Specialized Cybersecurity & Cognitive Security
Linux Kernel Hardening with LSMs
Linux security modules enforce mandatory access control below the application layer, so even a compromised process is constrained by policy. SELinux, AppArmor, and newer eBPF-based modules each take a different approach to confinement. The value is real, but only if policies are maintained and tested, because a stale or permissive policy gives a false sense of safety.
Головне
- Enable an LSM at boot and confirm it is enforcing, not just in permissive mode.
- Start with a baseline policy and tighten it based on observed application behavior.
- Use eBPF-based tools for dynamic, programmatic enforcement where static policy is too coarse.
- Protect kernel attack surfaces by disabling unused modules, sysctls, and debug interfaces.
- Apply kernel and microcode updates promptly, since many exploits target the kernel itself.
- Log denials and review them regularly to catch both attacks and policy gaps.
- Test policies in staging with real workloads before enforcing in production.
- Document exceptions so temporary relaxations do not become permanent.
Часті запитання
SELinux or AppArmor?
SELinux is more granular; AppArmor is simpler to write. Choose based on team skill and distribution defaults.
Do LSMs slow the system?
Usually slightly; measure on your workload before assuming.
Can eBPF replace SELinux?
It complements it with dynamic rules, but it is not a full policy framework on its own.
What is the biggest hardening mistake?
Leaving the module in permissive mode and calling it done.
Допомога Kinetikatech: specialized cybersecurity & cognitive security
Чесно: більшість команд приходить до нас, попередньо спробувавши все самі: Niche but high-impact defenses that span AI attack surfaces, hardware trust, cognitive warfare, and the systems that keep critical infrastructure and data safe. Служба Тести на проникнення та Безпека серверів Linux існує, щоб не доводилося опановувати specialized cybersecurity & cognitive security гірким досвідом — налаштування, нагляд і нічні сюрпризи о третій беремо на себе.