Landlock: unprivileged access control

The goal of Landlock is to enable to restrict ambient rights (e.g. global filesystem access) for a set of processes. Because Landlock is a stackable LSM, it makes possible to create safe security sandboxes as new security layers in addition to the existing system-wide access-controls. This kind of sandbox is expected to help mitigate the security impact of bugs or unexpected/malicious behaviors in user space applications. Landlock empowers any process, including unprivileged ones, to securely restrict themselves.

Mailing list dedicated to user space development involving Landlock: subscription, posting and archives.

News

• Newsletter (2021-09-01) - Landlock news #1

• LWN article (2021-06-17) - Landlock (finally) sets sail

Conferences

• Open Source Summit (2021-09-28) - Sandboxing Applications with Landlock – slides and recording

• Linux Security Summit (2021-09-29) - Deep Dive into Landlock Internals – slides and recording

Roadmap (kernel-side)

Short term:

• improve kernel performance for the current features;

• add the ability to change the parent directory of files (see current Landlock limitations).

Medium term:

• add audit features to ease debugging;

• extend filesystem access-control types to address the current limitations;

• add the ability to follow a deny listing approach, which is required for some use cases.

Long term:

• add minimal network access-control types;

• add the ability to create (file descriptor) capabilities compatible with Capsicum.

[PATCH v34] – Landlock LSM

Note

Merged in mainline: will be available in Linux 5.13!

LKML – code – sandbox manager example – tests – documentation – LCOV coverage – syzkaller coverage

GNU Tar – [PATCH v1] Landlock support

patch – code

External links

Twitter – GitHub

Archives

Warning

Landlock is not based on eBPF anymore. These talks are outdated but kept for reference.

Summary 2019 – Landlock: a new kind of Linux Security Module leveraging eBPF

Slides

Linux Security Summit 2018 – How to safely restrict access to files in a programmatic way with Landlock?

Abstract – Slides – Demo video #1 (web server) – Demo video #2 (dynamic map update) – Demo code

Pass the SALT 2018 – Internals of Landlock: a new kind of Linux Security Module leveraging eBPF

Abstract and video – Slides – Demo video #1 (web server) – Demo video #2 (dynamic map update) – Demo code

FOSDEM 2018 – File access-control per container with Landlock

Abstract and video – Slides – Demo video – Demo code

Linux Security Summit 2017 – Landlock LSM: toward unprivileged sandboxing

Slides – Demo #1 – Demo #2