'Stack frame' diaporamas de présentation

Lecture 17 Modern Programming Trends JVM, C#, .NET

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Buffer Overflows

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Control

Control. Outline. PC-relative Address Suggested reading Chap 3.6.3. Example. jle .L2 .L5: movl % edx , % eax sarl $1, % eax subl % eax , % edx Leal (% edx , % edx , 2), % edx testl % edx , % edx jg .L5 9 .L2: 10 movl % edx , % eax.

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Calling Conventions

Calling Conventions. Hakim Weatherspoon CS 3410, Spring 2012 Computer Science Cornell University. See P&H 2.8 and 2.12 . Goals for Today. Calling Convention for Procedure Calls Enable code to be reused by allowing code snippets to be invoked Will need a way to

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Calling Conventions

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Today

Today. C operators and their precedence Memory layout Buffer overflow, worms, and viruses. Operator Preference in C (16 levels). Operators Associativity () [] -> . (postfix versions of ++ -- ) left to right 16 (prefix versions of ++ -- ) sizeof right to left 15

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Stack Frames and Functions

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AJAX Toolkit Framework

AJAX Toolkit Framework. Robert Goodman ( goodmanr@us.ibm.com ) Leugim (Gino) Bustelo ( lbustelo@us.ibm.com ) IBM Software Group. Agenda. Overview AJAX Toolkit Framework Components Component Details Where to get AJAX Toolkit Framework Demonstrations through-out ATF Based Products .

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Chapter 5.6-5.9

Program Optimization: Measurement/Loops/Parallelism CSCi 2021: Computer Architecture and Organization. Chapter 5.6-5.9. Today. Measure performance Loops Exploiting Instruction-Level Parallelism Exam Assignment 4 out later today performance optimization. Last Time. Program optimization

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Lecture 9: Use and Abuse of the Stack (cont'd)

Lecture 9: Use and Abuse of the Stack (cont'd). CS 105 September 26, 2019. Review: Stack Frames. 0x7FFFFFFF. Stack. Each function called gets a stack frame Passing data: calling procedure P uses registers (and stack) to provide parameters to Q.

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Recitation 4

Outline Buffer overflow Practical skills for Lab 3 Code optimization Strength reduction Common sub-expression Loop unrolling Reminders Lab 3: due Thursday Exam1: next Tuesday. Minglong Shao E-mail: shaoml+213@cs.cmu.edu Office hours: Thursdays 5-6PM Wean Hall 1315. Recitation 4.

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Data Structures and Algorithms

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Dataflow Analysis in Dyninst

Dataflow Analysis in Dyninst. Xiaozhu Meng. Four Analyses in Dyninst. Liveness Analysis Determine which registers are live for each instruction Stack Analysis Calculate the height of a stack frame for each instruction Program Slicing

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Buffer-overflow Lab

Buffer-overflow Lab. Zutao Zhu 09/18/2009. Outline. GDB and SetUID GDB tutorial Stack frame Lab. GDB and SetUID.

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Recursion

Recursion. CSCE 121 J. Michael Moore. Self-Similarity. Romanesco broccoli. Self-Similarity. Fractals. Repeated self-similarity can be infinite. Koch Snowflake. Landscapes. Add randomness to repeated pattern landscapes. Fractal Landscape.

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Procedures

Procedures are very important for writing reusable and maintainable code in assembly and high-level languages. How are they implemented? Application Binary Interfaces Calling Conventions Recursive Calls Examples Reference: PowerPC Embedded ABI. Procedures. General Concepts.

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Smashing the Stack for Fun and Profit

Smashing the Stack for Fun and Profit. -by aleph1 circa 1996 Presented by Dan Frohlich. Overview. Memory and Stack basics. The buffer overflow vulnerability. Take control. Spawn a shell. Issues. Guesswork and Increasing your chance of success. Questions?. Memory Basics.

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64-Bit Architectures

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