ROCALL

ReactOS x86-32 syscall fuzzer.

System Requirements

ReactOS x86-32;
Account with administrative privileges (optional).

Usage

ROCALL [-win32k] [-logn | logv ] [-pc Value] [-wt Value] [-sc Value] [-s]

-logn - enable logging via COM1 port, service name will be logged, default disabled;
-logv - enable logging via COM1 port, service name and call parameters will be logged(slow), default disabled;
-win32k - launch win32k service table fuzzing, default ntoskrnl service table fuzzing;
-pc Value - number of passes for each service, default value 1024;
-wt Value - wait timeout in seconds, default value 30;
-sc Value - start fuzzing from service entry number (index from 0), default 0;
-s - restart program under LocalSystem account.

When used without parameters RoCall will start fuzzing system service table.

Example:

ROCALL
ROCALL -logn
ROCALL -logv
ROCALL -logn -pc 1234
ROCALL -logv -pc 1234
ROCALL -logn -pc 1234 -sc 100
ROCALL -logv -pc 1234 -sc 100
ROCALL -win32k
ROCALL -win32k -logn
ROCALL -win32k -logv
ROCALL -win32k -logn -pc 1234
ROCALL -win32k -logv -pc 1234
ROCALL -win32k -logn -pc 1234 -sc 100
ROCALL -win32k -logv -pc 1234 -sc 100
ROCALL -wt 40
ROCALL -s

Note: make sure to configure virtual machine COM1 port settings before trying this tool.

How it work

It brute-force through system services and call them multiple times with input parameters randomly taken from predefined "bad arguments" list.

Configuration

By using blacklist.ini configuration file you can blacklist certain services. To do this - add service name (case sensitive) to the corresponding section of the blacklist.ini, e.g. if you want to blacklist services from KiServiceTable then use [ntos] section.

Example of blacklist.ini (default config shipped with program)

[ntos]
NtClose
NtShutdownSystem
NtSuspendProcess
NtSuspendThread
NtTerminateProcess
NtTerminateThread

[win32k]
NtUserSwitchDesktop
NtUserLockWorkStation

Warning

This program may crash the operation system, affect it stability, which may result in data lost or program crash itself. You use it at your own risk.

Build

ROCALL comes with full source code written in C with tiny assembler usage. In order to build from source you need Microsoft Visual Studio 2015 and later versions.

Instructions

Select Platform ToolSet first for project in solution you want to build (Project->Properties->General):
- v120 for Visual Studio 2013;
- v140 for Visual Studio 2015;
- v141 for Visual Studio 2017;
- v142 for Visual Studio 2019.
For v140 and above set Target Platform Version (Project->Properties->General):
- If v140 then select 8.1;
- If v141/v142 then select 10.
Minimum required Windows SDK version is 8.1.

Bugs found with ROCALL

Making ReactOS Great Again, https://www.kernelmode.info/forum/viewtopic6f46.html?f=11&t=5302 (Long list and explanation)
Is ReactOS Great Again (2019), https://swapcontext.blogspot.com/2019/12/is-reactos-great-again-2019.html

hfiref0x/ROCALL