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 #include "OptionData.h"
40 
41 // Forward declarations.
42 class DebugData;
43 struct Header;
44 struct Config;
45 
46 class GuardData : public OptionData {
47  public:
48   GuardData(DebugData* debug_data, int init_value, size_t num_bytes);
49   virtual ~GuardData() = default;
50 
Valid(void * data)51   bool Valid(void* data) { return memcmp(data, cmp_mem_.data(), cmp_mem_.size()) == 0; }
52 
53   void LogFailure(const Header* header, const void* pointer, const void* data);
54 
55  protected:
56   std::vector<uint8_t> cmp_mem_;
57 
58   virtual const char* GetTypeName() = 0;
59 
60   DISALLOW_COPY_AND_ASSIGN(GuardData);
61 };
62 
63 class FrontGuardData : public GuardData {
64  public:
65   FrontGuardData(DebugData* debug_data, const Config& config, size_t* offset);
66   virtual ~FrontGuardData() = default;
67 
68   bool Valid(const Header* header);
69 
70   void LogFailure(const Header* header);
71 
offset()72   size_t offset() { return offset_; }
73 
74  private:
GetTypeName()75   const char* GetTypeName() override { return "FRONT"; }
76 
77   size_t offset_ = 0;
78 
79   DISALLOW_COPY_AND_ASSIGN(FrontGuardData);
80 };
81 
82 class RearGuardData : public GuardData {
83  public:
84   RearGuardData(DebugData* debug_data, const Config& config);
85   virtual ~RearGuardData() = default;
86 
87   bool Valid(const Header* header);
88 
89   void LogFailure(const Header* header);
90 
91  private:
GetTypeName()92   const char* GetTypeName() override { return "REAR"; }
93 
94   DISALLOW_COPY_AND_ASSIGN(RearGuardData);
95 };
96 
97 #endif // DEBUG_MALLOC_GUARDDATA_H
98