ajfabbri commented on code in PR #8450:
URL: https://github.com/apache/hadoop/pull/8450#discussion_r3125573200
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.github/workflows/tmpl_build_and_test.yml:
##########
@@ -86,6 +90,20 @@ jobs:
name: Build Image ${{ inputs.os }}-${{ inputs.branch }}
runs-on: ubuntu-24.04
needs: [ precondition ]
+ # Security: this does not leak write access for our image repository to
+ # forked repos.
+ #
+ # We have `packages: write` permissions for our GITHUB_TOKEN below.
However:
+ #
+ # - For `pull_request`, GitHub downgrades GITHUB_TOKEN permissions to
+ # read-only.
+ # - For `push` triggers on a fork, the GITHUB_TOKEN retains write
+ # permissions, but the `push` is happening in the context of the fork,
not
+ # the upstream repo.
+ # - For `pull_request_target` (risky), the write permission is
+ # overridden by our repository's setting "Send write tokens to workflows
+ # from pull requests" which should be disabled.
+ # See https://issues.apache.org/jira/browse/INFRA-27839 for confirmation.
Review Comment:
I just heard back from INFRA. This feature is only available for private
repositories (I assume it is too dangerous for public repositories). So my
understanding is that any image repository write permissions will be scoped to
the repository they run on (i.e. a fork does not get write access to the base
repo's image repository). I will update this comment now.
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