https://github.com/jvns/kernel-module-fun

Some fun things you can do with kernel modules (all "bad ideas")
https://github.com/jvns/kernel-module-fun

Last synced: 3 days ago
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Some fun things you can do with kernel modules (all "bad ideas")

• Host: GitHub
• URL: https://github.com/jvns/kernel-module-fun
• Owner: jvns
• License: mit
• Created: 2013-10-08T19:12:20.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2022-04-13T20:54:48.000Z (almost 3 years ago)
• Last Synced: 2025-02-11T09:26:59.121Z (10 days ago)
• Language: C
• Homepage:
• Size: 11.7 KB
• Stars: 437
• Watchers: 28
• Forks: 113
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
Kernel module fun

=================

## Motivation

I didn't know at all how kernel modules worked. This is me learning

how. This is all tested using the `3.5.0-18` kernel.

## Contents

**`hello.c`**: a simple "hello world" module

**`hello-packet.c`**: logs every time your computer receives a packet.

  This one could easily be modified to drop packets 50% of the time.

**`rootkit.c`**: A simple rootkit.

  [blog post explaining it more](http://jvns.ca/blog/2013/10/08/day-6-i-wrote-a-rootkit/)

## Compiling them

I'm running Linux `3.5.0-18`. (run `uname -r`) to find out what you're

using. This almost certainly won't work with a `2.x` kernel, and I

don't know enough. It is unlikely to do any lasting damage to your

computer, but I can't guarantee anything.

I have my kernel sources set up in `/lib/modules/3.5.0-18-generic`. I

think I only needed to run

```

sudo apt-get install linux-headers-3.5.0-18-generic

```

but I don't remember for sure. If you try this out, I'd love to hear.

To compile them, just run

```

make

```

## Inserting into your kernel (at your own risk!)

```

sudo insmod hello.ko

dmesg | tail

```

should display the "hello world" message