Linux Kernel Debugging
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Linux Kernel Debugging
Author: Kaiwan N. Billimoria
language: en
Publisher: Packt Publishing Ltd
Release Date: 2022-08-05
Effectively debug kernel modules, device drivers, and the kernel itself by gaining a solid understanding of powerful open source tools and advanced kernel debugging techniques Key Features Fully understand how to use a variety of kernel and module debugging tools and techniques using examples Learn to expertly interpret a kernel Oops and identify underlying defect(s) Use easy-to-look up tables and clear explanations of kernel-level defects to make this complex topic easy Book DescriptionThe Linux kernel is at the very core of arguably the world’s best production-quality OS. Debugging it, though, can be a complex endeavor. Linux Kernel Debugging is a comprehensive guide to learning all about advanced kernel debugging. This book covers many areas in-depth, such as instrumentation-based debugging techniques (printk and the dynamic debug framework), and shows you how to use Kprobes. Memory-related bugs tend to be a nightmare – two chapters are packed with tools and techniques devoted to debugging them. When the kernel gifts you an Oops, how exactly do you interpret it to be able to debug the underlying issue? We’ve got you covered. Concurrency tends to be an inherently complex topic, so a chapter on lock debugging will help you to learn precisely what data races are, including using KCSAN to detect them. Some thorny issues, both debug- and performance-wise, require detailed kernel-level tracing; you’ll learn to wield the impressive power of Ftrace and its frontends. You’ll also discover how to handle kernel lockups, hangs, and the dreaded kernel panic, as well as leverage the venerable GDB tool within the kernel (KGDB), along with much more. By the end of this book, you will have at your disposal a wide range of powerful kernel debugging tools and techniques, along with a keen sense of when to use which.What you will learn Explore instrumentation-based printk along with the powerful dynamic debug framework Use static and dynamic Kprobes to trap into kernel/module functions Catch kernel memory defects with KASAN, UBSAN, SLUB debug, and kmemleak Interpret an Oops in depth and precisely identify it s source location Understand data races and use KCSAN to catch evasive concurrency defects Leverage Ftrace and trace-cmd to trace the kernel flow in great detail Write a custom kernel panic handler and detect kernel lockups and hangs Use KGDB to single-step and debug kernel/module source code Who this book is for This book is for Linux kernel developers, module/driver authors, and testers interested in debugging and enhancing their Linux systems at the level of the kernel. System administrators who want to understand and debug the internal infrastructure of their Linux kernels will also find this book useful. A good grasp on C programming and the Linux command line is necessary. Some experience with kernel (module) development will help you follow along.
Linux Kernel Programming
DESCRIPTION Linus Torvald released the first version of a kernel in 1991, inspired at the time by both proprietary Unix and the Minix system. Thirty-four years later, this system has evolved with stability and robustness, making it almost indispensable for the DevSecOps community. The Linux kernel forms the robust core of countless systems, from embedded devices to vast data centers, driving unparalleled power and flexibility. This book is your essential guide to deeply understanding this fundamental component and mastering the art of developing high-performance kernel-level code This book meticulously details the kernel's history, architectural evolution, and custom build processes. You will master device driver fundamentals, distinguishing user from kernel space, and understanding the Linux Device Model (LDM). It explores Linux Security Modules, intricate kernel memory management, and various vital communication interfaces like I2C, SPI, SERIAL, PCI, and RTC. The guide concludes with task/process management, real-time concepts, and essential kernel debugging and profiling. By the end of this book, you will be well-equipped to confidently develop, optimize, and debug kernel-level code. This empowers you to build custom Linux systems, craft efficient device drivers, and troubleshoot complex issues, ready to tackle advanced Linux system programming challenges. You will also be able to better understand this system and develop your own drivers or low-level developments for it. WHAT YOU WILL LEARN ● GNU/Linux kernel history, feature evolution, and licensing. ● Understand and develop your character and block drivers. ● Develop new file systems. ● Manage your systems by communicating with the USB protocol. ● Debug your drivers, your kernel, or any other module in the kernel space. ● Understand the layout of the Linux device model. ● Memory management in the kernel, as well as via DMA or NUMA. ● Implement Linux Security Modules (LSM) and Netfilter stack hooks. WHO THIS BOOK IS FOR This book is for software engineers looking to understand the Linux kernel’s architecture, modify it, and develop custom modules. It also supports project managers, team leaders, and technical managers seeking a clear view of kernel development and capabilities. CISOs and IT managers will benefit from insights into kernel limitations, vulnerabilities, and security measures, such as Linux Security Modules (LSMs). TABLE OF CONTENTS 1. History of the GNU/Linux Kernel 2. Introduction to the Linux Kernel 3. Introduction to Device Drivers 4. Linux Device Model 5. Character Device Drivers 6. Block Drivers and Virtual Filesystem 7. USB Drivers and libusb 8. Network Drivers 9. Linux Security Modules 10. Kernel Memory and DMA 11. Navigating Linux Communication Interfaces 12. Process Management 13. Debugging GNU/Linux Kernel and Drivers
Software Engineering for Embedded Systems
This Expert Guide gives you the techniques and technologies in software engineering to optimally design and implement your embedded system. Written by experts with a solutions focus, this encyclopedic reference gives you an indispensable aid to tackling the day-to-day problems when using software engineering methods to develop your embedded systems. With this book you will learn: - The principles of good architecture for an embedded system - Design practices to help make your embedded project successful - Details on principles that are often a part of embedded systems, including digital signal processing, safety-critical principles, and development processes - Techniques for setting up a performance engineering strategy for your embedded system software - How to develop user interfaces for embedded systems - Strategies for testing and deploying your embedded system, and ensuring quality development processes - Practical techniques for optimizing embedded software for performance, memory, and power - Advanced guidelines for developing multicore software for embedded systems - How to develop embedded software for networking, storage, and automotive segments - How to manage the embedded development process Includes contributions from: Frank Schirrmeister, Shelly Gretlein, Bruce Douglass, Erich Styger, Gary Stringham, Jean Labrosse, Jim Trudeau, Mike Brogioli, Mark Pitchford, Catalin Dan Udma, Markus Levy, Pete Wilson, Whit Waldo, Inga Harris, Xinxin Yang, Srinivasa Addepalli, Andrew McKay, Mark Kraeling and Robert Oshana. - Road map of key problems/issues and references to their solution in the text - Review of core methods in the context of how to apply them - Examples demonstrating timeless implementation details - Short and to- the- point case studies show how key ideas can be implemented, the rationale for choices made, and design guidelines and trade-offs