PPT-Diagnosing Unbounded Heap Growth in C++

Problem Description Types of Unbounded Heap Growth Reference Lost Leak Reference lost to memory without freeing it Well studied wide variety of tools that identify leaks Reference Retained But no longer . Brie64258y given a heap over64258ow JavaScript commands can be used to insure that a function pointer is reliably present for smashing just after the over64258own buffer A case study serves to high light the technique the Safari exploit that the aut Transform and Conquer. Instructor: . Tanvir. What is Transform and Conquer ?. The 4. th. algorithm design technique we are going to study. Three major variations. Instance Simplification:. Transform to a simpler or more convenient instance of the same problem. Dr. Andrew Wallace PhD . BEng. (hons) . EurIng. andrew.wallace@cs.umu.se. Overview. Priority Queue. Priority Queue Examples. Heap. Heap Implementation. Building a Heap. Heap Operations. Variations of Heap . GrowthTracker. 1. Heap Growth Detection in C++. Motivation. Scalable City needs to run continuously. Many months without intervention/access. Had slow growth of memory. Caused crash after several weeks. Maria Jump. Kathryn S. McKinley. {mjump,mckinley}@cs.utexas.edu. Memory. Bugs. What memory bugs do explicitly managed languages have?. Does managed memory solve all our memory problems? . Memory . Leaks in Managed Languages. Lecture . 6. More on . arrays / Strings. Review. Scope. Exceptions. Arrays. Dynamic arrays. How?. Typed and anonymous. Issue. Named type required for passing to functions / procedures. procedure demo is . Partially adopted from C Plus Data Structure textbook slides. What is a Heap?. Shape. : . complete. binary tree. Order. : . for . each node in the heap, the value stored in that node is . greater than or equal to . CSCI 3110 Nan Chen. Priority Queue. Data structure that stores items and restricts accesses to the highest priority item. STL (Max heap) example. DeleteMax. 3, 88 2 , 6 ,7 . ?. Applications of priority queue. Sam Silvestro, . Hongyu. Liu, Corey Crosser,. Zhiqiang. Lin*, . Tongping Liu. University of Texas at San . Antonio. * University of Texas at Dallas. Common Heap Vulnerabilities. Buffer over-read. Information leakage. exclaimed, “How awful of you! 1 have grabbed hold of me like this, you would have grasped It right from the start.” ’s question, “Coming back to the topic, do you Space?” fects There are the universe and there are the effects of the whole universe there is our mastering the causes and effects of this whole universe causes and effects of this whole universe One146s natu Outline. This topic covers the simplest . Q. (. n. ln(. n. )). sorting algorithm: . heap sort. We will:. define the strategy. analyze the run time. convert an unsorted list into a heap. cover some examples. Heap is a collection of variable-size memory chunks allocated by the program. e.g., . malloc. (), free() in C,. creating a new object in Java. . creating a new object in Java script. Code Injection Attacks. Paruj Ratanaworabhan, Cornell University . Ben Livshits and Ben Zorn, Microsoft Research. (Redmond, WA). Heap Spraying is a Problem. Firefox 3.5. July 14, 2009. http://www.web2secure.com/2009/07/mozilla-firefox-35-heap-spray.html.