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Update the Linux pages (#1307)

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Signed-off-by: Daniel Gray <dng@disroot.org>
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Tommy
2022-05-25 11:14:43 +00:00
committed by Daniel Gray
parent f7a55480fb
commit 631b2d2e14
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docs/linux-desktop/hardening.en.md
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@@ -28,19 +28,29 @@ There are some additional kernel hardening options such as configuring [sysctl](
- [Recommended boot parameters](https://madaidans-insecurities.github.io/guides/linux-hardening.html#boot-parameters)
- [Additional recommendations to reduce the kernel's attack surface](https://madaidans-insecurities.github.io/guides/linux-hardening.html#kernel-attack-surface-reduction)
Note that setting `kernel.unprivileged_userns_clone=0` will stop Flatpak, Snap (that depend on browser-sandbox), Electron based AppImages, Podman, Docker, and LXC containers from working. Do **not** set this flag if you are using container products.
Do **not** disable unprivileged user namespaces if you use software that relies on it, like: Podman, Docker and LXC containers. The option will prevent this software from working.
## Linux-Hardened
Some distributions like Arch Linux have the [linux-hardened](https://github.com/anthraxx/linux-hardened), kernel package. It includes [hardening patches](https://wiki.archlinux.org/title/security#Kernel_hardening) and more security-conscious defaults. Linux-Hardened has `kernel.unprivileged_userns_clone=0` disabled by default. See the [warning above](#kernel-hardening) about how this might impact you.
## Linux Kernel Runtime Guard (LKRG)
LKRG is a kernel module that performs runtime integrity check on the kernel to help detect detect exploits against the kernel. LKRG works in a *post*-detect fashion, meaning that it attempts to respond to unauthorized modifications to the running Linux kernel. The intention is that it will defeat many pre-existing exploits as well as undiscovered vulnerabilities. Some hardened distributions, such as [Kicksecure](https://www.kicksecure.com/wiki/Linux_Kernel_Runtime_Guard_LKRG), have documentation.
## GRSecurity
GRSecurity is a set of kernel patches that attempt to improve security of the Linux kernel. Open source access, however, requires [subscription to a paid model](https://grsecurity.net/passing_the_baton).
## Simultaneous multithreading (SMT)
[SMT](https://en.wikipedia.org/wiki/Simultaneous_multithreading) has been the cause of numerous hardware vulnerabilities, and subsequent patches for those vulnerabilities often come with performance penalties that negate most of the performance gain given by SMT. If you followed the “kernel hardening” section above, some kernel parameters already disable SMT. If the option is available to you, we recommend that you disable it in your firmware as well.
## Hardened memory allocator
The [hardened memory allocator](https://github.com/GrapheneOS/hardened_malloc) from [GrapheneOS](https://grapheneos.org) can be used on Linux distributions. It is available by default on Whonix and is available as an [AUR package](https://wiki.archlinux.org/title/Security#Hardened_malloc) on Arch based distributions. If you are using the AUR package, consider setting up `LD_PRELOAD` as described in the [Arch Wiki](https://wiki.archlinux.org/title/Security#Hardened_malloc).
The [hardened memory allocator](https://github.com/GrapheneOS/hardened_malloc) from [GrapheneOS](https://grapheneos.org) can also be used on general Linux distributions. It is available as an [AUR package](https://wiki.archlinux.org/title/Security#Hardened_malloc) on Arch based distributions, and (though not enabled by default) on Whonix and Kicksecure.
If you are using Whonix, Kicksecure or the AUR package, consider setting up `LD_PRELOAD` as described in the [Kicksecure Documentation](https://www.kicksecure.com/wiki/Hardened_Malloc) or [Arch Wiki](https://wiki.archlinux.org/title/Security#Hardened_malloc).
## Umask