Kernel

Sysctl: ipe.success_audit

Sysctl key ipe.success_audit key is used to define if audit events should be created when using the Linux security module IPE (Integrity Policy Enforcement).

Sysctl: ipe.enforce

The sysctl key ipe.enforce defines the mode of the Linux security module IPE (Integrity Policy Enforcement). Learn about the possible values and their meaning.

Ipe

Learn about the sysctl command and the values related to the IPE (Integrity Policy Enforcement) module.

What is the difference between /dev/random and /dev/urandom?

Learn the difference between Linux kernel random sources /dev/random and /dev/urandom, and when to use which one. Spoiler: probably /dev/urandom.

Net

Learn about the sysctl command and the values related to the network class.

Sysctl: net.ipv4.ip_forward

The sysctl key net.ipv4.ip_forward key is used to define IP forwarding of IPv4 network packets. Learn about the possible values of this key and their meaning.

Sysctl: kernel.perf_event_paranoid

Secure the Linux kernel with the help of the sysctl kernel.perf_event_paranoid key, including the possible values and their meaning.

What is a tainted kernel

The Linux kernel is marked tainted when a specific event happened that could impact reliable troubleshooting of kernel issues. Learn about the relevant events.

How to find the specific cause of a tainted kernel

The Linux kernel can mark itself as being 'tainted'. Learn what it means when the Linux kernel is tainted and in particular the underlying cause.

Sysctl

Learn about the sysctl command and how it can help with kernel tunables to alter the system configuration and perform additional security hardening.

Kernel

Learn about the sysctl command and the values related to the kernel class.

Kernel.tainted

Improve the Linux security by understanding and configuring the sysctl kernel.tainted key, including the possible values and their meaning.

Livepatch: Linux kernel updates without rebooting

Livepatch is a feature to do live kernel patching for Linux systems. It allows applying security updates without rebooting the system. Learn how it works!

Linux and ASLR: kernel/randomize_va_space

ASLR protects the Linux kernel and programs against different attacks. It can be tuned with the randomize_va_space setting to provide different protections.

Linux hardening with sysctl settings

The Linux kernel can be secured with the help of kernel tunables called sysctl keys. Learn how system hardening principles can be applied using sysctl.

Monitor file access by Linux processes

Linux is powerful with the help of small utilities like lsof and strace. They help with monitoring disk and file activity, of new and running processes.

Linux kernel security and how to improve it

Every system is as strong as its weakest link, especially the system kernel. This article explains Linux kernel security, what we can do and how to do so.