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docs/linux: add instructions for fuzzing on VMware hosted hypervisors

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Add new page for fuzzing x86-64 Linux kernel on VMware VMs.
It explains how to create a VMDK image and how to run it on Ubuntu host
with Workstation installed. For now only the isolated mode of syzkaller
is supported.
This commit is contained in:
Radoslav Gerganov 2020-08-31 17:09:25 +03:00 committed by Dmitry Vyukov
parent 287cd75a6d
commit b70f2394ec
3 changed files with 82 additions and 1 deletions
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3
CONTRIBUTORS
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@ -74,4 +74,5 @@ Matthew Halchyshak
Heyuan Shi
Marijo Simunovic
Jouni Högander
VMware
Radoslav Gerganov

1
docs/linux/setup.md
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@ -11,6 +11,7 @@ Instructions for a particular VM type or kernel architecture can be found on the
- [Setup: Linux host, QEMU vm, s390x kernel](setup_linux-host_qemu-vm_s390x-kernel.md)
- [Setup: Linux host, Android device, arm32/64 kernel](setup_linux-host_android-device_arm-kernel.md)
- [Setup: Linux isolated host](setup_linux-host_isolated.md)
- [Setup: Ubuntu host, VMware vm, x86-64 kernel](setup_ubuntu-host_vmware-vm_x86-64-kernel.md)
- [Setup: Ubuntu host, Odroid C2 board, arm64 kernel](setup_ubuntu-host_odroid-c2-board_arm64-kernel.md) [outdated]
## Install

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docs/linux/setup_ubuntu-host_vmware-vm_x86-64-kernel.md Normal file
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# Setup: Ubuntu host, VMware vm, x86-64 kernel
These are the instructions on how to fuzz the x86-64 kernel in VMware Workstation with Ubuntu on the host machine and Debian Stretch in the virtual machines.
In the instructions below, the `$VAR` notation (e.g. `$GCC`, `$KERNEL`, etc.) is used to denote paths to directories that are either created when executing the instructions (e.g. when unpacking GCC archive, a directory will be created), or that you have to create yourself before running the instructions. Substitute the values for those variables manually.
## GCC and Kernel
You can follow the same [instructions](/docs/linux/setup_ubuntu-host_qemu-vm_x86-64-kernel.md) for obtaining GCC and building the Linux kernel as when using QEMU.
## Image
Install debootstrap:
``` bash
sudo apt-get install debootstrap
```
To create a Debian Stretch Linux user space in the $USERSPACE dir do:
```
mkdir -p $USERSPACE
sudo debootstrap --include=openssh-server,curl,tar,gcc,libc6-dev,time,strace,sudo,less,psmisc,selinux-utils,policycoreutils,checkpolicy,selinux-policy-default,firmware-atheros,open-vm-tools --components=main,contrib,non-free stretch $USERSPACE
```
Note: it is important to include the `open-vm-tools` package in the user space as it provides better VM management.
To create a Debian Stretch Linux VMDK do:
```
wget https://raw.githubusercontent.com/google/syzkaller/master/tools/create-gce-image.sh -O create-gce-image.sh
chmod +x create-gce-image.sh
./create-gce-image.sh $USERSPACE $KERNEL/arch/x86/boot/bzImage
qemu-img convert disk.raw -O vmdk disk.vmdk
```
The result should be `disk.vmdk` for the disk image and `key` for the root SSH key. You can delete `disk.raw` if you want.
## VMware Workstation
Open VMware Workstation and start the New Virtual Machine Wizard.
Assuming you want to create the new VM in `$VMPATH`, complete the wizard as follows:
* Virtual Machine Configuration: Custom (advanced)
* Hardware compatibility: select the latest version
* Guest OS: select "I will install the operating system later"
* Guest OS type: Linux
* Virtual Machine Name and Location: select `$VMPATH` as location and "debian" as name
* Processors and Memory: select as appropriate
* Network connection: NAT
* I/O Controller Type: LSI Logic
* Virtual Disk Type: IDE
* Disk: select "Use an existing virtual disk"
* Existing Disk File: enter the path of `disk.vmdk` created above
When you complete the wizard, you should have `$VMPATH/debian.vmx`. From this point onward, you no longer need the Workstation UI.
Starting the Debian VM (headless):
``` bash
vmrun start $VMPATH/debian.vmx nogui
```
Getting the IP address of the Debian VM:
``` bash
vmrun getGuestIPAddress $VMPATH/debian.vmx -wait
```
SSH into the VM:
``` bash
ssh -i key root@<vm-ip-address>
```
Stopping the VM:
``` bash
vmrun stop $VMPATH/debian.vmx
```
## syzkaller
Once you start the VM and get its IP address, you can use syzkaller to fuzz the VM in [isolated](/docs/linux/setup_linux-host_isolated.md) mode.