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      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.
     40 class DebugData;
     41 struct Header;
     42 struct Config;
     43 
     44 class 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 
     61 class 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 
     80 class 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