Hi,

Some clever folks on #rust have pointed out that there is a (somewhat) exploitable security flaw in the way bors consumes r+ comments. Specifically, github permits a repository owner, in some circumstances (which we can't quite figure out) to _edit comments of other people_ on commits in their repository.

This means that the following attack scenario would work:


  DrEvil: Files a PR
  Reviewer: Comments "this is awful!" on PR head-commit
  DrEvil: Edits comment to "r+ p=100" and lands change

So, to work around this I'll probably teach bors to require review comments in a different fashion, such as "r+ <sha1>" on the PR itself, or similar. In the meantime, reviewers beware: anything you say on the head-commit of a PR can be rewritten by the submitter into an r+, so assume that "commenting _at all_ implies approval".

-Graydon
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