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go-fuzz-action

GitHub Action for Go fuzz testing. This Action runs Go's built-in fuzz testing, added in Go 1.18, on your code.

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Inputs

• fuzz-time [REQUIRED]: Fuzz target iteration duration, specified as a time.Duration (for example 1h30s). Corresponds to -fuzztime flag for the go test command. Ensure this is less than your job/workflow timeout.
• packages [optional]: Run fuzz test on these packages. Corresponds to the [packages] input for the go test command.
  • Default: .
• fuzz-regexp [optional]: Run the fuzz test matching the regular expression. Corresponds to the -fuzz flag for the go test command.
  • Default: Fuzz
• fuzz-minimize-time [optional]: Fuzz minimization duration, specified as a time.Duration (for example 1h30s). Corresponds to -fuzzminimizetime flag for the go test command. If you provide this input, ensure it is less than your job timeout.
  • Default: 10s
• go-version [optional]: Which version of Go to use for fuzzing. This will be passed on to actions/setup-go@v3.
  • Default: 1.18

Returns:

• SUCCESS: if your fuzz tests don't raise a failure within the fuzz-time input constraint.
• FAILURE: if your fuzz tests raise a failure within the fuzz-time input constraint.
  • The workflow run logs will include instructions on how to download (using the GitHub CLI) the failing seed corpus to your local machine for remediation, regardless of run trigger.
  • If you run this Action in a PR workflow, it'll comment these instructions on your PR: <img width="864" alt="image" src="https://user-images.githubusercontent.com/12765385/162630131-9050221e-dc75-4620-aa19-d004d8678074.png">

Usage

⚠️This Action is not tested on windows GitHub Actions runners! Use with windows runner OS at your own risk!

Create a .github/workflows/go-fuzz-test.yml in your repository containing:

name: Go fuzz test
on:
  push:
  pull_request:
jobs:
  fuzz-test:
    name: Fuzz test
    runs-on: ubuntu-latest
    steps:
      - uses: jidicula/go-fuzz-action@v1.1.0
        with:
          fuzz-time: 30s

Fuzz test all packages in repo

If you have multiple packages in your repo and you want to fuzz test them all, create a .github/workflows/go-fuzz-test.yml in your repository containing:

name: Go fuzz test
on:
  push:
  pull_request:
jobs:
  fuzz-test:
    name: Fuzz test
    runs-on: ubuntu-latest
    steps:
      - uses: jidicula/go-fuzz-action@v1.1.0
        with:
          packages: './...'
          fuzz-time: 30s

Longer minimize time

If you want the fuzz test to spend more time on minimizing the failing input to the smallest possible and most human readable value which will still produce an error, create a .github/workflows/go-fuzz-test.yml in your repository containing:

name: Go fuzz test
on:
  push:
  pull_request:
jobs:
  fuzz-test:
    name: Fuzz test
    runs-on: ubuntu-latest
    steps:
      - uses: jidicula/go-fuzz-action@v1.1.0
        with:
          packages: './...'
          fuzz-time: 30s
          fuzz-minimize-time: 1m

Fuzz tests with different regexp

If you have fuzz tests that don't begin with Fuzz (the default regexp), create a .github/workflows/go-fuzz-test.yml in your repository containing:

name: Go fuzz test
on:
  push:
  pull_request:
jobs:
  fuzz-test:
    name: Fuzz test
    runs-on: ubuntu-latest
    steps:
      - uses: jidicula/go-fuzz-action@main
        with:
          packages: './...'
          fuzz-time: 30s
          fuzz-minimize-time: 1m
          fuzz-regexp: OtherFuzzRegexp

Example repo

I haven't figured out how to test this adequately within this repo, so you can verify its behaviour here: https://github.com/jidicula/test-go-fuzz-action/pull/2

Who uses this?

These public repos use this Action.