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    SubjectRe: [PATCH 0/2] file capabilities: two bugfixes
    Seth Arnold wrote:
    > On Fri, Dec 08, 2006 at 01:36:57PM -0600, Serge E. Hallyn wrote:
    >> The other is that root can lose capabilities by executing files with
    >> only some capabilities set. The next two patches change these
    >> behaviors.
    > I saw this in my code review and thought that this behaviour was
    > intentional. :) It seemed like a good idea to me..
    It really depends on which threat you are trying to defend against.

    Serge is correct that it does not prevent root from copying the file,
    messing with the attributes, and running it anyway. However, I don't see
    file capabilities as being intended to try to confine root.

    Rather, it seems like it is intended to make it easier to manage what
    capabilities should usually be present when the program is run. E.g. the
    file has a limited capability set so that root can run it and not have
    to think about overtly dropping privs or su'ing to a non-privileged user
    to be able to run it safely.

    So I'm with Seth; it sounds like a feature, not a bug.

    Caveat: I have no clue what the POSIX.1e committee intended. But since
    none of the POSIX-alike implementations are compatible with each other
    anyway, I don't really care :)


    Crispin Cowan, Ph.D.
    Director of Software Engineering, Novell
    Hacking is exploiting the gap between "intent" and "implementation"

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