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How to contribute to syzkaller

If you want to contribute to the project, feel free to send a pull request following the guidelines below.

What to work on

Extending/improving system call descriptions is always a good idea.

Unassigned issues from the bug tracker are worth doing, but some of them might be complicated.

To contribute code or syscall descriptions, at the very least you need to be able to build and run syzkaller, see the instructions here.

If you want to work on something non-trivial, please briefly describe it on the [email protected] mailing list first, so that there is agreement on high level approach and no duplication of work between contributors.

Guidelines

In case this is your first pull request to syzkaller, you need to:

Commits

Commit messages should follow the following template:

dir/path: one-line description
<empty line>
Extended multi-line description that includes
the problem you are solving and how it is solved.

dir/path is a relative path to the main dir this commit changes (look at examples in the commit history).

Please pay attention to punctuation. In particular:

  • one-line description should not start with a Capital letter.
  • There is no dot at the end of one-line description.
  • Extended multi-line description is full English sentences with Capital letters and dots.

Also:

  • If you commit fixes an issue, please include Fixes #NNN line into commit message (where NNN is the issue number). This will auto-close the issue. If you need to mention an issue without closing it, add Update #NNN.
  • For syscall descriptions *.const files are checked-in with the *.txt changes in the same commit.

Pull requests

  • Rebase your working branch onto the master branch before sending a pull request to avoid merge conflicts.
  • Run make presubmit and ensure that it passes before sending a PR. It may require some additional packages to be installed (try sudo make install_prerequisites).
  • Provide a brief high-level description in the pull request title. The pull request text is mostly irrelevant, all the details should be in the commit messages.
  • If you're asked to add some fixes to your pull request, please squash the fixes into the old commits.

How to create a pull request on Github

  • First, you need an own git fork of syzkaller repository. Nagivate to github.com/google/syzkaller and press Fork button in the top-right corner of the page. This will create https://github.com/YOUR_GITHUB_USERNAME/syzkaller repository.

  • Checkout main syzkaller repository if you have not already. To work with go command the checkout must be under $GOPATH. The simplest way to do it is to run go get -u -d github.com/google/syzkaller/prog, this will checkout the repository in $GOPATH/src/github.com/google/syzkaller.

  • Remember to export PATH=$GOPATH/bin:$PATH if you have not already.

  • Then add your repository as an additional origin:

    cd $GOPATH/src/github.com/google/syzkaller
git remote add my-origin https://github.com/YOUR_GITHUB_USERNAME/syzkaller.git
git fetch my-origin
git checkout -b my-branch my-origin/master

This adds git origin my-origin with your repository and checks out new branch my-branch based on master branch.

  • Change/add files as necessary.
  • Commit changes locally. For this you need to run git add for all changed files, e.g. git add sys/linux/sys.txt. You can run git status to see what files were changed/created. When all files are added (git status shows no files in Changes not staged for commit section and no relevant files in Untracked files section), run git commit and enter commit description in your editor.
  • Run tests locally (make install_prerequisites followed by make presubmit).
  • Push the commit to your fork on github with git push my-origin my-branch.
  • Nagivate to github.com/google/syzkaller and you should see green Compare & pull request button, press it. Then press Create pull request. Now your pull request should show up on pull requests page.
  • If you don't see Create pull request button for any reason, you can create pull request manually. For that nagivate to pull requests page, press New pull request, then compare across forks and choose google/syzkaller/master as base and YOUR_GITHUB_USERNAME/syzkaller/my-branch as compare and press Create pull request.
  • If you decided to rebase commits in my-branch (e.g. to rebase them onto updated master) after you created a pull-request, you will need to do a force push: git push -f my-origin my-branch.

Using syz-env

Developing syzkaller requires a number of tools installed (Go toolchain, C/C++ cross-compilers, golangci-lint, etc). Installing all of them may be cumbersome, e.g. due broken/missing packages. syz-env provides a working hermetic development environment based on a Docker container. If you don't yet have Docker installed, see documentation, in particular regarding enabling sudo-less Docker (Googlers see go/docker).

It's recommended to create an alias for syz-env script:

alias syz-env="$(go env GOPATH)/src/github.com/google/syzkaller/tools/syz-env"

Then it can be used to wrap almost any make invocation as:

syz-env make format
syz-env make presubmit
syz-env make extract SOURCEDIR=~/linux

Or other commands/scripts, e.g.:

syz-env go test -short ./pkg/csource

Or you may run the shell inside of the container with just syz-env and look around.