Configuration

Target Configuration (fuzzbuzz.yaml)
Every repository needs a fuzzbuzz.yaml, which tells Fuzzbuzz how to set up and configure your fuzz targets.
The following sections describe each field allowed in a fuzzbuzz.yaml configuration file and how to use them.
base
Type: string
Required: yes
Valid values: ubuntu:16.04
The name of the operating system to use as the base of the Docker image the target is set up and fuzzed in. As of now, ubuntu:16.04 is the only option.
Usage:
fuzzbuzz.yaml
base: ubuntu:16.04
environment
Type: Array
Required: no
Environment variables that will be accessible to each target.
Usage:
fuzzbuzz.yaml
environment:
    - ENV_VAR=value
    - ENV_VAR2=value2
setup
Type: Array
Required: no
A list of commands to run prior to each target's specific setup commands.
Usage:
fuzzbuzz.yaml
setup:
    - sudo apt-get update
    - sudo apt-get install my-dependency
language
Type: string
Required: yes
Valid values: c, c++, go
The name of the language the target was written in. This must be specified either here, or in target.language. If it is specified in both, the value in target.language overrides the one here.
Usage:
fuzzbuzz.yaml
language: c++
version
Type: string
Required: yes (all languages except C/C++)
The version of the target's language to use. This must be specified either here, or in target.version. If it is specified in both, the value in target.version overrides the one here.
Usage:
fuzzbuzz.yaml
language: go
version: "1.11"
checkout
Type: string
Required: yes (Golang only)
Specifies where in the Gopath to place your code. This must be specified either here, or in target.harness.checkout. If it is specified in both, the value in target.harness.checkout overrides the one here.
Usage:
fuzzbuzz.yaml
# checkout specifies where to check your code out
# this repository will be placed in the directory:
# ~/go/src/github.com/x/y/
checkout: github.com/x/y
targets
Type: Array
Required: yes
An array of target configurations.
Usage:
fuzzbuzz.yaml
targets:
    - name: target-name
    # --- Other target configuration options omitted
target.name
Type: string
Required: yes
The name of the target. Must be unique within the fuzzbuzz.yaml. Can only contain letters, numbers, dashes and underscores.
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
target.language
Type: string
Required: yes
Valid values: c, c++, go
The name of the language the target was written in.
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
      language: c
target.version
Type: string
Required: yes (all languages except C/C++)
The version of the target's language to use.
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
      language: go
      version: "1.11"
target.environment
Type: Array
Required: no
Environment variables that will be accessible to this specific target.
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
      environment:
        - ENV_VAR=value
        - ENV_VAR2=value2
target.setup
Type: Array
Required: no
A list of commands to run that set up or compile the target.
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
      setup:
        - sudo apt-get install my-lib
        - CC=$FUZZ_CC CXX=$FUZZ_CXX make my-target
target.corpus
Type: string
Required: yes
The location of the target's test corpus. This should point to a directory of files, each of which should be a separate test case that can be fed to the target and runs a test that passes. The directory can be left empty, but this will result in a more inefficient start to fuzzing.
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
      corpus: ./my-target/corpus
target.harness
Type: Map
Required: yes
Configuration that tells Fuzzbuzz how to find & run the target. Configuration differs depending on the language
C
C++
Golang
Binaries
C
Harness specifies the location of the final compiled binary.
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
      harness:
        binary: ./target
C++
Harness specifies the location of the final compiled binary.
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
      harness:
        binary: ./target
Golang
Harness specifies the method to fuzz, the package it resides in, and any build tags to use when compiling.
Usage:
targets:
    - name: my-target
      harness:
        # the name of your method
        function: FuzzMe
        # build tags are optional
        build_tags: tag1 tag2 tag3
        # package specifies the package to import the
        # desired function from 
        package: github.com/x/y/z/a/b/c
        # checkout specifies where to check your code out
        # this repository will be placed in the directory:
        # ~/go/src/github.com/x/y/
        checkout: github.com/x/y
Binaries
Harness specifies the location of the final compiled binary, as well as how the binary receives input.
If the binary takes input from a file, mark the location in the binary's command line where the input file should be placed with a @@. This will be replaced automatically when fuzzing.
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
      harness:
        binary: ./target @@
        input: file # either stdin, socket or file
The socket input mode is coming soon, and is not currently available on the platform.
target.memory_limit
Type: integer
Required: no
The maximum memory usage in megabytes to allow when processing a test case. Any tests that use more memory than this will be reported as bugs.
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
      memory_limit: 1000 # 1 GB
target.timeout
Type: integer
Required: no
The maximum amount of time in milliseconds the target should take to process any one test case.
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
      timeout: 500 # 500 milliseconds
target.sanitizers
This field is only valid for targets written in or compiled from C and C++.
Type: Map
Required: no
Valid values: address
Sanitizers to use with this target. Sanitizers are analyzers that are compiled along with the target, and alert on specific issues.
Supported sanitizers:
​Address Sanitizer: finds bugs including Use After Free, Buffer Over/Underflows, Use After Returns, Memory Leaks, etc
Fuzzbuzz sets the following defaults for ASAN_OPTIONS (these will override your settings): abort_on_error=1:print_scariness=1
symbolize=0 is set during runtime, and symbolize=1 is set when reproducing crashes to gather stacktraces
Usage:
fuzzbuzz.yaml
targets:
    - name: my-target
      sanitizers:
        # sanitizer options can be specified as a string
        address: detect_stack_use_after_return=1:debug=1
        # the field can also be left blank, e.g.:
        address:
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Last updated 7 months ago