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Harden the loading of new modules to the kernel after install #148

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Merged
adrelanos merged 6 commits into from
Nov 5, 2023
Merged

Harden the loading of new modules to the kernel after install #148

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3e60461
harden-module-loading.service
monsieuremre Nov 2, 2023
9f06358
disable-kernel-module-loading
monsieuremre Nov 2, 2023
07882f6
enable service on install
monsieuremre Nov 2, 2023
a187d23
big fix
monsieuremre Nov 4, 2023
19eceaa
more fix
monsieuremre Nov 4, 2023
2e64d89
undo unnecessary manual activation
monsieuremre Nov 4, 2023
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14 changes: 14 additions & 0 deletions lib/systemd/system/harden-module-loading.service
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Original file line number Diff line number Diff line change
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[Unit]
Description=Disable the loading of modules to the kernel after startup. This could be malicious.
After=systemd-modules-load.service
Before=sysinit.target
# This functionality is implemented with this and not directly in the sysctl config is
# to allow systemd-modules-load.service to load the modules with no problem but
# to disallow anyone else do the same after the system boots up.

[Service]
Type=oneshot
ExecStart=/usr/libexec/security-misc/disable-kernel-module-loading

[Install]
WantedBy=sysinit.target
5 changes: 5 additions & 0 deletions usr/libexec/security-misc/disable-kernel-module-loading
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#!/bin/bash

sysctl -w kernel.modules_disabled=1

echo "The loading of new modules to the kernel has been disabled by security-misc"