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chore(ci): fuzz Jazzer targets on relevant merges, tighten fuzzZipRead, add zip seeds - #416
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📝 WalkthroughWalkthroughThe ZIP-reading fuzz target now allows ChangesFuzzing input handling
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Other Suggested reviewers: Merge Risk: 🔵 Low · up to The fuzz workflow will not run nightly as described, and the checkout credential stays available to Maven build code. Neither change affects production behavior, but both should be fixed before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Review comments at @.github/workflows/fuzz.yaml:
- Around line 8-16: Add a schedule trigger to the workflow alongside push and
workflow_dispatch, using a cron expression that runs nightly at 07:17 UTC.
- Line 37: Set persist-credentials to false on the actions/checkout step in the
fuzz workflow; this job runs Maven and does not need checkout credentials
afterward.
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…d, add zip seeds Add a workflow that runs each @fuzztest in Fuzzing for its full maxDuration, one matrix job per target, since Jazzer fuzzes one target per run. It does not run on pull requests: fuzzing takes ten minutes per target, which is too slow for the payoff on every change. It runs on pushes to main that touch sdk/src, a pom.xml, or the workflow itself, so merges that cannot change the fuzzed code do not spend runner time. A concurrency group coalesces bursts of merges into a single queued run of the latest commit. It can also be started by hand. The corpus Jazzer generates is cached per target and saved even when the run fails, so each run continues from the last. When a target finds something, the reproducing crash-* input and the surefire reports are uploaded as an artifact. fuzzZipRead swallowed IllegalArgumentException along with the expected InvalidZipException, so a reader that seeks to a corrupt offset instead of rejecting the archive passed silently. Only InvalidZipException, IOException, and JsonParseException (from parsing the .json entries) are now expected; anything else fails the fuzz target. Add seed archives covering structures the existing corpus does not reach: zip64 end of central directory records (full, entry-count-only, with trailing data, with a decoy signature in the comment), UTF-8 entry names, an empty archive, and a commons-compress Zip64Mode.Always archive. Ignore the .cifuzz-corpus directory that Jazzer writes during fuzzing runs. Refs: DSPX-5070 Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
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Related: DSPX-4589 (zip reader hardening, #398), DSPX-5070 (fuzzing in CI; this PR adds the CI job, and the PR replay and alerting are still to do there), DSPX-5073 (the
fuzzTDFNPE)Runs the Jazzer fuzz targets after merges to
mainthat touch the fuzzed code. Also tightens thefuzzZipReadtarget and gives it seeds for zip structures the existing corpus never reaches. No SDK code changes.Fuzzing in CI (
.github/workflows/fuzz.yaml)mainthat touchsdk/src/**, anypom.xml, or the workflow itself, plusworkflow_dispatch. Merges that can't change the fuzzed code, such as docs,cmdline, or examples, don't spend runner time. Aconcurrencygroup means a burst of merges queues a single run of the latest commit, and a run that's already fuzzing isn't cancelled. Not on pull requests: a real fuzz run takes the full 10-minutemaxDurationper target, which is too slow for the payoff on every change.@FuzzTest(fuzzZipRead,fuzzTDF), because Jazzer fuzzes one target per run.fail-fast: falsekeeps one target's result from cancelling the other.sdk/.cifuzz-corpus) is cached per target. It is saved even when a run fails, so each run continues from the last.crash-*input plus the surefire reports are uploaded asfuzz-findings-<target>. Fix the bug, then commit the input underFuzzingInputs/<target>/so that it replays.checks.yaml(buf auth,sdk-fips-bcinstalled for the default non-fips profile), with the same pinned actions.upload-artifactis newly pinned to v4.6.2.I ran the job's Maven commands locally. On a finding, the job fails and Jazzer writes the
crash-*file where the upload glob looks for it. The corpus lands at the cached path.fuzzTDFwill be red until the existingNullPointerException(DSPX-5073, see Caveats) is fixed. Jazzer replays the checked-in inputs before it starts fuzzing, and one of them already hits it.Zip fuzz target
fuzzZipReadno longer swallowsIllegalArgumentException. The harness used to catch it along withInvalidZipException, so a reader that seeks to a corrupt offset instead of rejecting the archive passed silently. It now expects only:InvalidZipException;IOException;JsonParseException, which comes from parsing the.jsonentries, not from the zip itself.Anything else fails the target.
Seven seed archives in
FuzzingInputs/fuzzZipRead/:seed-zip64: zip64 end of central directory record and locator;seed-zip64-entry-count-only: zip64 record where only the entry count needs it;seed-zip64-trailing-data: zip64 archive followed by trailing bytes;seed-zip64-comment-with-decoy-signature: a strayPK\5\6inside the comment;seed-plain-utf8-names: non-ASCII entry names with general purpose bit 11 set;seed-empty: a bare end of central directory record;seed-commons-zip64-always: written by commons-compress withZip64Mode.Always..cifuzz-corpus/is ignored. Jazzer writes its generated corpus there during fuzzing runs.Results
On
main(#415) with this change:JAZZER_FUZZ=1 mvn -pl sdk -am test -Dtest='Fuzzing#fuzzZipRead'ran for 10 minutes, about 426k executions, with no findings.mvn -pl sdk -am test -Dtest='Fuzzing#fuzzZipRead'passed 11/11 (the existing inputs plus the new seeds). It also passed 122/122 with the roughly 110 inputs generated by a 10-minute run against fix(sdk): DSPX-4589 zip64 EOCD sentinels, truncated archive detection, and UTF-8 entry names #398's reader added.With #398's reader, a 10-minute run (about 130k executions) also found nothing. Main is still exposed to the bugs #398 fixes, but they don't show up as exceptions, so this harness can't see them:
#398's unit tests cover those.
Caveats
Fuzzing. Surefire only picks up classes named like*Test, and the pom doesn't add an include. So outside the fuzz workflow, these seeds and the existingcrash-*inputs replay only when you run-Dtest=Fuzzingyourself. OncefuzzTDFis fixed, a cheap follow-up would replay the corpus on PRs, which takes about 3 seconds. It would need either renaming the class toFuzzingTestor adding a Surefire include.fuzzTDFcorpus fails onmain. Running-Dtest='Fuzzing#fuzzTDF'onmainhits aNullPointerExceptionatManifest.readManifest(Manifest.java:673).gson.fromJsonreturnsnullfor a manifest whose JSON isnullor empty, andreadManifestdereferences it before its own null checks. CI hides this for the reason above. It isn't fixed here; DSPX-5073 tracks it. Until it is fixed, thefuzzTDFjob fails, and because the workflow runs on push, that shows as a red check on themaincommits that trigger it.Summary by CodeRabbit