Fixing a flaky Linux exploitability unittest.

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 68 matching lines @@
 #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
@@ skipping 14 matching lines @@
   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_