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_stack.h"
  16
  17 #include "interception/interception.h"
  18
  19 #include <stddef.h>
  20
  21 // C++ operators can't have dllexport attributes on Windows. We export them
  22 // anyway by passing extra -export flags to the linker, which is exactly that
  23 // dllexport would normally do. We need to export them in order to make the
  24 // VS2015 dynamic CRT (MD) work.
  25 #if SANITIZER_WINDOWS
  26 #define CXX_OPERATOR_ATTRIBUTE
  27 #define COMMENT_EXPORT(sym) __pragma(comment(linker, "/export:" sym))
  28 #ifdef _WIN64
  29 COMMENT_EXPORT("??2@YAPEAX_K@Z")                     // operator new
  30 COMMENT_EXPORT("??2@YAPEAX_KAEBUnothrow_t@std@@@Z")  // operator new nothrow
  31 COMMENT_EXPORT("??3@YAXPEAX@Z")                      // operator delete
  32 COMMENT_EXPORT("??3@YAXPEAX_K@Z")                    // sized operator delete
  33 COMMENT_EXPORT("??_U@YAPEAX_K@Z")                    // operator new[]
  34 COMMENT_EXPORT("??_V@YAXPEAX@Z")                     // operator delete[]
  35 #else
  36 COMMENT_EXPORT("??2@YAPAXI@Z")                    // operator new
  37 COMMENT_EXPORT("??2@YAPAXIABUnothrow_t@std@@@Z")  // operator new nothrow
  38 COMMENT_EXPORT("??3@YAXPAX@Z")                    // operator delete
  39 COMMENT_EXPORT("??3@YAXPAXI@Z")                   // sized operator delete
  40 COMMENT_EXPORT("??_U@YAPAXI@Z")                   // operator new[]
  41 COMMENT_EXPORT("??_V@YAXPAX@Z")                   // operator delete[]
  42 #endif
  43 #undef COMMENT_EXPORT
  44 #else
  45 #define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE
  46 #endif
  47
  48 using namespace __asan;  // NOLINT
  49
  50 // FreeBSD prior v9.2 have wrong definition of 'size_t'.
  51 // http://svnweb.freebsd.org/base?view=revision&revision=232261
  52 #if SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
  53 #include <sys/param.h>
  54 #if __FreeBSD_version <= 902001  // v9.2
  55 #define size_t unsigned
  56 #endif  // __FreeBSD_version
  57 #endif  // SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
  58
  59 // This code has issues on OSX.
  60 // See https://github.com/google/sanitizers/issues/131.
  61
  62 // Fake std::nothrow_t and std::align_val_t to avoid including <new>.
  63 namespace std {
  64 struct nothrow_t {};
  65 enum class align_val_t: size_t {};
  66 }  // namespace std
  67
  68 // TODO(alekseys): throw std::bad_alloc instead of dying on OOM.
  69 #define OPERATOR_NEW_BODY(type, nothrow) \
  70   GET_STACK_TRACE_MALLOC;\
  71   void *res = asan_memalign(0, size, &stack, type);\
  72   if (!nothrow && UNLIKELY(!res)) DieOnFailure::OnOOM();\
  73   return res;
  74 #define OPERATOR_NEW_BODY_ALIGN(type, nothrow) \
  75   GET_STACK_TRACE_MALLOC;\
  76   void *res = asan_memalign((uptr)align, size, &stack, type);\
  77   if (!nothrow && UNLIKELY(!res)) DieOnFailure::OnOOM();\
  78   return res;
  79
  80 // On OS X it's not enough to just provide our own 'operator new' and
  81 // 'operator delete' implementations, because they're going to be in the
  82 // runtime dylib, and the main executable will depend on both the runtime
  83 // dylib and libstdc++, each of those'll have its implementation of new and
  84 // delete.
  85 // To make sure that C++ allocation/deallocation operators are overridden on
  86 // OS X we need to intercept them using their mangled names.
