Add check for executable stack/heap when rating Linux exploitability.

src/processor/exploitability_linux.h

 // 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
@@ skipping 33 matching lines @@
 namespace google_breakpad {
 
 class ExploitabilityLinux : public Exploitability {
  public:
   ExploitabilityLinux(Minidump *dump,
                       ProcessState *process_state);
 
   virtual ExploitabilityRating CheckPlatformExploitability();
 
  private:
-  // This method takes the address of the instruction pointer and returns
+  // 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);
 
-  // This method checks the exception that triggered the creation of the
+  // 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);
 
   // 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();
 };
 
 }  // namespace google_breakpad
 
 #endif  // GOOGLE_BREAKPAD_PROCESSOR_EXPLOITABILITY_LINUX_H_