How Can a Function Jump to an Uncalled Routine? Exploring Stack Tricks and Process Switching

The article explains how operating‑system multitasking and process switching share the same underlying mechanism as function calls, demonstrates a C program that overwrites a return address to jump to an unexpected function, and shows the resulting assembly to illustrate the similarity between buffer‑overflow attacks and legitimate context switches.

AssemblyC programmingbuffer overflow

0 likes · 7 min read

How Can a Function Jump to an Uncalled Routine? Exploring Stack Tricks and Process Switching

IT Services Circle

Dec 16, 2024 · Fundamentals

Understanding Process Switching Through Function Calls and Buffer‑Overflow Exploits

The article explains the essence of process switching by comparing it to function calls, demonstrates how manipulating a function's return address can redirect execution to another function, and shows the underlying assembly and security implications of such control‑flow changes.

AssemblyControl FlowOperating System

0 likes · 7 min read

Understanding Process Switching Through Function Calls and Buffer‑Overflow Exploits

Thoughts on Knowledge and Action

Dec 4, 2022 · Fundamentals

Understanding User vs Kernel Space, Process Switching, and Linux I/O Models

This article explains the distinction between user and kernel space, outlines the steps involved in a process switch, and compares several Linux I/O models—including blocking, non‑blocking, multiplexing, and asynchronous approaches—highlighting their advantages and drawbacks.

I/O ModelsKernelLinux

0 likes · 9 min read

Understanding User vs Kernel Space, Process Switching, and Linux I/O Models

IT Architects Alliance

Nov 28, 2021 · Fundamentals

Understanding Synchronization, Blocking, and I/O Models in Linux

This article explains the concepts of synchronous vs. asynchronous execution, blocking vs. non‑blocking operations, user and kernel space, process switching, file descriptors, cache I/O, and compares various Linux I/O models such as select, poll, epoll, signal‑driven and asynchronous I/O.

BlockingIO modelsLinux

0 likes · 15 min read

Understanding Synchronization, Blocking, and I/O Models in Linux

Architects' Tech Alliance

Nov 26, 2021 · Fundamentals

Understanding Synchrony, Blocking, Process Switching, File Descriptors, and I/O Models (select, poll, epoll)

This article explains the differences between synchronous and asynchronous execution, blocking and non‑blocking operations, user and kernel space, process switching, file descriptors, cache I/O, and compares various I/O models—including blocking, non‑blocking, multiplexing, signal‑driven, and asynchronous—while highlighting the characteristics of select, poll, and epoll.

BlockingIO modelsNon-blocking

0 likes · 15 min read

Understanding Synchrony, Blocking, Process Switching, File Descriptors, and I/O Models (select, poll, epoll)