1 //===-- asan_interceptors.cpp ---------------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 // This file is a part of AddressSanitizer, an address sanity checker.
11 // Interceptors for operators new and delete.
12 //===----------------------------------------------------------------------===//
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"
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))
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[]
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[]
46 #define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
49 using namespace __asan
;
51 // FreeBSD prior v9.2 have wrong definition of 'size_t'.
52 // http://svnweb.freebsd.org/base?view=revision&revision=232261
53 #if SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
54 #include <sys/param.h>
55 #if __FreeBSD_version <= 902001 // v9.2
56 #define size_t unsigned
57 #endif // __FreeBSD_version
58 #endif // SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
60 // This code has issues on OSX.
61 // See https://github.com/google/sanitizers/issues/131.
63 // Fake std::nothrow_t and std::align_val_t to avoid including <new>.
66 enum class align_val_t
: size_t {};
69 // TODO(alekseyshl): throw std::bad_alloc instead of dying on OOM.
70 // For local pool allocation, align to SHADOW_GRANULARITY to match asan
71 // allocator behavior.
72 #define OPERATOR_NEW_BODY(type, nothrow) \
73 GET_STACK_TRACE_MALLOC; \
74 void *res = asan_memalign(0, size, &stack, type); \
75 if (!nothrow && UNLIKELY(!res)) \
76 ReportOutOfMemory(size, &stack); \
78 #define OPERATOR_NEW_BODY_ALIGN(type, nothrow) \
79 GET_STACK_TRACE_MALLOC; \
80 void *res = asan_memalign((uptr)align, size, &stack, type); \
81 if (!nothrow && UNLIKELY(!res)) \
82 ReportOutOfMemory(size, &stack); \
85 // On OS X it's not enough to just provide our own 'operator new' and
86 // 'operator delete' implementations, because they're going to be in the
87 // runtime dylib, and the main executable will depend on both the runtime
88 // dylib and libstdc++, each of those'll have its implementation of new and
90 // To make sure that C++ allocation/deallocation operators are overridden on
91 // OS X we need to intercept them using their mangled names.
93 CXX_OPERATOR_ATTRIBUTE
94 void *operator new(size_t size
)
95 { OPERATOR_NEW_BODY(FROM_NEW
, false /*nothrow*/); }
96 CXX_OPERATOR_ATTRIBUTE
97 void *operator new[](size_t size
)
98 { OPERATOR_NEW_BODY(FROM_NEW_BR
, false /*nothrow*/); }
99 CXX_OPERATOR_ATTRIBUTE
100 void *operator new(size_t size
, std::nothrow_t
const&)
101 { OPERATOR_NEW_BODY(FROM_NEW
, true /*nothrow*/); }
102 CXX_OPERATOR_ATTRIBUTE
103 void *operator new[](size_t size
, std::nothrow_t
const&)
104 { OPERATOR_NEW_BODY(FROM_NEW_BR
, true /*nothrow*/); }
105 CXX_OPERATOR_ATTRIBUTE
106 void *operator new(size_t size
, std::align_val_t align
)
107 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW
, false /*nothrow*/); }
108 CXX_OPERATOR_ATTRIBUTE
109 void *operator new[](size_t size
, std::align_val_t align
)
110 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR
, false /*nothrow*/); }
111 CXX_OPERATOR_ATTRIBUTE
112 void *operator new(size_t size
, std::align_val_t align
, std::nothrow_t
const&)
113 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW
, true /*nothrow*/); }
114 CXX_OPERATOR_ATTRIBUTE
115 void *operator new[](size_t size
, std::align_val_t align
, std::nothrow_t
const&)
