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Tomoyo Linux

Tomoyo Linux 2.x Domain Policy Editor
Original author	NTT Data Corporation
Operating system	Linux
Type	Mandatory access control
License	GPLv2
Website	tomoyo.sourceforge.net
Repository	svn.code.sf.net/p/tomoyo/svn/

Tomoyo Linux (stylised as TOMOYO Linux) is a Linux kernel security module which implements mandatory access control (MAC).

Overview

Tomoyo Linux is a MAC implementation for Linux that can be used to increase the security of a system, while also being useful purely as a systems analysis tool. It was launched in March 2003 and was sponsored by NTT Data Corporation until March 2012.^[1]

Tomoyo Linux focuses on system behaviour. Tomoyo Linux allows each process to declare behaviours and resources needed to achieve their purpose. When protection is enabled, Tomoyo Linux restricts each process to the behaviours and resources allowed by the administrator.

Features

The main features of Tomoyo Linux include:

System analysis
Increased security through Mandatory Access Control
Automatic policy generation
Simple syntax
Ease of use

History and versions

Tomoyo was merged in Linux Kernel mainline version 2.6.30 (2009, June 10)/^[2] It is currently one of four standard Linux Security Modules (LSM), along with SELinux, AppArmor and SMACK.

The Tomoyo Linux project started as a patch for the Linux kernel to provide MAC. Porting Tomoyo Linux to the mainline Linux kernel required the introduction of hooks^[3] into the LSM that had been designed and developed specifically to support SELinux and its label-based approach.

However, more hooks are needed to integrate the remaining MAC functionality of Tomoyo Linux. Consequently, the project is following two parallel development lines:

Tomoyo Linux 1.x, original version

uses purposely created non-standard hooks
fully featured MAC
released as a patch for Linux kernel – Since this version 1.x does not depend on LSM, it can be used with Linux kernel 2.6 (starting from version 2.6.11) as well as 2.4.
latest version: 1.7.1

Tomoyo Linux 2.x, mainline version

uses standard LSM hooks
fewer features
integral part of Linux kernel version 2.6.30
latest version: 2.5.0 included in Linux kernel 3.2

Akari (stylised as AKARI), Tomoyo 1.x fork

uses standard LSM hooks
fewer features than Tomoyo 1.x, but more than Tomoyo 2.x
released as LKM (Loadable Kernel Module), so no recompilation of the kernel is necessary

Naming

The name 'TOMOYO' is, officially speaking, a backronym for "Task Oriented Management Obviates Your Onus". According to one of the developers Tetsuo Handa, it's also a reference to the character Tomoyo Daidouji from Cardcaptor Sakura.^[4]

References

↑ "Tomoyo Linux Home Page". Tomoyo.sourceforge.net. Retrieved 2025-05-26.
↑ "Tomoyo Linux, an alternative Mandatory Access Control". Linux 2 6 30. Linux Kernel Newbies.
↑ "Tomoyo #14 patch submission to LKML". LWN.net.
↑ "QandA - TOMOYO Linux Wiki". Archived from the original on 2015-12-25.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=Tomoyo_Linux&oldid=1292289573"

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