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117 lines
5.6 KiB
Plaintext
117 lines
5.6 KiB
Plaintext
HACKING ON SYSTEMD
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We welcome all contributions to systemd. If you notice a bug or a missing
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feature, please feel invited to fix it, and submit your work as a github Pull
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Request (PR):
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https://github.com/systemd/systemd/pull/new
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Please make sure to follow our Coding Style when submitting patches. See
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CODING_STYLE for details. Also have a look at our Contribution Guidelines:
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https://github.com/systemd/systemd/blob/master/.github/CONTRIBUTING.md
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When adding new functionality, tests should be added. For shared functionality
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(in src/basic and src/shared) unit tests should be sufficient. The general
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policy is to keep tests in matching files underneath src/test,
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e.g. src/test/test-path-util.c contains tests for any functions in
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src/basic/path-util.c. If adding a new source file, consider adding a matching
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test executable. For features at a higher level, tests in src/test/ are very
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strongly recommended. If that is no possible, integration tests in test/ are
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encouraged.
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Please always test your work before submitting a PR. For many of the components
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of systemd testing is straight-forward as you can simply compile systemd and
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run the relevant tool from the build directory.
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For some components (most importantly, systemd/PID1 itself) this is not
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possible, however. In order to simplify testing for cases like this we provide
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a set of "mkosi" build files directly in the source tree. "mkosi" is a tool for
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building clean OS images from an upstream distribution in combination with a
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fresh build of the project in the local working directory. To make use of this,
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please acquire "mkosi" from https://github.com/systemd/mkosi first, unless your
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distribution has packaged it already and you can get it from there. After the
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tool is installed it is sufficient to type "mkosi" in the systemd project
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directory to generate a disk image "image.raw" you can boot either in
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systemd-nspawn or in an UEFI-capable VM:
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# systemd-nspawn -bi image.raw
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or:
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# qemu-system-x86_64 -enable-kvm -m 512 -smp 2 -bios /usr/share/edk2/ovmf/OVMF_CODE.fd -hda image.raw
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Every time you rerun the "mkosi" command a fresh image is built, incorporating
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all current changes you made to the project tree.
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Alternatively, you may install the systemd version from your git check-out
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directly on top of your host system's directory tree. This mostly works fine,
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but of course you should know what you are doing as you might make your system
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unbootable in case of a bug in your changes. Also, you might step into your
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package manager's territory with this. Be careful!
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And never forget: most distributions provide very simple and convenient ways to
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install all development packages necessary to build systemd. For example, on
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Fedora the following command line should be sufficient to install all of
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systemd's build dependencies:
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# dnf builddep systemd
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Putting this all together, here's a series of commands for preparing a patch
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for systemd (this example is for Fedora):
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$ sudo dnf builddep systemd # install build dependencies
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$ sudo dnf install mkosi # install tool to quickly build images
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$ git clone https://github.com/systemd/systemd.git
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$ cd systemd
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$ vim src/core/main.c # or wherever you'd like to make your changes
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$ meson build # configure the build
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$ ninja -C build # build it locally, see if everything compiles fine
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$ ninja -C build test # run some simple regression tests
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$ sudo mkosi # build a test image
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$ sudo systemd-nspawn -bi image.raw # boot up the test image
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$ git add -p # interactively put together your patch
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$ git commit # commit it
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$ git push REMOTE HEAD:refs/heads/BRANCH
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# where REMOTE is your "fork" on github
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# and BRANCH is a branch name.
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And after that, head over to your repo on github and click "Compare & pull request"
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Happy hacking!
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FUZZERS
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systemd includes fuzzers in src/fuzz that use libFuzzer and are automatically
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run by OSS-Fuzz (https://github.com/google/oss-fuzz) with sanitizers. To add a
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fuzz target, create a new src/fuzz/fuzz-foo.c file with a LLVMFuzzerTestOneInput
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function and add it to the list in src/fuzz/meson.build.
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Whenever possible, a seed corpus and a dictionary should also be added with new
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fuzz targets. The dictionary should be named src/fuzz/fuzz-foo.dict and the seed
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corpus should be built and exported as $OUT/fuzz-foo_seed_corpus.zip in
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scripts/oss-fuzz.sh.
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The fuzzers can be built locally if you have libFuzzer installed by running
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scripts/oss-fuzz.sh. You should also confirm that the fuzzer runs in the
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OSS-Fuzz environment by checking out the OSS-Fuzz repo, and then running
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commands like this:
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python infra/helper.py build_image systemd
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python infra/helper.py build_fuzzers --sanitizer memory systemd ../systemd
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python infra/helper.py run_fuzzer systemd fuzz-foo
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If you find a bug that impacts the security of systemd, please follow the
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guidance in .github/CONTRIBUTING.md on how to report a security vulnerability.
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For more details on building fuzzers and integrating with OSS-Fuzz, visit:
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https://github.com/google/oss-fuzz/blob/master/docs/new_project_guide.md
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https://llvm.org/docs/LibFuzzer.html
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https://github.com/google/fuzzer-test-suite/blob/master/tutorial/libFuzzerTutorial.md
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https://chromium.googlesource.com/chromium/src/testing/libfuzzer/+/HEAD/efficient_fuzzer.md
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