NEW);
111}
112INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
113  OPERATOR_NEW_BODY(FROM_NEW_BR);
114}
115#endif
116
117#define OPERATOR_DELETE_BODY(type) \
118  GET_STACK_TRACE_FREE;\
119  asan_free(ptr, &stack, type);
120
121#if !SANITIZER_MAC
122CXX_OPERATOR_ATTRIBUTE
123void operator delete(void *ptr) NOEXCEPT {
124  OPERATOR_DELETE_BODY(FROM_NEW);
125}
126CXX_OPERATOR_ATTRIBUTE
127void operator delete[](void *ptr) NOEXCEPT {
128  OPERATOR_DELETE_BODY(FROM_NEW_BR);
129}
130CXX_OPERATOR_ATTRIBUTE
131void operator delete(void *ptr, std::nothrow_t const&) {
132  OPERATOR_DELETE_BODY(FROM_NEW);
133}
134CXX_OPERATOR_ATTRIBUTE
135void operator delete[](void *ptr, std::nothrow_t const&) {
136  OPERATOR_DELETE_BODY(FROM_NEW_BR);
137}
138CXX_OPERATOR_ATTRIBUTE
139void operator delete(void *ptr, size_t size) NOEXCEPT {
140  GET_STACK_TRACE_FREE;
141  asan_sized_free(ptr, size, &stack, FROM_NEW);
142}
143CXX_OPERATOR_ATTRIBUTE
144void operator delete[](void *ptr, size_t size) NOEXCEPT {
145  GET_STACK_TRACE_FREE;
146  asan_sized_free(ptr, size, &stack, FROM_NEW_BR);
147}
148CXX_OPERATOR_ATTRIBUTE
149void operator delete(void *ptr, std::align_val_t) NOEXCEPT {
150  OPERATOR_DELETE_BODY(FROM_NEW);
151}
152CXX_OPERATOR_ATTRIBUTE
153void operator delete[](void *ptr, std::align_val_t) NOEXCEPT {
154  OPERATOR_DELETE_BODY(FROM_NEW_BR);
155}
156CXX_OPERATOR_ATTRIBUTE
157void operator delete(void *ptr, std::align_val_t, std::nothrow_t const&) {
158  OPERATOR_DELETE_BODY(FROM_NEW);
159}
160CXX_OPERATOR_ATTRIBUTE
161void operator delete[](void *ptr, std::align_val_t, std::nothrow_t const&) {
162  OPERATOR_DELETE_BODY(FROM_NEW_BR);
163}
164CXX_OPERATOR_ATTRIBUTE
165void operator delete(void *ptr, size_t size, std::align_val_t) NOEXCEPT {
166  GET_STACK_TRACE_FREE;
167  asan_sized_free(ptr, size, &stack, FROM_NEW);
168}
169CXX_OPERATOR_ATTRIBUTE
170void operator delete[](void *ptr, size_t size, std::align_val_t) NOEXCEPT {
171  GET_STACK_TRACE_FREE;
172  asan_sized_free(ptr, size, &stack, FROM_NEW_BR);
173}
174
175#else  // SANITIZER_MAC
176INTERCEPTOR(void, _ZdlPv, void *ptr) {
177  OPERATOR_DELETE_BODY(FROM_NEW);
178}
179INTERCEPTOR(void, _ZdaPv, void *ptr) {
180  OPERATOR_DELETE_BODY(FROM_NEW_BR);
181}
182INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
183  OPERATOR_DELETE_BODY(FROM_NEW);
184}
185INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
186  OPERATOR_DELETE_BODY(FROM_NEW_BR);
187}
188#endif
189