- Lab
- A Cloud Guru
Linux Kernel Security
Many important security configurations can be set using kernel parameters. In this hands-on lab, we will learn how to find and modify these parameters using various utilities. These skills are essential for passing advanced security certification exams such as the LPIC 303-200 exam.
Path Info
Table of Contents
-
Challenge
Create a Text File for the Kernel Parameters
- Run the following command:
touch /home/cloud_user/investigate.txt -
Challenge
Install the Kernel Documentation
- Run the following command:
sudo yum install kernel-doc -
Challenge
Find and Document the Value of the `randomize_va_space` Parameter
- View the value of the
randomize_va_spaceparameter by running the following command:
sysctl -ar randomize_va- Add the value to the
investigate.txtfile.
sysctl -ar randomize_va >> investigate.txt - View the value of the
-
Challenge
Find and Document the Values of All ICMP Kernel Parameters
- Run the following command:
sysctl –ar icmp >> investigate.txt -
Challenge
Temporarily Disable ICMP Using a Kernel Parameter
- Run the following command:
sudo sysctl –w net.ipv4.icmp_echo_ignore_all=1 -
Challenge
Find and Document the Current Kernel Security Limits
- View the contents of
/etc/security/limits.conf.
vim /etc/security/limits.conf- Write the contents of
/etc/security/limits.conftoinvestigate.txt.
cat /etc/security/limits.conf >> investigate.txt- Locate the current security limits for
cloud_user.
ulimit -a- Write the output of the
ulimit -acommand toinvestigate.txt.
ulimit -a >> investigate.txt - View the contents of
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