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 // 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
59 
60 // This code has issues on OSX.
61 // See https://github.com/google/sanitizers/issues/131.
62 
63 // Fake std::nothrow_t and std::align_val_t to avoid including <new>.
64 namespace std {
65 struct nothrow_t {};
66 enum class align_val_t: size_t {};
67 }  // namespace std
68 
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);                \
77   return res;
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);                          \
83   return res;
84 
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
89 // delete.
90 // To make sure that C++ allocation/deallocation operators are overridden on
91 // OS X we need to intercept them using their mangled names.
92 #if !SANITIZER_APPLE
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*/); }
117 
118 #else  // SANITIZER_APPLE
119 INTERCEPTOR(void *, _Znwm, size_t size) {
120   OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/);
121 }
122 INTERCEPTOR(void *, _Znam, size_t size) {
123   OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/);
124 }
125 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
126   OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/);
127 }
128 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
129   OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/);
130 }
131 #endif  // !SANITIZER_APPLE
132 
133 #define OPERATOR_DELETE_BODY(type) \
134   GET_STACK_TRACE_FREE;            \
135   asan_delete(ptr, 0, 0, &stack, type);
136 
137 #define OPERATOR_DELETE_BODY_SIZE(type) \
138   GET_STACK_TRACE_FREE;                 \
139   asan_delete(ptr, size, 0, &stack, type);
140 
141 #define OPERATOR_DELETE_BODY_ALIGN(type) \
142   GET_STACK_TRACE_FREE;                  \
143   asan_delete(ptr, 0, static_cast<uptr>(align), &stack, type);
144 
145 #define OPERATOR_DELETE_BODY_SIZE_ALIGN(type) \
146   GET_STACK_TRACE_FREE;                       \
147   asan_delete(ptr, size, static_cast<uptr>(align), &stack, type);
148 
149 #if !SANITIZER_APPLE
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); }
186 
187 #else  // SANITIZER_APPLE
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_APPLE
197