llvm-project

1
//===-- asan_interceptors.cpp ---------------------------------------------===//
2
//
3
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4
// See https://llvm.org/LICENSE.txt for license information.
5
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6
//
7
//===----------------------------------------------------------------------===//
8
//
9
// This file is a part of AddressSanitizer, an address sanity checker.
10
//
11
// Interceptors for operators new and delete.
12
//===----------------------------------------------------------------------===//
13

14
#include <stddef.h>
15

16
#include "asan_allocator.h"
17
#include "asan_internal.h"
18
#include "asan_report.h"
19
#include "asan_stack.h"
20
#include "interception/interception.h"
21

22
// C++ operators can't have dllexport attributes on Windows. We export them
23
// anyway by passing extra -export flags to the linker, which is exactly that
24
// dllexport would normally do. We need to export them in order to make the
25
// VS2015 dynamic CRT (MD) work.
26
#if SANITIZER_WINDOWS && defined(_MSC_VER)
27
#define CXX_OPERATOR_ATTRIBUTE
28
#define COMMENT_EXPORT(sym) __pragma(comment(linker, "/export:" sym))
29
#ifdef _WIN64
30
COMMENT_EXPORT("??2@YAPEAX_K@Z")                     // operator new
31
COMMENT_EXPORT("??2@YAPEAX_KAEBUnothrow_t@std@@@Z")  // operator new nothrow
32
COMMENT_EXPORT("??3@YAXPEAX@Z")                      // operator delete
33
COMMENT_EXPORT("??3@YAXPEAX_K@Z")                    // sized operator delete
34
COMMENT_EXPORT("??_U@YAPEAX_K@Z")                    // operator new[]
35
COMMENT_EXPORT("??_V@YAXPEAX@Z")                     // operator delete[]
36
#else
37
COMMENT_EXPORT("??2@YAPAXI@Z")                    // operator new
38
COMMENT_EXPORT("??2@YAPAXIABUnothrow_t@std@@@Z")  // operator new nothrow
39
COMMENT_EXPORT("??3@YAXPAX@Z")                    // operator delete
40
COMMENT_EXPORT("??3@YAXPAXI@Z")                   // sized operator delete
41
COMMENT_EXPORT("??_U@YAPAXI@Z")                   // operator new[]
42
COMMENT_EXPORT("??_V@YAXPAX@Z")                   // operator delete[]
43
#endif
44
#undef COMMENT_EXPORT
45
#else
46
#define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
47
#endif
48

49
using namespace __asan;
50

51
// This code has issues on OSX.
52
// See https://github.com/google/sanitizers/issues/131.
53

54
// Fake std::nothrow_t and std::align_val_t to avoid including <new>.
55
namespace std {
56
struct nothrow_t {};
57
enum class align_val_t: size_t {};
58
}  // namespace std
59

60
// TODO(alekseyshl): throw std::bad_alloc instead of dying on OOM.
61
// For local pool allocation, align to SHADOW_GRANULARITY to match asan
62
// allocator behavior.
63
#define OPERATOR_NEW_BODY(type, nothrow)            \
64
  GET_STACK_TRACE_MALLOC;                           \
65
  void *res = asan_memalign(0, size, &stack, type); \
66
  if (!nothrow && UNLIKELY(!res))                   \
67
    ReportOutOfMemory(size, &stack);                \
68
  return res;
69
#define OPERATOR_NEW_BODY_ALIGN(type, nothrow)                \
70
  GET_STACK_TRACE_MALLOC;                                     \
71
  void *res = asan_memalign((uptr)align, size, &stack, type); \
72
  if (!nothrow && UNLIKELY(!res))                             \
73
    ReportOutOfMemory(size, &stack);                          \
74
  return res;
75

76
// On OS X it's not enough to just provide our own 'operator new' and
77
// 'operator delete' implementations, because they're going to be in the
78
// runtime dylib, and the main executable will depend on both the runtime
79
// dylib and libstdc++, each of those'll have its implementation of new and
80
// delete.
81
// To make sure that C++ allocation/deallocation operators are overridden on
82
// OS X we need to intercept them using their mangled names.
83
#if !SANITIZER_APPLE
84
CXX_OPERATOR_ATTRIBUTE
85
void *operator new(size_t size)
86
{ OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/); }
87
CXX_OPERATOR_ATTRIBUTE
88
void *operator new[](size_t size)
89
{ OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/); }
90
CXX_OPERATOR_ATTRIBUTE
91
void *operator new(size_t size, std::nothrow_t const&)
92
{ OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/); }
93
CXX_OPERATOR_ATTRIBUTE
94
void *operator new[](size_t size, std::nothrow_t const&)
95
{ OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/); }
96
CXX_OPERATOR_ATTRIBUTE
97
void *operator new(size_t size, std::align_val_t align)
98
{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW, false /*nothrow*/); }
99
CXX_OPERATOR_ATTRIBUTE
100
void *operator new[](size_t size, std::align_val_t align)
101
{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, false /*nothrow*/); }
102
CXX_OPERATOR_ATTRIBUTE
103
void *operator new(size_t size, std::align_val_t align, std::nothrow_t const&)
104
{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW, true /*nothrow*/); }
105
CXX_OPERATOR_ATTRIBUTE
106
void *operator new[](size_t size, std::align_val_t align, std::nothrow_t const&)
107
{ OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, true /*nothrow*/); }
108