  87 #if !SANITIZER_MAC
  88 CXX_OPERATOR_ATTRIBUTE
  89 void *operator new(size_t size)
  90 { OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/); }
  91 CXX_OPERATOR_ATTRIBUTE
  92 void *operator new[](size_t size)
  93 { OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/); }
  94 CXX_OPERATOR_ATTRIBUTE
  95 void *operator new(size_t size, std::nothrow_t const&)
  96 { OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/); }
  97 CXX_OPERATOR_ATTRIBUTE
  98 void *operator new[](size_t size, std::nothrow_t const&)
  99 { OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/); }
 100 CXX_OPERATOR_ATTRIBUTE
 101 void *operator new(size_t size, std::align_val_t align)
 102 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW, false /*nothrow*/); }
 103 CXX_OPERATOR_ATTRIBUTE
 104 void *operator new[](size_t size, std::align_val_t align)
 105 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, false /*nothrow*/); }
 106 CXX_OPERATOR_ATTRIBUTE
 107 void *operator new(size_t size, std::align_val_t align, std::nothrow_t const&)
 108 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW, true /*nothrow*/); }
 109 CXX_OPERATOR_ATTRIBUTE
 110 void *operator new[](size_t size, std::align_val_t align, std::nothrow_t const&)
 111 { OPERATOR_NEW_BODY_ALIGN(FROM_NEW_BR, true /*nothrow*/); }
 112
 113 #else  // SANITIZER_MAC
 114 INTERCEPTOR(void *, _Znwm, size_t size) {
 115   OPERATOR_NEW_BODY(FROM_NEW, false /*nothrow*/);
 116 }
 117 INTERCEPTOR(void *, _Znam, size_t size) {
 118   OPERATOR_NEW_BODY(FROM_NEW_BR, false /*nothrow*/);
 119 }
 120 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
 121   OPERATOR_NEW_BODY(FROM_NEW, true /*nothrow*/);
 122 }
 123 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
 124   OPERATOR_NEW_BODY(FROM_NEW_BR, true /*nothrow*/);
 125 }
 126 #endif
 127
 128 #define OPERATOR_DELETE_BODY(type) \
 129   GET_STACK_TRACE_FREE;\
 130   asan_free(ptr, &stack, type);
 131
 132 #if !SANITIZER_MAC
 133 CXX_OPERATOR_ATTRIBUTE
 134 void operator delete(void *ptr) NOEXCEPT {
 135   OPERATOR_DELETE_BODY(FROM_NEW);
 136 }
 137 CXX_OPERATOR_ATTRIBUTE
 138 void operator delete[](void *ptr) NOEXCEPT {
 139   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 140 }
 141 CXX_OPERATOR_ATTRIBUTE
 142 void operator delete(void *ptr, std::nothrow_t const&) {
 143   OPERATOR_DELETE_BODY(FROM_NEW);
 144 }
 145 CXX_OPERATOR_ATTRIBUTE
 146 void operator delete[](void *ptr, std::nothrow_t const&) {
 147   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 148 }
 149 CXX_OPERATOR_ATTRIBUTE
 150 void operator delete(void *ptr, size_t size) NOEXCEPT {
 151   GET_STACK_TRACE_FREE;
 152   asan_sized_free(ptr, size, &stack, FROM_NEW);
 153 }
 154 CXX_OPERATOR_ATTRIBUTE
 155 void operator delete[](void *ptr, size_t size) NOEXCEPT {
 156   GET_STACK_TRACE_FREE;
 157   asan_sized_free(ptr, size, &stack, FROM_NEW_BR);
 158 }
 159 CXX_OPERATOR_ATTRIBUTE
 160 void operator delete(void *ptr, std::align_val_t) NOEXCEPT {
 161   OPERATOR_DELETE_BODY(FROM_NEW);
 162 }
 163 CXX_OPERATOR_ATTRIBUTE
 164 void operator delete[](void *ptr, std::align_val_t) NOEXCEPT {
 165   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 166 }
 167 CXX_OPERATOR_ATTRIBUTE
 168 void operator delete(void *ptr, std::align_val_t, std::nothrow_t const&) {
 169   OPERATOR_DELETE_BODY(FROM_NEW);
 170 }
 171 CXX_OPERATOR_ATTRIBUTE
 172 void operator delete[](void *ptr, std::align_val_t, std::nothrow_t const&) {
 173   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 174 }
 175 CXX_OPERATOR_ATTRIBUTE
 176 void operator delete(void *ptr, size_t size, std::align_val_t) NOEXCEPT {
 177   GET_STACK_TRACE_FREE;
 178   asan_sized_free(ptr, size, &stack, FROM_NEW);
 179 }
 180 CXX_OPERATOR_ATTRIBUTE
 181 void operator delete[](void *ptr, size_t size, std::align_val_t) NOEXCEPT {
 182   GET_STACK_TRACE_FREE;
 183   asan_sized_free(ptr, size, &stack, FROM_NEW_BR);
 184 }
 185
 186 #else  // SANITIZER_MAC
 187 INTERCEPTOR(void, _ZdlPv, void *ptr) {
 188   OPERATOR_DELETE_BODY(FROM_NEW);
 189 }
 190 INTERCEPTOR(void, _ZdaPv, void *ptr) {
 191   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 192 }
 193 INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
 194   OPERATOR_DELETE_BODY(FROM_NEW);
 195 }
 196 INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
 197   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 198 }
 199 #endif