'Instruction pointer' diaporamas de présentation

CS 201 Stack smashing

CS 201 Stack smashing. Stack smashing (buffer overflow). One of the most prevalent remote security exploits 2002: 22.5% of security fixes provided by vendors were for buffer overflows 2004: All available exploits: 75% were buffer overflows

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Chapter 4 Processor Technology and Architecture

Chapter 4 Processor Technology and Architecture. Chapter Goals. Describe CPU instruction and execution cycles. Explain how primitive CPU instructions are combined to form complex processing operations.

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Control Flow Hijack Defenses Canaries, DEP, and ASLR

Control Flow Hijack Defenses Canaries, DEP, and ASLR. David Brumley Carnegie Mellon University. Control Flow Hijack: Always control + computation. computation + control. code injection return-to- libc Heap metadata overwrite return-oriented programming .

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Shellgames

Shellgames. Peter Ferrie Senior Anti-virus Researcher 4 February, 2009. 1. Outside the Shell. Gaining control Buffer overflow Double-free Function-pointer hijack NULL-pointer access (rare) And others. 2. Peter Ferrie, Microsoft Corporation. Outside the Shell. Types of shellcode

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CMSC 330: Organization of Programming Languages

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Computer architecture

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Computers organization & Assembly Language

Computers organization & Assembly Language. Chapter 1 THE 80x86 MICROPROCESSOR. Registers inside 8088/8086 , IA-32 Instruction Execution Cycle IA-32 Memory Management. Inside the 8088/8086. Registers inside 8088/8086. Registers are used to store information temporarily.

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Foundational Certified Code in a Metalogical Framework

Foundational Certified Code in a Metalogical Framework. Karl Crary and Susmit Sarkar Carnegie Mellon University. Motivation: Grid Computing. Make use of idle computing cycles over the network [e.g. SETI] Computer owners download and execute code from developers

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Code Generation I

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Computer architecture, part 1:

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Chapter 5 - Strings, Procedures and Macros from Microprocessors and Interfacing by Douglas Hall

Chapter 5 - Strings, Procedures and Macros from Microprocessors and Interfacing by Douglas Hall. Objective. At the conclusion of this chapter you will be able to: Use 8086 string manipulation instructions to perform a variety of operations on a sequence of data words in the memory.

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MICRO PROCESSER

MICRO PROCESSER. The micro processer is a multipurpose programmable, clock driven, register based, electronic integrated device that has computing and decision making capability .

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State of the Exploit

State of the Exploit. Matt Miller / mmiller@leviathansecurity.com. What is the state of the exploit?. Where do generic exploitation techniques stand in 2008? Formidable mitigations exist (ASLR, NX, GS) Many techniques impractical or impossible

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Functions

Functions. Objectives. Take a first look at building functions Study how a function is called Investigate how a function executes Take a first look at class methods. Problem. Fahrenheit to Celsius Conversion

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Nested Procedure calls and Flowcharts

Nested Procedure calls and Flowcharts. A nested procedure call occurs when a called procedure calls another before the first procedure returns. Suppose that main calls a procedure named Sub1.While sub 1 is executing it calls the Sub2 procedure.

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Microprocessor and Microcontrollers sessional (CSE-3512) Lab-2

Microprocessor and Microcontrollers sessional (CSE-3512) Lab-2. Instructor: Sazid Zaman Khan Lecturer, Department of Computer Science and Engineering, IIUC. Inside the 8086 CPU. Inside the 8086 CPU.

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Task Switching

Task Switching. The multitasking/multiuser OS needs the ability to rapidly switch between tasks. Intel 386DX supports this operation by providing a task switch instruction hardware . The task switch operation

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A Stack Frame

CAP6135: Malware and Software Vulnerability Analysis Buffer Overflow : Example of Using GDB to Check Stack Memory Cliff Zou Spring 2011. A Stack Frame. Parameters Return Address Calling Stack Pointer Local Variables. BP. SP+ offset. SP. Addresses. 00000000.

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