109
#else  // SANITIZER_APPLE
110
INTERCEPTOR(void *, _Znwm, size_t size) {
111
  OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/);
112
}
113
INTERCEPTOR(void *, _Znam, size_t size) {
114
  OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/);
115
}
116
INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
117
  OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/);
118
}
119
INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
120
  OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/);
121
}
122
#endif  // !SANITIZER_APPLE
123

124
#define OPERATOR_DELETE_BODY(type) \
125
  GET_STACK_TRACE_FREE;            \
126
  asan_delete(ptr, 0, 0, &stack, type);
127

128
#define OPERATOR_DELETE_BODY_SIZE(type) \
129
  GET_STACK_TRACE_FREE;                 \
130
  asan_delete(ptr, size, 0, &stack, type);
131

132
#define OPERATOR_DELETE_BODY_ALIGN(type) \
133
  GET_STACK_TRACE_FREE;                  \
134
  asan_delete(ptr, 0, static_cast<uptr>(align), &stack, type);
135

136
#define OPERATOR_DELETE_BODY_SIZE_ALIGN(type) \
137
  GET_STACK_TRACE_FREE;                       \
138
  asan_delete(ptr, size, static_cast<uptr>(align), &stack, type);
139

140
#if !SANITIZER_APPLE
141
CXX_OPERATOR_ATTRIBUTE
142
void operator delete(void *ptr) NOEXCEPT
143
{ OPERATOR_DELETE_BODY(FROM_NEW); }
144
CXX_OPERATOR_ATTRIBUTE
145
void operator delete[](void *ptr) NOEXCEPT
146
{ OPERATOR_DELETE_BODY(FROM_NEW_BR); }
147
CXX_OPERATOR_ATTRIBUTE
148
void operator delete(void *ptr, std::nothrow_t const&)
149
{ OPERATOR_DELETE_BODY(FROM_NEW); }
150
CXX_OPERATOR_ATTRIBUTE
151
void operator delete[](void *ptr, std::nothrow_t const&)
152
{ OPERATOR_DELETE_BODY(FROM_NEW_BR); }
153
CXX_OPERATOR_ATTRIBUTE
154
void operator delete(void *ptr, size_t size) NOEXCEPT
155
{ OPERATOR_DELETE_BODY_SIZE(FROM_NEW); }
156
CXX_OPERATOR_ATTRIBUTE
157
void operator delete[](void *ptr, size_t size) NOEXCEPT
158
{ OPERATOR_DELETE_BODY_SIZE(FROM_NEW_BR); }
159
CXX_OPERATOR_ATTRIBUTE
160
void operator delete(void *ptr, std::align_val_t align) NOEXCEPT
161
{ OPERATOR_DELETE_BODY_ALIGN(FROM_NEW); }
162
CXX_OPERATOR_ATTRIBUTE
163
void operator delete[](void *ptr, std::align_val_t align) NOEXCEPT
164
{ OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR); }
165
CXX_OPERATOR_ATTRIBUTE
166
void operator delete(void *ptr, std::align_val_t align, std::nothrow_t const&)
167
{ OPERATOR_DELETE_BODY_ALIGN(FROM_NEW); }
168
CXX_OPERATOR_ATTRIBUTE
169
void operator delete[](void *ptr, std::align_val_t align, std::nothrow_t const&)
170
{ OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR); }
171
CXX_OPERATOR_ATTRIBUTE
172
void operator delete(void *ptr, size_t size, std::align_val_t align) NOEXCEPT
173
{ OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW); }
174
CXX_OPERATOR_ATTRIBUTE
175
void operator delete[](void *ptr, size_t size, std::align_val_t align) NOEXCEPT
176
{ OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW_BR); }
177

178
#else  // SANITIZER_APPLE
179
INTERCEPTOR(void, _ZdlPv, void *ptr)
180
{ OPERATOR_DELETE_BODY(FROM_NEW); }
181
INTERCEPTOR(void, _ZdaPv, void *ptr)
182
{ OPERATOR_DELETE_BODY(FROM_NEW_BR); }
183
INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&)
184
{ OPERATOR_DELETE_BODY(FROM_NEW); }
185
INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&)
186
{ OPERATOR_DELETE_BODY(FROM_NEW_BR); }
187
#endif  // !SANITIZER_APPLE
188