About The Training

A 3-day Linux kernel exploitation frenzy!

This training guides researchers through the field of Linux kernel exploitation. In a series of practical labs, the training explores the process of exploiting kernel bugs in a modern Linux distribution on the x86-64 architecture.

The core requirement for this training is the ability to read and write C code. Basic knowledge of the x86-64 architecture and assembly, GDB, and the common binary exploitation techniques would also come in handy. There is no need to know any Linux kernel internals: all required parts are covered during the training.

Intermediate

Day 1 — Internals and exploitation basics:

• Internals and debugging: x86-64 architecture refresher;security-relevant Linux kernel internals and attack surface;types of kernel vulnerabilities;setting up kernel debugging environment with VMWare;using GDB to debug kernel and its modules.
• Escalating privileges: ret2usr, overwriting cred structure, overwriting modprobe_path;arbitrary address execution and arbitrary address read/write primitives.
   

Day 2 — Mitigation bypasses and slab exploitation basics:
 

• Bypassing mitigations: KASLR, SMEP, SMAP, and KPTI internals and bypass techniques;in-kernel Return-Oriented Programming (ROP);information leaks.
• Exploiting slab corruptions: in-depth SLUB internals;exploiting slab out-of-bounds and use-after-free vulnerabilities;slab-specific mitigations;data-only exploitation.
   

Day 3 — Modern slab exploitation:
 

• Cache merging and accounting;hardened usercopy;elastic objects;msg_msg-based exploitation techniques.
• Learning more advanced exploitation techniques;useful references.
• Extra self-study content:
  • Userfaultfd and FUSE;cross-cache attacks.

Hardware requirements:

- x86-64–based machine.
- At least 100 GB of free disk space.
- At least 16 GB of RAM.
- Ability to plug in an untrusted USB drive (relevant for corporate laptops).

Software requirements:

- Host OS: Linux (recommended) or Windows.
- VMWare Workstation Player or Pro.
- 7-Zip.

• Working C knowledge.
• Familiarity with x86-64 architecture and x86-64 assembly.
• Familiarity with GDB (GNU Debugger).
• Familiarity with common types of vulnerabilities and exploitation techniques for userspace applications.

No knowledge about Linux kernel internals is required.

The training is aimed at security researchers and software engineers desiring to enter or progress in the field of Linux kernel security.

The training is structured as a series of lectures, each followed by one or more hands-on labs. The goal of each lab is to write a Linux kernel exploit following the techniques described during the lecture.

The training starts with beginner topics but proceeds into advanced areas as well. The beginner chapters include learning how to escalate privileges and bypass foundational mitigations in x86-64 kernels. The advanced chapters are primarily dedicated to the modern slab (heap) exploitation techniques and include an in-depth analysis of the kernel allocators' internals.

• Presentation slides.
• Detailed lab guides with step-by-step instructions.
• Virtual machine images with tools, exercise binaries, and source code.

This training does not cover the topic of finding Linux kernel vulnerabilities, it's purely focused on the exploitation techniques.