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update: Mandatory access control explainer (#2691)

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docs/os/linux-overview.md
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@ -65,7 +65,7 @@ There is often some confusion between “security-focused” distributions and
Arch and Arch-based distributions are not recommended for those new to Linux (regardless of distribution) as they require regular [system maintenance](https://wiki.archlinux.org/title/System_maintenance). Arch does not have a distribution update mechanism for the underlying software choices. As a result you have to stay aware with current trends and adopt technologies on your own as they supersede older practices.
For a secure system, you are also expected to have sufficient Linux knowledge to properly set up security for their system such as adopting a [mandatory access control](https://en.wikipedia.org/wiki/Mandatory_access_control) system, setting up [kernel module](https://en.wikipedia.org/wiki/Loadable_kernel_module#Security) blacklists, hardening boot parameters, manipulating [sysctl](https://en.wikipedia.org/wiki/Sysctl) parameters, and knowing what components they need such as [Polkit](https://en.wikipedia.org/wiki/Polkit).
For a secure system, you are also expected to have sufficient Linux knowledge to properly set up security for their system such as adopting a [mandatory access control](#mandatory-access-control) system, setting up [kernel module](https://en.wikipedia.org/wiki/Loadable_kernel_module#Security) blacklists, hardening boot parameters, manipulating [sysctl](https://en.wikipedia.org/wiki/Sysctl) parameters, and knowing what components they need such as [Polkit](https://en.wikipedia.org/wiki/Polkit).
Anyone using the [Arch User Repository (AUR)](https://wiki.archlinux.org/title/Arch_User_Repository) **must** be comfortable auditing PKGBUILDs that they download from that service. AUR packages are community-produced content and are not vetted in any way, and therefore are vulnerable to software supply chain attacks, which has in fact happened [in the past](https://bleepingcomputer.com/news/security/malware-found-in-arch-linux-aur-package-repository).
@ -82,6 +82,12 @@ Additionally, we recommend **against** these two Arch derivatives specifically:
We recommend **against** using the Linux-libre kernel, since it [removes security mitigations](https://phoronix.com/news/GNU-Linux-Libre-5.7-Released) and [suppresses kernel warnings](https://news.ycombinator.com/item?id=29674846) about vulnerable microcode.
### Mandatory access control
Mandatory access control is a set of additional security controls which help to confine parts of the system such as apps and system services. The two common forms of mandatory access control found in Linux distributions are [SELinux](https://github.com/SELinuxProject) and [AppArmor](https://apparmor.net). While Fedora uses SELinux by default, Tumbleweed [defaults](https://en.opensuse.org/Portal:SELinux) to AppArmor in the installer, with an option to [choose](https://en.opensuse.org/Portal:SELinux/Setup) SELinux instead.
SELinux on [Fedora](https://docs.fedoraproject.org/en-US/quick-docs/selinux-getting-started) confines Linux containers, virtual machines, and service daemons by default. AppArmor is used by the snap daemon for [sandboxing](https://snapcraft.io/docs/security-sandboxing) snaps which have [strict](https://snapcraft.io/docs/snap-confinement) confinement such as [Firefox](https://snapcraft.io/firefox). There is a community effort to confine more parts of the system in Fedora with the [ConfinedUsers](https://fedoraproject.org/wiki/SIGs/ConfinedUsers) special interest group.
## General Recommendations
### Drive Encryption