libsanitizer/asan/asan_new_delete.cc

   1 //===-- asan_interceptors.cc ----------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of AddressSanitizer, an address sanity checker.
   9 //
  10 // Interceptors for operators new and delete.
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "asan_allocator.h"
  14 #include "asan_internal.h"
  15 #include "asan_malloc_local.h"
  16 #include "asan_report.h"
  17 #include "asan_stack.h"
  18
  19 #include "interception/interception.h"
  20
  21 #include <stddef.h>
  22
  23 // C++ operators can't have dllexport attributes on Windows. We export them
  24 // anyway by passing extra -export flags to the linker, which is exactly that
  25 // dllexport would normally do. We need to export them in order to make the
  26 // VS2015 dynamic CRT (MD) work.
  27 #if SANITIZER_WINDOWS && defined(_MSC_VER)
  28 #define CXX_OPERATOR_ATTRIBUTE
  29 #define COMMENT_EXPORT(sym) __pragma(comment(linker, "/export:" sym))
  30 #ifdef _WIN64
  31 COMMENT_EXPORT("??2@YAPEAX_K@Z")                     // operator new
  32 COMMENT_EXPORT("??2@YAPEAX_KAEBUnothrow_t@std@@@Z")  // operator new nothrow
  33 COMMENT_EXPORT("??3@YAXPEAX@Z")                      // operator delete
  34 COMMENT_EXPORT("??3@YAXPEAX_K@Z")                    // sized operator delete
  35 COMMENT_EXPORT("??_U@YAPEAX_K@Z")                    // operator new[]
  36 COMMENT_EXPORT("??_V@YAXPEAX@Z")                     // operator delete[]
  37 #else
  38 COMMENT_EXPORT("??2@YAPAXI@Z")                    // operator new
  39 COMMENT_EXPORT("??2@YAPAXIABUnothrow_t@std@@@Z")  // operator new nothrow
  40 COMMENT_EXPORT("??3@YAXPAX@Z")                    // operator delete
  41 COMMENT_EXPORT("??3@YAXPAXI@Z")                   // sized operator delete
  42 COMMENT_EXPORT("??_U@YAPAXI@Z")                   // operator new[]
  43 COMMENT_EXPORT("??_V@YAXPAX@Z")                   // operator delete[]
  44 #endif
  45 #undef COMMENT_EXPORT
  46 #else
  47 #define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE
  48 #endif
  49
  50 using namespace __asan;  // NOLINT
  51
  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
  61 // This code has issues on OSX.
  62 // See https://github.com/google/sanitizers/issues/131.
  63
  64 // Fake std::nothrow_t and std::align_val_t to avoid including <new>.
  65 namespace std {
  66 struct nothrow_t {};
  67 enum class align_val_t: size_t {};
  68 }  // namespace std
  69
  70 // TODO(alekseyshl): throw std::bad_alloc instead of dying on OOM.
  71 // For local pool allocation, align to SHADOW_GRANULARITY to match asan
  72 // allocator behavior.
  73 #define OPERATOR_NEW_BODY(type, nothrow) \
  74   if (ALLOCATE_FROM_LOCAL_POOL) {\
  75     void *res = MemalignFromLocalPool(SHADOW_GRANULARITY, size);\
  76     if (!nothrow) CHECK(res);\
  77     return res;\
  78   }\
  79   GET_STACK_TRACE_MALLOC;\
  80   void *res = asan_memalign(0, size, &stack, type);\
  81   if (!nothrow && UNLIKELY(!res)) ReportOutOfMemory(size, &stack);\
  82   return res;
  83 #define OPERATOR_NEW_BODY_ALIGN(type, nothrow) \
  84   if (ALLOCATE_FROM_LOCAL_POOL) {\
  85     void *res = MemalignFromLocalPool((uptr)align, size);\
  86     if (!nothrow) CHECK(res);\
  87     return res;\
  88   }\
  89   GET_STACK_TRACE_MALLOC;\
  90   void *res = asan_memalign((uptr)align, size, &stack, type);\
  91   if (!nothrow && UNLIKELY(!res)) ReportOutOfMemory(size, &stack);\
  92   return res;
  93
  94 // On OS X it's not enough to just provide our own 'operator new' and
  95 // 'operator delete' implementations, because they're going to be in the
  96 // runtime dylib, and the main executable will depend on both the runtime
  97 // dylib and libstdc++, each of those'll have its implementation of new and
  98 // delete.
  99 // To make sure that C++ allocation/deallocation operators are overridden on
 100 // OS X we need to intercept them using their mangled names.
