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+// Copyright (c) 2013 Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// exploitability_linux.h: Linux specific exploitability engine.
+//
+// Provides a guess at the exploitability of the crash for the Linux
+// platform given a minidump and process_state.
+//
+// Author: Matthew Riley
+
+#ifndef GOOGLE_BREAKPAD_PROCESSOR_EXPLOITABILITY_LINUX_H_
+#define GOOGLE_BREAKPAD_PROCESSOR_EXPLOITABILITY_LINUX_H_
+
+#include "google_breakpad/common/breakpad_types.h"
+#include "google_breakpad/processor/exploitability.h"
+
+namespace google_breakpad {
+
+class ExploitabilityLinux : public Exploitability {
+ public:
+  ExploitabilityLinux(Minidump *dump,
+                      ProcessState *process_state);
+
+  // Parameters are the minidump to analyze, the object representing process
+  // state, and whether to enable objdump disassembly.
+  // Enabling objdump will allow exploitability analysis to call out to
+  // objdump for diassembly. It is used to check the identity of the
+  // instruction that caused the program to crash. If there are any
+  // portability concerns, this should not be enabled.
+  ExploitabilityLinux(Minidump *dump,
+                      ProcessState *process_state,
+                      bool enable_objdump);
+
+  virtual ExploitabilityRating CheckPlatformExploitability();
+
+ private:
+  friend class ExploitabilityLinuxTest;
+
+  // Takes the address of the instruction pointer and returns
+  // whether the instruction pointer lies in a valid instruction region.
+  bool InstructionPointerInCode(uint64_t instruction_ptr);
+
+  // Checks the exception that triggered the creation of the
+  // minidump and reports whether the exception suggests no exploitability.
+  bool BenignCrashTrigger(const MDRawExceptionStream *raw_exception_stream);
+
+  // This method checks if the crash occurred during a write to read-only or
+  // invalid memory. It does so by checking if the instruction at the
+  // instruction pointer is a write instruction, and if the target of the
+  // instruction is at a spot in memory that prohibits writes.
+  bool EndedOnIllegalWrite(uint64_t instruction_ptr);
+
+#ifndef _WIN32
+  // Disassembles raw bytes via objdump and pipes the output into the provided
+  // buffer, given the desired architecture, the file from which objdump will
+  // read, and the buffer length. The method returns whether the disassembly
+  // was a success, and the caller owns all pointers.
+  static bool DisassembleBytes(const string &architecture,
+                               const uint8_t *raw_bytes,
+                               const unsigned int MAX_OBJDUMP_BUFFER_LEN,
+                               char *objdump_output_buffer);
+
+  // Parses the objdump output given in |objdump_output_buffer| and extracts
+  // the line of the first instruction into |instruction_line|.  Returns true
+  // when the instruction line is successfully extracted.
+  static bool GetObjdumpInstructionLine(
+      const char *objdump_output_buffer,
+      string *instruction_line);
+
+  // Tokenizes out the operation and operands from a line of instruction
+  // disassembled by objdump. This method modifies the pointers to match the
+  // tokens of the instruction, and returns if the tokenizing was a success.
+  // The caller owns all pointers.
+  static bool TokenizeObjdumpInstruction(const string &line,
+                                         string *operation,
+                                         string *dest,
+                                         string *src);
+
+  // Calculates the effective address of an expression in the form reg+a or
+  // reg-a, where 'reg' is a register and 'a' is a constant, and writes the
+  // result in the pointer. The method returns whether the calculation was
+  // a success. The caller owns the pointer.
+  static bool CalculateAddress(const string &address_expression,
+                               const DumpContext &context,
+                               uint64_t *write_address);
+#endif  // _WIN32
+
+  // Checks if the stack pointer points to a memory mapping that is not
+  // labelled as the stack.
+  bool StackPointerOffStack(uint64_t stack_ptr);
+
+  // Checks if the stack or heap are marked executable according
+  // to the memory mappings.
+  bool ExecutableStackOrHeap();
+
+  // Whether this exploitability engine is permitted to shell out to objdump
+  // to disassemble raw bytes.
+  bool enable_objdump_;
+};
+
+}  // namespace google_breakpad
+
+#endif  // GOOGLE_BREAKPAD_PROCESSOR_EXPLOITABILITY_LINUX_H_