asan_new_delete.cc revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
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
30using 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>.
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) throw() {
94  OPERATOR_DELETE_BODY(FROM_NEW);
95}
96CXX_OPERATOR_ATTRIBUTE
97void operator delete[](void *ptr) throw() {
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}
108
109#else  // SANITIZER_MAC
110INTERCEPTOR(void, _ZdlPv, void *ptr) {
111  OPERATOR_DELETE_BODY(FROM_NEW);
112}
113INTERCEPTOR(void, _ZdaPv, void *ptr) {
114  OPERATOR_DELETE_BODY(FROM_NEW_BR);
115}
116INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
117  OPERATOR_DELETE_BODY(FROM_NEW);
118}
119INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
120  OPERATOR_DELETE_BODY(FROM_NEW_BR);
121}
122#endif
123