116 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR
, true /*nothrow*/); }
118 #else // SANITIZER_MAC
119 INTERCEPTOR(void *, _Znwm
, size_t size
) {
120 OPERATOR_NEW_BODY(FROM_NEW
, false /*nothrow*/);
122 INTERCEPTOR(void *, _Znam
, size_t size
) {
123 OPERATOR_NEW_BODY(FROM_NEW_BR
, false /*nothrow*/);
125 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t
, size_t size
, std::nothrow_t
const&) {
126 OPERATOR_NEW_BODY(FROM_NEW
, true /*nothrow*/);
128 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t
, size_t size
, std::nothrow_t
const&) {
129 OPERATOR_NEW_BODY(FROM_NEW_BR
, true /*nothrow*/);
131 #endif // !SANITIZER_MAC
133 #define OPERATOR_DELETE_BODY(type) \
134 GET_STACK_TRACE_FREE; \
135 asan_delete(ptr, 0, 0, &stack, type);
137 #define OPERATOR_DELETE_BODY_SIZE(type) \
138 GET_STACK_TRACE_FREE; \
139 asan_delete(ptr, size, 0, &stack, type);
141 #define OPERATOR_DELETE_BODY_ALIGN(type) \
142 GET_STACK_TRACE_FREE; \
143 asan_delete(ptr, 0, static_cast<uptr>(align), &stack, type);
145 #define OPERATOR_DELETE_BODY_SIZE_ALIGN(type) \
146 GET_STACK_TRACE_FREE; \
147 asan_delete(ptr, size, static_cast<uptr>(align), &stack, type);
150 CXX_OPERATOR_ATTRIBUTE
151 void operator delete(void *ptr
) NOEXCEPT
152 { OPERATOR_DELETE_BODY(FROM_NEW
); }
153 CXX_OPERATOR_ATTRIBUTE
154 void operator delete[](void *ptr
) NOEXCEPT
155 { OPERATOR_DELETE_BODY(FROM_NEW_BR
); }
156 CXX_OPERATOR_ATTRIBUTE
157 void operator delete(void *ptr
, std::nothrow_t
const&)
158 { OPERATOR_DELETE_BODY(FROM_NEW
); }
159 CXX_OPERATOR_ATTRIBUTE
160 void operator delete[](void *ptr
, std::nothrow_t
const&)
161 { OPERATOR_DELETE_BODY(FROM_NEW_BR
); }
162 CXX_OPERATOR_ATTRIBUTE
163 void operator delete(void *ptr
, size_t size
) NOEXCEPT
164 { OPERATOR_DELETE_BODY_SIZE(FROM_NEW
); }
165 CXX_OPERATOR_ATTRIBUTE
166 void operator delete[](void *ptr
, size_t size
) NOEXCEPT
167 { OPERATOR_DELETE_BODY_SIZE(FROM_NEW_BR
); }
168 CXX_OPERATOR_ATTRIBUTE
169 void operator delete(void *ptr
, std::align_val_t align
) NOEXCEPT
170 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW
); }
171 CXX_OPERATOR_ATTRIBUTE
172 void operator delete[](void *ptr
, std::align_val_t align
) NOEXCEPT
173 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR
); }
174 CXX_OPERATOR_ATTRIBUTE
175 void operator delete(void *ptr
, std::align_val_t align
, std::nothrow_t
const&)
176 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW
); }
177 CXX_OPERATOR_ATTRIBUTE
178 void operator delete[](void *ptr
, std::align_val_t align
, std::nothrow_t
const&)
179 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR
); }
180 CXX_OPERATOR_ATTRIBUTE
181 void operator delete(void *ptr
, size_t size
, std::align_val_t align
) NOEXCEPT
182 { OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW
); }
183 CXX_OPERATOR_ATTRIBUTE
184 void operator delete[](void *ptr
, size_t size
, std::align_val_t align
) NOEXCEPT
185 { OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW_BR
); }
187 #else // SANITIZER_MAC
188 INTERCEPTOR(void, _ZdlPv
, void *ptr
)
189 { OPERATOR_DELETE_BODY(FROM_NEW
); }
190 INTERCEPTOR(void, _ZdaPv
, void *ptr
)
191 { OPERATOR_DELETE_BODY(FROM_NEW_BR
); }
192 INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t
, void *ptr
, std::nothrow_t
const&)
193 { OPERATOR_DELETE_BODY(FROM_NEW
); }
194 INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t
, void *ptr
, std::nothrow_t
const&)
195 { OPERATOR_DELETE_BODY(FROM_NEW_BR
); }
196 #endif // !SANITIZER_MAC