hardened.md

!meta title="Hardened OS" !tag research hardened grsecurity security

grsecurity

Basic install:

sudo apt-get -t jessie-backports install linux-image-4.9.0-2-grsec-amd64 linux-image-grsec-amd64
sudo apt-get install paxtest
sudo usermod -aG grsec-tpe `whoami`

As root:

echo "kernel.grsecurity.rwxmap_logging = 0" > /etc/sysctl.d/kernel.grsecurity.rwxmap_logging.conf 
echo "kernel.grsecurity.grsec_lock = 1"     > /etc/sysctl.d/kernel.grsecurity.grsec_lock.conf

As regular user, after reboot:

paxctl -cm /usr/bin/git-annex
paxctl -cm /usr/bin/qemu-img
paxctl -cm /usr/bin/qemu-system-x86_64

Further research

LXC unprivileged containers for GUI applications:

• LXC 1.0: GUI in containers [9/10] | Stéphane Graber's website.
• Configuring Unprivileged LXC containers in Debian Jessie.
• LXC - Debian Wiki.

References

• https://micahflee.com/2016/01/debian-grsecurity/
• https://nixaid.com/grsec-in-docker/
• https://hardenedlinux.github.io/