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HACKING

doc/extras/HACKING.md

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Testing JtR on BE (big endian) systems

Here are two options for testing JtR on BE (big endian) systems.

GCC Compile Farm account

It is possible to get access to a variety of hardware by applying for a GCC Compile Farm account.

See https://gcc.gnu.org/wiki/CompileFarm for more information.

GCC Compile Farm has PPC64 hardware available which is a big endian architecture.

Local PPC64 Virtual Machine

  1. Install QEMU package. Make sure that you have qemu-system-ppc64 command available.

  2. Download debian-8.9.0-powerpc-CD-1.iso from a Debian mirror.

  3. Create the virtual hard disk image by running,

    qemu-img create -f qcow2 disk.qcow2 8G

  4. Boot the downloaded ISO image, and install Debian by using the following script.

    #!/bin/sh
common_args="-M pseries -cpu POWER8E -smp 4 -m 2G --accel tcg,thread=multi \
    -drive file=disk.qcow2,if=virtio,format=qcow2,index=0 \
    -netdev user,id=net0 -device e1000-82545em,netdev=net0,id=net0,mac=52:54:00:c8:19:17 \
    -redir tcp:2222::22"

# qemu-system-ppc64 $common_args -cdrom debian-8.9.0-powerpc-CD-1.iso -boot d  # for installation

qemu-system-ppc64 $common_args  # for normal use

    These instructions were tested with QEMU 2.10. I am not sure if the SMP acceleration is working well.

  5. To enable Debian software repositories in the VM, modify /etc/apt/sources.list to include the following lines,

    deb http://mirrors.kernel.org/debian/ jessie main
deb-src http://mirrors.kernel.org/debian/ jessie main

deb http://security.debian.org/ jessie/updates main
deb-src http://security.debian.org/ jessie/updates main

    Here is an alternate sources.list file, generated from https://debgen.simplylinux.ch/index.php?generate

    deb http://deb.debian.org/debian/ oldstable main contrib non-free
deb-src http://deb.debian.org/debian/ oldstable main contrib non-free

deb http://deb.debian.org/debian/ oldstable-updates main contrib non-free
deb-src http://deb.debian.org/debian/ oldstable-updates main contrib non-free

deb http://deb.debian.org/debian-security oldstable/updates main
deb-src http://deb.debian.org/debian-security oldstable/updates main

deb http://ftp.debian.org/debian jessie-backports main
deb-src http://ftp.debian.org/debian jessie-backports main

    and then run su -c "apt-get update".

  6. Install the required software packages,

    $ su -c "apt-get install build-essential gdb ctags libssl-dev sudo vim git openssh-server gcc-multilib -y"

    Enable sudo for the local user.

    $ su -c "/usr/sbin/usermod -a -G sudo <username>"

    See INSTALL-UBUNTU file for more information on this topic.

  7. SSH from the host machine to the VM machine by executing ssh -p2222 <username>@localhost.

References