1 //===-- asan_interceptors.cc ----------------------------------------------===//
3 // This file is distributed under the University of Illinois Open Source
4 // License. See LICENSE.TXT for details.
6 //===----------------------------------------------------------------------===//
8 // This file is a part of AddressSanitizer, an address sanity checker.
10 // Interceptors for operators new and delete.
11 //===----------------------------------------------------------------------===//
13 #include "asan_allocator.h"
14 #include "asan_internal.h"
15 #include "asan_stack.h"
17 #include "sanitizer_common/sanitizer_interception.h"
21 // C++ operators can't have visibility attributes on Windows.
23 # define CXX_OPERATOR_ATTRIBUTE
25 # define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE
28 using namespace __asan
; // NOLINT
30 // This code has issues on OSX.
31 // See https://code.google.com/p/address-sanitizer/issues/detail?id=131.
33 // Fake std::nothrow_t to avoid including <new>.
38 #define OPERATOR_NEW_BODY(type) \
39 GET_STACK_TRACE_MALLOC;\
40 return asan_memalign(0, size, &stack, type);
42 // On OS X it's not enough to just provide our own 'operator new' and
43 // 'operator delete' implementations, because they're going to be in the
44 // runtime dylib, and the main executable will depend on both the runtime
45 // dylib and libstdc++, each of those'll have its implementation of new and
47 // To make sure that C++ allocation/deallocation operators are overridden on
48 // OS X we need to intercept them using their mangled names.
50 // FreeBSD prior v9.2 have wrong definition of 'size_t'.
51 // http://svnweb.freebsd.org/base?view=revision&revision=232261
52 #if SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
53 #include <sys/param.h>
54 #if __FreeBSD_version <= 902001 // v9.2
55 #define size_t unsigned
56 #endif // __FreeBSD_version
57 #endif // SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
59 CXX_OPERATOR_ATTRIBUTE
60 void *operator new(size_t size
) { OPERATOR_NEW_BODY(FROM_NEW
); }
61 CXX_OPERATOR_ATTRIBUTE
62 void *operator new[](size_t size
) { OPERATOR_NEW_BODY(FROM_NEW_BR
); }
63 CXX_OPERATOR_ATTRIBUTE
64 void *operator new(size_t size
, std::nothrow_t
const&)
65 { OPERATOR_NEW_BODY(FROM_NEW
); }
66 CXX_OPERATOR_ATTRIBUTE
67 void *operator new[](size_t size
, std::nothrow_t
const&)
68 { OPERATOR_NEW_BODY(FROM_NEW_BR
); }
70 #else // SANITIZER_MAC
71 INTERCEPTOR(void *, _Znwm
, size_t size
) {
72 OPERATOR_NEW_BODY(FROM_NEW
);
74 INTERCEPTOR(void *, _Znam
, size_t size
) {
75 OPERATOR_NEW_BODY(FROM_NEW_BR
);
77 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t
, size_t size
, std::nothrow_t
const&) {
78 OPERATOR_NEW_BODY(FROM_NEW
);
80 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t
, size_t size
, std::nothrow_t
const&) {
81 OPERATOR_NEW_BODY(FROM_NEW_BR
);
85 #define OPERATOR_DELETE_BODY(type) \
86 GET_STACK_TRACE_FREE;\
87 asan_free(ptr, &stack, type);
90 CXX_OPERATOR_ATTRIBUTE
91 void operator delete(void *ptr
) throw() {
92 OPERATOR_DELETE_BODY(FROM_NEW
);
94 CXX_OPERATOR_ATTRIBUTE
95 void operator delete[](void *ptr
) throw() {
96 OPERATOR_DELETE_BODY(FROM_NEW_BR
);
98 CXX_OPERATOR_ATTRIBUTE
99 void operator delete(void *ptr
, std::nothrow_t
const&) {
100 OPERATOR_DELETE_BODY(FROM_NEW
);
102 CXX_OPERATOR_ATTRIBUTE
103 void operator delete[](void *ptr
, std::nothrow_t
const&) {
104 OPERATOR_DELETE_BODY(FROM_NEW_BR
);
106 CXX_OPERATOR_ATTRIBUTE
107 void operator delete(void *ptr
, size_t size
) throw() {
108 GET_STACK_TRACE_FREE
;
109 asan_sized_free(ptr
, size
, &stack
, FROM_NEW
);
111 CXX_OPERATOR_ATTRIBUTE
112 void operator delete[](void *ptr
, size_t size
) throw() {
113 GET_STACK_TRACE_FREE
;
114 asan_sized_free(ptr
, size
, &stack
, FROM_NEW_BR
);
117 #else // SANITIZER_MAC
118 INTERCEPTOR(void, _ZdlPv
, void *ptr
) {
119 OPERATOR_DELETE_BODY(FROM_NEW
);
121 INTERCEPTOR(void, _ZdaPv
, void *ptr
) {
122 OPERATOR_DELETE_BODY(FROM_NEW_BR
);
124 INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t
, void *ptr
, std::nothrow_t
const&) {
125 OPERATOR_DELETE_BODY(FROM_NEW
);
127 INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t
, void *ptr
, std::nothrow_t
const&) {
128 OPERATOR_DELETE_BODY(FROM_NEW_BR
);