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Replace Kicksecure kmod blacklist with secureblue's and move disclaimer about Kicksecure morphing

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10
content/posts/linux/Desktop Linux Hardening.md
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@ -277,7 +277,7 @@ If you are using non&#8209;classic Snap packages on a system that [supports prop
### Kernel Hardening
There are several things you can do to harden the Linux kernel, including setting appropriate [kernel parameters](https://wiki.archlinux.org/title/Kernel_parameters) and blacklisting unnecessary kernel modules.
There are several things you can do to harden the Linux kernel, including setting appropriate [kernel parameters](https://wiki.archlinux.org/title/Kernel_parameters) and blacklisting unnecessary kernel modules. If you are using Kicksecure or Whonix, most of this hardening is included by default. If you are using Debian, you should consider [morphing it into Kicksecure](https://www.kicksecure.com/wiki/Debian).
_This section extensively references [Madaidan's Linux Hardening Guide](https://madaidans-insecurities.github.io/guides/linux-hardening.html) and in the interest of brevity does not repeat all the information contained there. You are strongly encouraged to read through the relevant sections of Madaidan's guide (linked for convenience)._
@ -287,11 +287,11 @@ _See ["2.2&nbsp;Sysctl"](https://madaidans-insecurities.github.io/guides/linux-h
Madaidan recommends that you disable [unprivileged user namespaces](https://github.com/sangam14/CloudNativeLab/blob/master/LXC/Linux%20Containers/User_namespaces.md) due to the [significant attack surface for privilege escalation](https://madaidans-insecurities.github.io/linux.html#kernel). However, some software such as Podman and LXC relies on unprivileged user namespaces. If you wish to use such software, do not disable `kernel.unprivileged_userns_clone`. Note that this setting does not exist in the upstream kernel and is added downstream by some distributions.
If you are using Kicksecure or Whonix, most of this hardening is included by default. If you are using Debian, you should consider [morphing it into Kicksecure](https://www.kicksecure.com/wiki/Debian). On other distributions, you can copy the configuration file from [Tommy's repository](https://github.com/TommyTran732/Linux-Setup-Scripts/blob/main/etc/sysctl.d/99-workstation.conf).
On distributions other than Whonix and Kicksecure, you can copy the configuration file from [Tommy's repository](https://github.com/TommyTran732/Linux-Setup-Scripts/blob/main/etc/sysctl.d/99-workstation.conf).
#### Boot Parameters
_See ["2.3&nbsp;Boot parameters"](https://madaidans-insecurities.github.io/guides/linux-hardening.html#boot-parameters) in Madaidan's guide and [Kicksecure boot parameters](https://github.com/Kicksecure/security-misc/tree/master/etc/default/grub.d). If desired, [formal documentation of boot parameters](https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html) is available upstream._
_See ["2.3&nbsp;Boot parameters"](https://madaidans-insecurities.github.io/guides/linux-hardening.html#boot-parameters) in Madaidan's guide. If desired, [formal documentation of boot parameters](https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html) is available upstream._
Copy these parameters into [your bootloader's configuration](https://wiki.archlinux.org/title/Kernel_parameters#Configuration). On rpm&#8209;ostree distributions, make sure to use `rpm-ostree kargs` rather than editing GRUB configuration directly.
@ -355,14 +355,12 @@ Further reading:
_See ["2.5.2&nbsp;Blacklisting kernel modules"](https://madaidans-insecurities.github.io/guides/linux-hardening.html#kasr-kernel-modules) in Madaidan's guide._
Once again, Kicksecure includes this hardening by default and provides a config file which can be used on other distros: [`/etc/modprobe.d/30_security-misc.conf`](https://github.com/Kicksecure/security-misc/blob/master/etc/modprobe.d/30_security-misc.conf)
On distributions other than Whonix and Kicksecure, you can copy the configuration file from [secureblue's repository](https://github.com/secureblue/secureblue/blob/live/config/files/usr/etc/modprobe.d/blacklist.conf) into `/etc/modprobe.d/`.
There are a few things in this config to keep in mind:
- Thunderbolt is disabled. Comment out the `install thunderbolt` line to use Thunderbolt devices.
- The `cdrom` and `sr_mod` modules are merely _blacklisted_ (can still be loaded at runtime with `modprobe`). If you have no intention to ever use CD&#8209;ROM devices, they should be _disabled_ by *un*commenting the respective `install` lines. ([More about how this works on the ArchWiki](https://wiki.archlinux.org/title/Kernel_module#Using_files_in_/etc/modprobe.d/_2))
- Apple filesystems are disabled. While generally fine on non&#8209;Apple systems, if you are using an Apple device you **must** check the filesystem of your EFI partition and comment out the relevant `install` line, otherwise your Linux install will not boot. For example, comment out the `install hfsplus` line if your ESP filesystem is HFS+.
- To produce informative errors when utilising the configuration file, all 10 of the corresponding [debugging scripts](https://github.com/Kicksecure/security-misc/tree/master/usr/bin) should be copied into `/bin/`.
#### Restricting access to /proc and /sys