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You're reading from Linux Kernel Programming

Product type Book

Published in Mar 2021

Publisher Packt

ISBN-13 9781789953435

Pages 754 pages

Edition 1st Edition

Languages

Concepts

System Administration

Author (1):

Kaiwan N. Billimoria

Table of Contents (19) Chapters

Preface

1. Section 1: The Basics

2. Kernel Workspace Setup

3. Building the 5.x Linux Kernel from Source - Part 1

4. Building the 5.x Linux Kernel from Source - Part 2

5. Writing Your First Kernel Module - LKMs Part 1

6. Writing Your First Kernel Module - LKMs Part 2

7. Section 2: Understanding and Working with the Kernel

8. Kernel Internals Essentials - Processes and Threads

9. Memory Management Internals - Essentials

10. Kernel Memory Allocation for Module Authors - Part 1

11. Kernel Memory Allocation for Module Authors - Part 2

12. The CPU Scheduler - Part 1

13. The CPU Scheduler - Part 2

14. Section 3: Delving Deeper

15. Kernel Synchronization - Part 1

16. Kernel Synchronization - Part 2

17. About Packt

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18. Other Books You May Enjoy

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Trying it out – triggering a UAF bug

To help you understand this better, we'll show an example via screenshots in this section. Implement the following steps:

Firstly, ensure you enable the CONFIG_SLUB_DEBUG kernel config (it should be set to y; this is typically the case on distro kernels)
Next, boot the system while including the kernel command-line slub_debug= directive (this turns on full SLUB debug; or you could pass a finer granularity variant such as slub_debug=FZPU (see the kernel documentation here for an explanation of each field: https://www.kernel.org/doc/Documentation/vm/slub.txt); as a demo, on my Fedora 31 guest VM, I passed the kernel command line as follows - the important thing here, the slub_debug=FZPU is highlighted in bold font:

$ cat /proc/cmdline
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-5.4.0-llkd01 root=/dev/mapper/fedora_localhost--live-root ro resume=/dev/mapper/fedora_localhost--live-swap rd.lvm.lv=fedora_localhost-live...

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Authors (1)

Kaiwan N. Billimoria

Kaiwan N. Billimoria taught himself BASIC programming on his dad's IBM PC back in 1983. He was programming in C and Assembly on DOS until he discovered the joys of Unix, and by around 1997, Linux! Kaiwan has worked on many aspects of the Linux system programming stack, including Bash scripting, system programming in C, kernel internals, device drivers, and embedded Linux work. He has actively worked on several commercial/FOSS projects. His contributions include drivers to the mainline Linux OS and many smaller projects hosted on GitHub. His Linux passion feeds well into his passion for teaching these topics to engineers, which he has done for well over two decades now. He's also the author of Hands-On System Programming with Linux, Linux Kernel Programming (and its Part 2 book) and Linux Kernel Debugging. It doesn't hurt that he is a recreational ultrarunner too.

See other products by Kaiwan N. Billimoria