Ferret: A fuzzer for the ciaoengine binary

The Ciao programming language has a virtual machine under the hood that is made in C. This fuzzer mutates a seed with radamsa and sends the samples as Ciao bytecode.

Requirements

This fuzzer requires a working instalation of Ciao prolog and it's recommended to have one with some kind of instrumentation for detecting subtle bugs.

As an example this is how to build Ciao with clang and AddressSanitizer on:

./ciao-boot.sh configure \
	--core:custom-cc=clang \
	--core:extra-cflags="-fsanitize=address" \
	--core:extra-ldflags="-fsanitize=address"
./ciao-boot.sh build

For the mutation of the samples the fuzzer uses radamsa. For instalation instructions of radamsa check it's repo.

Usage

By default the fuzzer will use camel.pl as a seed file. This seed will usually crash the program and not even fuzz. To invoke the fuzzer run the fuzzer.sh script.

./fuzzer.sh # For fuzzing using camel.pl as seed
./fuzzer.sh <seed file> # For fuzzing with another file as seed
CIAOROOT=... ./fuzzer.sh # To change the directory where the fuzzer searchs for ciaoc.

To make a more intelligent fuzzing, either provide your own seed with the bytecode you want to test or use the gen-hw-example.sh script to generate the bytecode of a simple hello world program in Ciao Prolog.