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    SubjectRe: [PATCH -mm 5/7] add user namespace
    On Thu, 2006-07-13 at 13:02 -0600, Eric W. Biederman wrote:
    > All comparisons of a user equality need to be of the tuple (user namespace, user id).
    > Any comparison that does not do that is an optimization.
    > So my impression was that Cedric's patchset was overoptimized because
    > it did not change most of the uid comparisons, to (user namespace, user id).

    I might just be tempted to call them bugs so people understand what I'm
    talking about ;)

    > Because you can have access to files created in another user namespace it
    > is very unlikely that optimization will apply very frequently. The easy scenario
    > to get access to a file descriptor from another context is to consider unix
    > domain sockets.

    OK, so you're saying that the lack of checks will cause problems rarely,
    and that passing a fd across a unix domain sockets is one of the times
    when you _could_ encounter this problem?

    -- Dave

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