lib/asan/asan_new_delete.cc

   1 //===-- asan_interceptors.cc ----------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file is a part of AddressSanitizer, an address sanity checker.
  11 //
  12 // Interceptors for operators new and delete.
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "asan_allocator.h"
  16 #include "asan_internal.h"
  17 #include "asan_stack.h"
  18
  19 #include "sanitizer_common/sanitizer_interception.h"
  20
  21 #include <stddef.h>
  22
  23 // C++ operators can't have visibility attributes on Windows.
  24 #if SANITIZER_WINDOWS
  25 # define CXX_OPERATOR_ATTRIBUTE
  26 #else
  27 # define CXX_OPERATOR_ATTRIBUTE INTERCEPTOR_ATTRIBUTE
  28 #endif
  29
  30 using namespace __asan;  // NOLINT
  31
  32 // This code has issues on OSX.
  33 // See https://code.google.com/p/address-sanitizer/issues/detail?id=131.
  34
  35 // Fake std::nothrow_t to avoid including <new>.
  36 namespace std {
  37 struct nothrow_t {};
  38 }  // namespace std
  39
  40 #define OPERATOR_NEW_BODY(type) \
  41   GET_STACK_TRACE_MALLOC;\
  42   return asan_memalign(0, size, &stack, type);
  43
  44 // On OS X it's not enough to just provide our own 'operator new' and
  45 // 'operator delete' implementations, because they're going to be in the
  46 // runtime dylib, and the main executable will depend on both the runtime
  47 // dylib and libstdc++, each of those'll have its implementation of new and
  48 // delete.
  49 // To make sure that C++ allocation/deallocation operators are overridden on
  50 // OS X we need to intercept them using their mangled names.
  51 #if !SANITIZER_MAC
  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 CXX_OPERATOR_ATTRIBUTE
  62 void *operator new(size_t size) { OPERATOR_NEW_BODY(FROM_NEW); }
  63 CXX_OPERATOR_ATTRIBUTE
  64 void *operator new[](size_t size) { OPERATOR_NEW_BODY(FROM_NEW_BR); }
  65 CXX_OPERATOR_ATTRIBUTE
  66 void *operator new(size_t size, std::nothrow_t const&)
  67 { OPERATOR_NEW_BODY(FROM_NEW); }
  68 CXX_OPERATOR_ATTRIBUTE
  69 void *operator new[](size_t size, std::nothrow_t const&)
  70 { OPERATOR_NEW_BODY(FROM_NEW_BR); }
  71
  72 #else  // SANITIZER_MAC
  73 INTERCEPTOR(void *, _Znwm, size_t size) {
  74   OPERATOR_NEW_BODY(FROM_NEW);
  75 }
  76 INTERCEPTOR(void *, _Znam, size_t size) {
  77   OPERATOR_NEW_BODY(FROM_NEW_BR);
  78 }
  79 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
  80   OPERATOR_NEW_BODY(FROM_NEW);
  81 }
  82 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&) {
  83   OPERATOR_NEW_BODY(FROM_NEW_BR);
  84 }
  85 #endif
  86
  87 #define OPERATOR_DELETE_BODY(type) \
  88   GET_STACK_TRACE_FREE;\
  89   asan_free(ptr, &stack, type);
  90
  91 #if !SANITIZER_MAC
  92 CXX_OPERATOR_ATTRIBUTE
  93 void operator delete(void *ptr) throw() {
  94   OPERATOR_DELETE_BODY(FROM_NEW);
  95 }
  96 CXX_OPERATOR_ATTRIBUTE
  97 void operator delete[](void *ptr) throw() {
  98   OPERATOR_DELETE_BODY(FROM_NEW_BR);
  99 }
 100 CXX_OPERATOR_ATTRIBUTE
 101 void operator delete(void *ptr, std::nothrow_t const&) {
 102   OPERATOR_DELETE_BODY(FROM_NEW);
 103 }
 104 CXX_OPERATOR_ATTRIBUTE
 105 void operator delete[](void *ptr, std::nothrow_t const&) {
 106   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 107 }
 108
 109 #else  // SANITIZER_MAC
 110 INTERCEPTOR(void, _ZdlPv, void *ptr) {
 111   OPERATOR_DELETE_BODY(FROM_NEW);
 112 }
 113 INTERCEPTOR(void, _ZdaPv, void *ptr) {
 114   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 115 }
 116 INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
 117   OPERATOR_DELETE_BODY(FROM_NEW);
 118 }
 119 INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&) {
 120   OPERATOR_DELETE_BODY(FROM_NEW_BR);
 121 }
 122 #endif