1//===-- msan_new_delete.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 MemorySanitizer.
10//
11// Interceptors for operators new and delete.
12//===----------------------------------------------------------------------===//
13
14#include "msan.h"
15#include "interception/interception.h"
16#include "sanitizer_common/sanitizer_allocator.h"
17#include "sanitizer_common/sanitizer_allocator_report.h"
18
19#if MSAN_REPLACE_OPERATORS_NEW_AND_DELETE
20
21#include <stddef.h>
22
23using namespace __msan;
24
25// Fake std::nothrow_t and std::align_val_t to avoid including <new>.
26namespace std {
27  struct nothrow_t {};
28  enum class align_val_t: size_t {};
29}  // namespace std
30
31
32// TODO(alekseys): throw std::bad_alloc instead of dying on OOM.
33#define OPERATOR_NEW_BODY(nothrow) \
34  GET_MALLOC_STACK_TRACE; \
35  void *res = msan_malloc(size, &stack);\
36  if (!nothrow && UNLIKELY(!res)) ReportOutOfMemory(size, &stack);\
37  return res
38#define OPERATOR_NEW_BODY_ALIGN(nothrow) \
39  GET_MALLOC_STACK_TRACE;\
40  void *res = msan_memalign((uptr)align, size, &stack);\
41  if (!nothrow && UNLIKELY(!res)) ReportOutOfMemory(size, &stack);\
42  return res;
43
44INTERCEPTOR_ATTRIBUTE
45void *operator new(size_t size) { OPERATOR_NEW_BODY(false /*nothrow*/); }
46INTERCEPTOR_ATTRIBUTE
47void *operator new[](size_t size) { OPERATOR_NEW_BODY(false /*nothrow*/); }
48INTERCEPTOR_ATTRIBUTE
49void *operator new(size_t size, std::nothrow_t const&) {
50  OPERATOR_NEW_BODY(true /*nothrow*/);
51}
52INTERCEPTOR_ATTRIBUTE
53void *operator new[](size_t size, std::nothrow_t const&) {
54  OPERATOR_NEW_BODY(true /*nothrow*/);
55}
56INTERCEPTOR_ATTRIBUTE
57void *operator new(size_t size, std::align_val_t align)
58{ OPERATOR_NEW_BODY_ALIGN(false /*nothrow*/); }
59INTERCEPTOR_ATTRIBUTE
60void *operator new[](size_t size, std::align_val_t align)
61{ OPERATOR_NEW_BODY_ALIGN(false /*nothrow*/); }
62INTERCEPTOR_ATTRIBUTE
63void *operator new(size_t size, std::align_val_t align, std::nothrow_t const&)
64{ OPERATOR_NEW_BODY_ALIGN(true /*nothrow*/); }
65INTERCEPTOR_ATTRIBUTE
66void *operator new[](size_t size, std::align_val_t align, std::nothrow_t const&)
67{ OPERATOR_NEW_BODY_ALIGN(true /*nothrow*/); }
68
69#define OPERATOR_DELETE_BODY \
70  GET_MALLOC_STACK_TRACE; \
71  if (ptr) MsanDeallocate(&stack, ptr)
72
73INTERCEPTOR_ATTRIBUTE
74void operator delete(void *ptr) NOEXCEPT { OPERATOR_DELETE_BODY; }
75INTERCEPTOR_ATTRIBUTE
76void operator delete[](void *ptr) NOEXCEPT { OPERATOR_DELETE_BODY; }
77INTERCEPTOR_ATTRIBUTE
78void operator delete(void *ptr, std::nothrow_t const&) { OPERATOR_DELETE_BODY; }
79INTERCEPTOR_ATTRIBUTE
80void operator delete[](void *ptr, std::nothrow_t const&) {
81  OPERATOR_DELETE_BODY;
82}
83INTERCEPTOR_ATTRIBUTE
84void operator delete(void *ptr, size_t size) NOEXCEPT { OPERATOR_DELETE_BODY; }
85INTERCEPTOR_ATTRIBUTE
86void operator delete[](void *ptr, size_t size) NOEXCEPT
87{ OPERATOR_DELETE_BODY; }
88INTERCEPTOR_ATTRIBUTE
89void operator delete(void *ptr, std::align_val_t align) NOEXCEPT
90{ OPERATOR_DELETE_BODY; }
91INTERCEPTOR_ATTRIBUTE
92void operator delete[](void *ptr, std::align_val_t align) NOEXCEPT
93{ OPERATOR_DELETE_BODY; }
94INTERCEPTOR_ATTRIBUTE
95void operator delete(void *ptr, std::align_val_t align, std::nothrow_t const&)
96{ OPERATOR_DELETE_BODY; }
97INTERCEPTOR_ATTRIBUTE
98void operator delete[](void *ptr, std::align_val_t align, std::nothrow_t const&)
99{ OPERATOR_DELETE_BODY; }
100INTERCEPTOR_ATTRIBUTE
101void operator delete(void *ptr, size_t size, std::align_val_t align) NOEXCEPT
102{ OPERATOR_DELETE_BODY; }
103INTERCEPTOR_ATTRIBUTE
104void operator delete[](void *ptr, size_t size, std::align_val_t align) NOEXCEPT
105{ OPERATOR_DELETE_BODY; }
106
107
108#endif // MSAN_REPLACE_OPERATORS_NEW_AND_DELETE
109