Landlock is a Linux Security Module (LSM) that provides a flexible, unprivileged sandboxing mechanism for applications. Unlike traditional LSMs such as SELinux and AppArmor, which enforce mandatory access control policies set by system administrators, Landlock allows applications to define their own security restrictions. This makes it a powerful tool for developers seeking to add additional security layers without requiring elevated privileges.
Key Features
- Unprivileged Sandboxing: Landlock enables applications to apply security restrictions without requiring root access or administrative intervention.
- Filesystem Access Control: Developers can define which files and directories an application can access.
- Incremental Restrictions: A process can only tighten its access permissions over time, preventing privilege escalation.
- Composability: Can be used in combination with other LSMs such as SELinux and AppArmor for enhanced security.
- User-Space Control: Allows developers to enforce security policies dynamically within their applications.
How Landlock Works
Landlock uses a set of security rules that define what resources an application can access. These rules are enforced at the kernel level and prevent applications from performing unauthorized actions. Unlike traditional access control mechanisms, Landlock works on a per-process basis, meaning individual applications can define and enforce their own security policies without affecting the rest of the system.
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