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Prozess A                     Prozess B
f = open('/var/mail/foo')
                              mv /var/mail/foo /var/mail/bar
                              cat /var/mail/bar >> /var/mail/baz
f.write(important_mail)
f.close()
                              rm /var/mail/bar

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[root@hermes nihilus]# su - dropoff  # <- This is the only line ever entered on a keyboard
exit
echo "Running exploit as $(whoami)"
[dropoff@hermes ~]$ exit
logout
[root@hermes nihilus]# echo "Running exploit as $(whoami)"
Running exploit as root
[root@hermes nihilus]# 

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#!/bin/sh

set -e

if [ x"$1" = x"" -o ! -d "/var/chroot/$1" ]; then
	echo "Usage: $0 <chroot>" >&2
	exit 1
fi

cd /var/chroot/$1

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from PIL import Image

img = Image.open(image_path)
if orientation == 2:
    img = img.transpose(Image.FLIP_LEFT_RIGHT)
elif orientation == 3:
    img = img.transpose(Image.ROTATE_180)
elif orientation == 4:
    img = img.transpose(Image.FLIP_TOP_BOTTOM)
elif orientation == 5:

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find . -type f -exec grep -l debian-installer/ {} + | xargs -n 1 sed -i -e 's_debian-installer/_netboot/debian-jessie/_g'

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#
# export DEST as E164 number and MSG as text message content
# then call:
#
#    comgt -v -d /dev/ttyUSB2 /etc/gcom/sendmsg.gcom
#
# where /dev/ttyUSB2 is the console of your UMTS modem
#
opengt
 set com 115200n81

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Introduction

FreeNAS 9.10 is based on FreeBSD 10.3 and as such, supports the BSD hypervisor bhyve. There are different frontends for bhyve, one of them is iohyve which is included in FreeNAS 9.10. This document describes how to setup iohyve for operation on FreeNAS 9.10 and basic VM management tasks.

Setting up Iohyve

Iohyve is already installed in FreeNAS 9.10, so it only needs to be enabled. This is done by adding the following lines to /conf/base/etc/rc.conf:

iohyve_enable="YES"

iohyve_flags="kmod=1 net=igb0 pool=storage-volume"

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Automate slow Device over Serial

This describes how to push data to a device which doesn't react kindly when flooded with input.

It uses screen.

It is a hack.

It could be used for provisioning switches with config.

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Dropping the Docker

Based on this guide

We differ from the official docs by creating the btrfs before installing docker-ce.

Also we assume this is done as root.

Apperently, we can save ourself the effort to shuffle stuff around afterwards and have docker use the btrfs as intended, immediately after installation.

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Memtest on USB flash drive

Using Memtest86 Free Edition

At the time of writing, this installed V7.4 for UEFI and V4 for BIOS boot.

Caution: you have to use the correct device name for your flashdrive

wget https://www.memtest86.com/downloads/memtest86-usb.tar.gz