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expand documentation on kernel.unprivileged_userns_clone=0 sysctl

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https://github.com/Kicksecure/security-misc/issues/274
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Patrick Schleizer 2024-10-03 02:44:06 -04:00
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usr/lib/sysctl.d/990-security-misc.conf
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@ -119,22 +119,34 @@ kernel.sysrq=0
## User namespaces aim to improve sandboxing and accessibility for unprivileged users.
## Unprivileged user namespaces pose substantial privilege escalation risks.
## Restricting may lead to breakages in numerous software packages.
##
## Flatpak requires unprivileged users to create new user namespaces for sandboxing.
## Uncomment the second sysctl to entirely disable user namespaces.
## https://github.com/flatpak/flatpak/wiki/User-namespace-requirements
## https://salsa.debian.org/debian/bubblewrap/-/blob/debian/latest/debian/README.Debian
## https://forums.kicksecure.com/t/can-not-run-flatpak-apps-after-kicksecure-update/592
##
## Disabling entirely will reduce compatibility with some AppArmor profiles.
## Disabling entirely is known to break the UPower systemd service.
##
## Also breaks (some?) AppImages.
## https://forums.kicksecure.com/t/cannot-run-some-appimage-apps-after-kicksecure-upate/594
##
## Might also break evolution (e-mail client):
## https://forums.kicksecure.com/t/impossible-to-start-evolution-app-since-the-last-update/601
##
## https://lwn.net/Articles/673597/
## https://madaidans-insecurities.github.io/linux.html#kernel
## https://github.com/a13xp0p0v/kernel-hardening-checker#questions-and-answers
## https://github.com/NixOS/nixpkgs/pull/84522#issuecomment-614640601
## https://github.com/flatpak/flatpak/wiki/User-namespace-requirements
## https://github.com/Kicksecure/security-misc/pull/263
## https://github.com/Kicksecure/security-misc/issues/274
##
## KSPP=partial
## KSPP sets the stricter sysctl user.max_user_namespaces=0.
## KSPP sets sysctls kernel.unprivileged_userns_clone=0 and user.max_user_namespaces=0.
##
kernel.unprivileged_userns_clone=0
## Uncomment the following sysctl to entirely disable user namespaces.
#user.max_user_namespaces=0
## Restricts kernel profiling to users with CAP_PERFMON.