 101 #if !SANITIZER_MAC
 102 CXX_OPERATOR_ATTRIBUTE
 103 void *operator new(size_t size)
 104 { OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/); }
 105 CXX_OPERATOR_ATTRIBUTE
 106 void *operator new[](size_t size)
 107 { OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/); }
 108 CXX_OPERATOR_ATTRIBUTE
 109 void *operator new(size_t size, std::nothrow_t const&)
 110 { OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/); }
 111 CXX_OPERATOR_ATTRIBUTE
 112 void *operator new[](size_t size, std::nothrow_t const&)
 113 { OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/); }
 114 CXX_OPERATOR_ATTRIBUTE
 115 void *operator new(size_t size, std::align_val_t align)
 116 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW, false /*nothrow*/); }
 117 CXX_OPERATOR_ATTRIBUTE
 118 void *operator new[](size_t size, std::align_val_t align)
 119 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, false /*nothrow*/); }
 120 CXX_OPERATOR_ATTRIBUTE
 121 void *operator new(size_t size, std::align_val_t align, std::nothrow_t const&)
 122 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW, true /*nothrow*/); }
 123 CXX_OPERATOR_ATTRIBUTE
 124 void *operator new[](size_t size, std::align_val_t align, std::nothrow_t const&)
 125 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, true /*nothrow*/); }
 126
 127 #else  // SANITIZER_MAC
 128 INTERCEPTOR(void *, _Znwm, size_t size) {
 129   OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/);
 130 }
 131 INTERCEPTOR(void *, _Znam, size_t size) {
 132   OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/);
 133 }
 134 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
 135   OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/);
 136 }
 137 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
 138   OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/);
 139 }
 140 #endif  // !SANITIZER_MAC
 141
 142 #define OPERATOR_DELETE_BODY(type) \
 143   if (IS_FROM_LOCAL_POOL(ptr)) return;\
 144   GET_STACK_TRACE_FREE;\
 145   asan_delete(ptr, 0, 0, &stack, type);
 146
 147 #define OPERATOR_DELETE_BODY_SIZE(type) \
 148   if (IS_FROM_LOCAL_POOL(ptr)) return;\
 149   GET_STACK_TRACE_FREE;\
 150   asan_delete(ptr, size, 0, &stack, type);
 151
 152 #define OPERATOR_DELETE_BODY_ALIGN(type) \
 153   if (IS_FROM_LOCAL_POOL(ptr)) return;\
 154   GET_STACK_TRACE_FREE;\
 155   asan_delete(ptr, 0, static_cast<uptr>(align), &stack, type);
 156
 157 #define OPERATOR_DELETE_BODY_SIZE_ALIGN(type) \
 158   if (IS_FROM_LOCAL_POOL(ptr)) return;\
 159   GET_STACK_TRACE_FREE;\
 160   asan_delete(ptr, size, static_cast<uptr>(align), &stack, type);
 161
 162 #if !SANITIZER_MAC
 163 CXX_OPERATOR_ATTRIBUTE
 164 void operator delete(void *ptr) NOEXCEPT
 165 { OPERATOR_DELETE_BODY(FROM_NEW); }
 166 CXX_OPERATOR_ATTRIBUTE
 167 void operator delete[](void *ptr) NOEXCEPT
 168 { OPERATOR_DELETE_BODY(FROM_NEW_BR); }
 169 CXX_OPERATOR_ATTRIBUTE
 170 void operator delete(void *ptr, std::nothrow_t const&)
 171 { OPERATOR_DELETE_BODY(FROM_NEW); }
 172 CXX_OPERATOR_ATTRIBUTE
 173 void operator delete[](void *ptr, std::nothrow_t const&)
 174 { OPERATOR_DELETE_BODY(FROM_NEW_BR); }
 175 CXX_OPERATOR_ATTRIBUTE
 176 void operator delete(void *ptr, size_t size) NOEXCEPT
 177 { OPERATOR_DELETE_BODY_SIZE(FROM_NEW); }
 178 CXX_OPERATOR_ATTRIBUTE
 179 void operator delete[](void *ptr, size_t size) NOEXCEPT
 180 { OPERATOR_DELETE_BODY_SIZE(FROM_NEW_BR); }
 181 CXX_OPERATOR_ATTRIBUTE
 182 void operator delete(void *ptr, std::align_val_t align) NOEXCEPT
 183 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW); }
 184 CXX_OPERATOR_ATTRIBUTE
 185 void operator delete[](void *ptr, std::align_val_t align) NOEXCEPT
 186 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR); }
 187 CXX_OPERATOR_ATTRIBUTE
 188 void operator delete(void *ptr, std::align_val_t align, std::nothrow_t const&)
 189 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW); }
 190 CXX_OPERATOR_ATTRIBUTE
 191 void operator delete[](void *ptr, std::align_val_t align, std::nothrow_t const&)
 192 { OPERATOR_DELETE_BODY_ALIGN(FROM_NEW_BR); }
 193 CXX_OPERATOR_ATTRIBUTE
 194 void operator delete(void *ptr, size_t size, std::align_val_t align) NOEXCEPT
 195 { OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW); }
 196 CXX_OPERATOR_ATTRIBUTE
 197 void operator delete[](void *ptr, size_t size, std::align_val_t align) NOEXCEPT
 198 { OPERATOR_DELETE_BODY_SIZE_ALIGN(FROM_NEW_BR); }
 199
 200 #else  // SANITIZER_MAC
 201 INTERCEPTOR(void, _ZdlPv, void *ptr)
 202 { OPERATOR_DELETE_BODY(FROM_NEW); }
 203 INTERCEPTOR(void, _ZdaPv, void *ptr)
 204 { OPERATOR_DELETE_BODY(FROM_NEW_BR); }
 205 INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&)
 206 { OPERATOR_DELETE_BODY(FROM_NEW); }
 207 INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&)
 208 { OPERATOR_DELETE_BODY(FROM_NEW_BR); }
 209 #endif  // !SANITIZER_MAC