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Merge pull request #263 from raja-grewal/max_user_namespaces

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Provide option to disable user namespaces
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Patrick Schleizer 2024-08-25 11:00:51 -04:00 committed by GitHub
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2
README.md
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@ -36,7 +36,7 @@ Kernel space:
can no longer be utilized. See [documentation](https://www.kicksecure.com/wiki/SysRq). can no longer be utilized. See [documentation](https://www.kicksecure.com/wiki/SysRq).
- Restrict user namespaces to `CAP_SYS_ADMIN` as they can lead to substantial - Restrict user namespaces to `CAP_SYS_ADMIN` as they can lead to substantial
privilege escalation. privilege escalation. Optional - Disable all use of user namespaces.
- Restrict kernel profiling and the performance events system to `CAP_PERFMON`. - Restrict kernel profiling and the performance events system to `CAP_PERFMON`.

9
usr/lib/sysctl.d/990-security-misc.conf
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@ -93,11 +93,20 @@ kernel.sysrq=0
## User namespaces aim to improve sandboxing and accessibility for unprivileged users. ## User namespaces aim to improve sandboxing and accessibility for unprivileged users.
## 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.
## 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 sets the stricter sysctl user.max_user_namespaces=0.
## ##
kernel.unprivileged_userns_clone=0 kernel.unprivileged_userns_clone=0
#user.max_user_namespaces=0
## Restricts kernel profiling to users with CAP_PERFMON. ## Restricts kernel profiling to users with CAP_PERFMON.
## The performance events system should not be accessible by unprivileged users. ## The performance events system should not be accessible by unprivileged users.