W12

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Week 12 Objectives

This Week

Read before Next Week

Pointers

Recall Pointer Basics in C

Recall Casting in C

Function Pointers

Example

Buffer Overflow & Stack Smashing

Bounds Checking

Buffer Overflow

Stack Smashing

Flow of Execution

Exceptional Control Flow

Some Uses of Exceptions

Exceptional Events

General Exceptional Control Flow

Kinds of Exceptions

1. Interrupt

2. Trap

3. Fault

4. Abort

Transferring Control via Exception Table

Transferring Control to an Exception Handler

Exception Table

Exceptions/System Calls in IA-32 & Linux

Exception Numbers and Types

System Calls and Service Numbers

Making System Calls

System Call Example

Assembly Code

Processes & Context

Concurrency

User/Kernel Modes

Context Switch

Context Switch Example

Stepping through a read() System Call