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Add details on user namespaces

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Raja Grewal 2024-08-18 13:53:11 +10:00
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usr/lib/sysctl.d/990-security-misc.conf
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@ -94,9 +94,13 @@ kernel.sysrq=0
## Unprivileged user namespaces pose substantial privilege escalation risks. ## Unprivileged user namespaces pose substantial privilege escalation risks.
## Restricting may lead to breakages in numerous software packages. ## Restricting may lead to breakages in numerous software packages.
## Uncomment the second sysctl to entirely disable user namespaces. ## Uncomment the second sysctl to entirely disable user namespaces.
## Disabling entirely will reduce compatibility with some AppArmor profiles.
## ##
## https://lwn.net/Articles/673597/
## https://madaidans-insecurities.github.io/linux.html#kernel ## https://madaidans-insecurities.github.io/linux.html#kernel
## https://github.com/a13xp0p0v/kernel-hardening-checker#questions-and-answers ## https://github.com/a13xp0p0v/kernel-hardening-checker#questions-and-answers
## https://github.com/NixOS/nixpkgs/pull/84522#issuecomment-614640601
## https://github.com/Kicksecure/security-misc/pull/263
## ##
## KSPP=partial ## KSPP=partial
## KSPP sets the stricter sysctl user.max_user_namespaces=0. ## KSPP sets the stricter sysctl user.max_user_namespaces=0.