1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef DEBUG_MALLOC_GUARDDATA_H
30#define DEBUG_MALLOC_GUARDDATA_H
31
32#include <stdint.h>
33#include <string.h>
34
35#include <vector>
36
37#include <private/bionic_macros.h>
38
39// Forward declarations.
40class DebugData;
41struct Header;
42struct Config;
43
44class GuardData {
45 public:
46  GuardData(int init_value, size_t num_bytes);
47  virtual ~GuardData() = default;
48
49  bool Valid(void* data) { return memcmp(data, cmp_mem_.data(), cmp_mem_.size()) == 0; }
50
51  void LogFailure(const Header* header, const void* pointer, const void* data);
52
53 protected:
54  std::vector<uint8_t> cmp_mem_;
55
56  virtual const char* GetTypeName() = 0;
57
58  DISALLOW_COPY_AND_ASSIGN(GuardData);
59};
60
61class FrontGuardData : public GuardData {
62 public:
63  FrontGuardData(const Config& config, size_t* offset);
64  virtual ~FrontGuardData() = default;
65
66  bool Valid(DebugData& debug, const Header* header);
67
68  void LogFailure(DebugData& debug, const Header* header);
69
70  size_t offset() { return offset_; }
71
72 private:
73  const char* GetTypeName() override { return "FRONT"; }
74
75  size_t offset_ = 0;
76
77  DISALLOW_COPY_AND_ASSIGN(FrontGuardData);
78};
79
80class RearGuardData : public GuardData {
81 public:
82  RearGuardData(const Config& config);
83  virtual ~RearGuardData() = default;
84
85  bool Valid(DebugData& debug, const Header* header);
86
87  void LogFailure(DebugData& debug, const Header* header);
88
89 private:
90  const char* GetTypeName() override { return "REAR"; }
91
92  DISALLOW_COPY_AND_ASSIGN(RearGuardData);
93};
94
95#endif // DEBUG_MALLOC_GUARDDATA_H
96