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Application Sandboxing

Principles, Technologies, and Secure Isolation

This book is 100% completeLast updated on 2026-07-13
Steve Publications

Application sandboxing is the foundation of secure modern computing. This book explores the principles, architectures, and technologies behind containers, virtual machines, browser sandboxes, WebAssembly, and more, explaining how they isolate untrusted code, where their security boundaries break down, and how to choose the right approach for real-world systems.

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About the Book

This book is a comprehensive technical guide to application sandboxing in modern computing. It covers the theory, architecture, implementation, and security models behind every major isolation technology, from Linux namespaces and cgroups through containers, virtual machines, microVMs, WebAssembly, browser sandboxes, and confidential computing. You will learn how each approach works under the hood, what trade-offs it makes in security versus performance versus portability, how attackers bypass these boundaries, and how to select, implement, and harden sandboxing solutions for desktop, server, cloud-native, and embedded environments. Whether you are a systems engineer designing the next generation of secure infrastructure, a security professional hunting for escape vectors, or an application developer who needs to ship code that runs safely in shared environments, this book will give you the technical depth and practical guidance to make informed decisions about isolation.

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About the Author

Steve Publications

Steve is a technology professional with more than 20 years of experience in software development, server infrastructure, cybersecurity, vulnerability research and reverse engineering. Throughout his career, he has designed, secured, analyzed and tested complex software and infrastructure, with a particular focus on understanding how systems fail and how they can be made more secure.

Outside of work, Steve enjoys sharing knowledge with the technology community. He collaborates with researchers, industry experts and technology professionals to write practical books covering software development, cybersecurity, cloud computing, networking, DevOps, artificial intelligence and enterprise technologies. His books focus on practical learning through clear explanations, real-world examples and hands-on exercises. With more than two decades of industry experience, his goal is to help IT professionals, students and technology enthusiasts build useful skills and stay current in a rapidly changing industry.

We believe readers deserve to know how our books are created. Most of our authors are not native English speakers, so we use AI to help translate, proofread manuscripts, fix grammar, improve sentence structure and make technical explanations easier to read. AI is used as an editing tool only. It does not replace the research, technical knowledge or hands-on experience behind our books. Some of our authors also prefer to remain anonymous for privacy or professional reasons. In those cases, we publish their work under a different name. The author's name may be different, but the quality of the content and our review process remain the same.

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Contents

Table of Contents

Principles, Technologies, and Secure Isolation

Introduction: When Isolation Fails

  1. The Promise of Sandboxing
  2. What This Book Covers
  3. What This Book Does Not Cover
  4. How to Read This Book
  5. A Note on the Evolving Landscape

Chapter 1: Why Sandboxing? — The Threat Model and the Promise of Isolation

  1. The Cost of Unbounded Execution: Real Incidents
  2. Blast Radius and the Defense-in-Depth Philosophy
  3. A Taxonomy of Isolation Mechanisms
  4. What This Book Will (and Won’t) Cover

Chapter 2: The Kernel as Enforcer — Namespaces, Cgroups, and the Linux Sandboxing Stack

  1. Namespaces: Partitioning What You See
  2. Cgroups: Controlling What You Can Do
  3. User Namespaces and Unprivileged Containers
  4. Composing Isolation: From Primitives to Containers
  5. Limitations and Known Gaps in Linux Isolation

Chapter 3: Mandatory Access Control — SELinux, AppArmor, and Smack

  1. Discretionary vs Mandatory Access Control
  2. SELinux: Architecture and Policy Model
  3. AppArmor: Profile-Based Protection
  4. Smack and Alternative MAC Frameworks
  5. Operational Challenges and Adoption Barriers

Chapter 4: System Call Filtering — seccomp, Landlock, and Capability Dropping

  1. Linux Capabilities: Fine-Grained Privilege Splitting
  2. seccomp-bpf: Filtering the System Call Surface
  3. Landlock: A New Era of Unprivileged Sandboxing
  4. Composing Filters with Capability Dropping
  5. Real-World seccomp Profiles and Case Studies

Chapter 5: eBPF — The Universal Sandbox Primitive

  1. From TCPdump to Trusted Kernel Runtime: The eBPF Revolution
  2. How eBPF Works: Verifier, Programs, and Maps
  3. eBPF for Network and Filesystem Sandboxing
  4. Observability-Driven Security with eBPF
  5. Trust Boundaries and the eBPF Threat Model
  6. The eBPF Security Model in Practice

Chapter 6: Container Runtimes and the OCI Ecosystem

  1. The OCI Standard: Making Containers Portable
  2. Docker Architecture Deep Dive
  3. containerd and CRI-O: Kubernetes-Native Runtimes
  4. Rootless Containers and User Namespace Remapping
  5. Storage Drivers and Image Layers

Chapter 7: Virtual Machines and MicroVMs — Hardware-Level Isolation

  1. Virtualization Fundamentals and the Hypervisor Stack
  2. KVM and QEMU: The Linux Virtualization Foundation
  3. MicroVMs: Firecracker, Crosvm, and the Edge of Performance
  4. Security Comparison: VMs vs Containers
  5. When to Choose Hardware Isolation Over OS-Level Sandboxing

Chapter 8: Desktop and Mobile Sandboxes — macOS, Windows, Android, iOS, and Browsers

  1. macOS Sandbox: Seatbelt and Entitlements
  2. Windows AppContainer and Virtual-Based Sandboxing
  3. Android’s Per-App Isolation Model
  4. iOS Application Sandboxing and Entitlements
  5. Browser Sandboxes: Process Isolation and Site Separation

Chapter 9: Language and Runtime Sandboxes — From chroot to WebAssembly

  1. chroot: The Oldest Trick in the Book
  2. FreeBSD Jails: BSD’s Isolation Philosophy
  3. LXC and LXD: System Containers on Linux
  4. WebAssembly and WASI: Sandboxing at the Bytecode Level
  5. Language and Runtime Sandboxing Approaches

Chapter 10: Sandbox Escapes — How Isolation Fails and What to Do About It

  1. Container Escape Techniques and Case Studies
  2. VM Escape: Hypervisor Vulnerabilities and Side Channels
  3. Browser Sandbox Bypasses
  4. Desktop OS Sandbox Escapes
  5. Defense Strategies and the Ongoing Arms Race

Chapter 11: Designing and Operating Sandboxed Environments

  1. Threat Modeling Your Sandboxing Strategy
  2. Selecting Isolation Technology for Different Workloads
  3. Hardening Container Images and Runtimes
  4. Network Segmentation and Zero-Trust Networking
  5. Observability, Debugging, and Operational Excellence

Chapter 12: The Future of Sandboxing — Serverless, Confidential Computing, and Beyond

  1. Serverless Isolation: The Function-as-a-Service Model
  2. Confidential Computing: When the Kernel Can’t Be Trusted
  3. WebAssembly’s Expanding Sandbox Horizon
  4. The Convergence Playbook: Containers, VMs, and Wasm Together
  5. Open Challenges and Where the Field Is Heading

Conclusion: The Principle of Measured Trust

References

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