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 "sanitizer_common/sanitizer_interception.h"
  18
  19 #include <stddef.h>
  20
  21 // C++ operators can't have visibility attributes on Windows.
  22 #if SANITIZER_WINDOWS
  23 # define CXX_OPERATOR_ATTRIBUTE
  24 #else
  25 # define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE
  26 #endif
  27
  28 using namespace __asan;  // NOLINT
  29
  30 // This code has issues on OSX.
  31 // See https://code.google.com/p/address-sanitizer/issues/detail?id=131.
  32
  33 // Fake std::nothrow_t to avoid including <new>.
  34 namespace std {
  35 struct nothrow_t {};
  36 }  // namespace std
  37
  38 #define OPERATOR_NEW_BODY(type) \
  39   GET_STACK_TRACE_MALLOC;\
  40   return asan_memalign(0, size, &stack, type);
  41
  42 // On OS X it's not enough to just provide our own 'operator new' and
  43 // 'operator delete' implementations, because they're going to be in the
  44 // runtime dylib, and the main executable will depend on both the runtime
  45 // dylib and libstdc++, each of those'll have its implementation of new and
  46 // delete.
  47 // To make sure that C++ allocation/deallocation operators are overridden on
  48 // OS X we need to intercept them using their mangled names.
  49 #if !SANITIZER_MAC
  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 CXX_OPERATOR_ATTRIBUTE
  60 void *operator new(size_t size) { OPERATOR_NEW_BODY(FROM_NEW); }
  61 CXX_OPERATOR_ATTRIBUTE
  62 void *operator new[](size_t size) { OPERATOR_NEW_BODY(FROM_NEW_BR); }
  63 CXX_OPERATOR_ATTRIBUTE
  64 void *operator new(size_t size, std::nothrow_t const&)
  65 { OPERATOR_NEW_BODY(FROM_NEW); }
  66 CXX_OPERATOR_ATTRIBUTE
  67 void *operator new[](size_t size, std::nothrow_t const&)
  68 { OPERATOR_NEW_BODY(FROM_NEW_BR); }
  69
  70 #else  // SANITIZER_MAC
  71 INTERCEPTOR(void *, _Znwm, size_t size) {
  72   OPERATOR_NEW_BODY(FROM_NEW);
  73 }
  74 INTERCEPTOR(void *, _Znam, size_t size) {
  75   OPERATOR_NEW_BODY(FROM_NEW_BR);
  76 }
  77 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
  78   OPERATOR_NEW_BODY(FROM_NEW);
  79 }
  80 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
  81   OPERATOR_NEW_BODY(FROM_NEW_BR);
  82 }
  83 #endif
  84
  85 #define OPERATOR_DELETE_BODY(type) \
  86   GET_STACK_TRACE_FREE;\
  87   asan_free(ptr, &stack, type);
  88
  89 #if !SANITIZER_MAC
  90 CXX_OPERATOR_ATTRIBUTE
  91 void operator delete(void *ptr) throw() {
  92   OPERATOR_DELETE_BODY(FROM_NEW);
  93 }
  94 CXX_OPERATOR_ATTRIBUTE
  95 void operator delete[](void *ptr) throw() {
  96   OPERATOR_DELETE_BODY(FROM_NEW_BR);
  97 }
  98 CXX_OPERATOR_ATTRIBUTE
  99 void operator delete(void *ptr, std::nothrow_t const&) {
 100   OPERATOR_DELETE_BODY(FROM_NEW);
 101 }
 102 CXX_OPERATOR_ATTRIBUTE
 103 void operator delete[](void *ptr, std::nothrow_t const&) {
 104   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 105 }
 106 CXX_OPERATOR_ATTRIBUTE
 107 void operator delete(void *ptr, size_t size) throw() {
 108   GET_STACK_TRACE_FREE;
 109   asan_sized_free(ptr, size, &stack, FROM_NEW);
 110 }
 111 CXX_OPERATOR_ATTRIBUTE
 112 void operator delete[](void *ptr, size_t size) throw() {
 113   GET_STACK_TRACE_FREE;
 114   asan_sized_free(ptr, size, &stack, FROM_NEW_BR);
 115 }
 116
 117 #else  // SANITIZER_MAC
 118 INTERCEPTOR(void, _ZdlPv, void *ptr) {
 119   OPERATOR_DELETE_BODY(FROM_NEW);
 120 }
 121 INTERCEPTOR(void, _ZdaPv, void *ptr) {
 122   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 123 }
 124 INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
 125   OPERATOR_DELETE_BODY(FROM_NEW);
 126 }
 127 INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
 128   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 129 }
 130 #endif