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Re^3: 5.18.0 is available NOW!

by Hugmeir (Sexton)
on May 19, 2013 at 13:12 UTC ( #1034215=note: print w/ replies, xml ) Need Help??

Comment on Re^3: 5.18.0 is available NOW!
Re^4: 5.18.0 is available NOW!
by BrowserUk (Pope) on May 19, 2013 at 14:24 UTC

    That is not the problem; the response to that is.

    When considering a breaking change, I was taught to ask three questions:

    1. Is the breakage actually necessary?

      Is the thing being 'fixed' actually manifesting itself in production code.

      Has any real-world occurrence of the ACA actually been witnessed or reported?

    2. If so, can the breakage be limited in scope?

      Either by limiting the total breakage; or by selectively applying the breaking fix only when required.

      Could the 'fix' have been limited to (say) only when taint was enabled?

    3. Is the breaking 'fix' the *ONLY* solution to the problem?

      Not the first. Not the best. Not the least effort or least worst; but the ONLY?

      Is it necessary to randomise all hashes differently?

      Wouldn't picking the same random hash initialisation, for all hashes for any given run, have been just as effective at stopping real-world exploits in the wild?

      Check the documentation on PERL_PERTURB_KEYS in perldelta: PERL_PERTURB_KEYS=0 will restore the previous behavior. This should help you to find bugs related to hash randomization.
      1. Yes. Yes. Yes
      2. No. No. No.
      3. Only is irrelevant. Only is irrelevant. Yes. No.

        Wrong on every count. And posting anonymously proves it.


        With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
        Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
        "Science is about questioning the status quo. Questioning authority".
        In the absence of evidence, opinion is indistinguishable from prejudice.

        Where is the proof of concept code? (Without it, this is nothing more that idle speculation that has cost a lot of people a lot of time and effort.)


        With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
        Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
        "Science is about questioning the status quo. Questioning authority".
        In the absence of evidence, opinion is indistinguishable from prejudice.

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