Restrict macOS runtime to trusted CI runs - #251
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Prevent pull requests from executing repository-controlled commands on the persistent self-hosted runner. Limit the runtime job and fixture cache restore/save steps to pushes and manual dispatches targeting main, so PR content cannot run in or write to the persistent runner.
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Prevent trusted main runs from consuming fixture state left behind by historical pull-request jobs on the persistent runner. Keep generated test credentials out of caches that pull-request workflows can read. Remove obsolete pull-request permissions and supersession handling from the runtime job now that its event policy excludes those runs.
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Thank you for identifying this CI security risk. PRs from new contributors currently require maintainer approval before CI can run, so there is no |
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Summary
The
runtime-macosjob runs on a persistent self-hosted macOS runner andpreviously accepted
pull_requestevents. That allowed PR-controlledMakefile and test scripts to execute on the persistent host and influence the
shared fixture cache.
This change:
runtime-macosto pushes targetingmainandworkflow_dispatchruns targetingmain;The fixture cache remains unchanged for trusted runs. Fixture lockfiles,
download validation, and SSH-key handling are intentionally out of scope.
Validation
git diff --check origin/main..HEAD.github/workflows/main.ymlCloses #250
Summary by cubic
Restricts the self-hosted macOS runtime to trusted runs on
mainand hardens test fixture caching. PR code can’t run on the persistent runner or read/write the fixtures cache; generated credentials are stripped before caching.runtime-macosruns only onpush/workflow_dispatchtorefs/heads/main; removes PR-only permissions/guards and sets non-cancelling concurrency for main.actions/cache; fixtures are freshly prepared, credentials removed, and cache keys include fixture versions to avoid legacy/local state.Written for commit 5406021. Summary will update on new commits.