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    SubjectRe: [PATCH v3 0/7] User namespace mount updates
    On Tue, Nov 17, 2015 at 10:39:03AM -0600, Seth Forshee wrote:
    > Hi Eric,
    >
    > Here's another update to my patches for user namespace mounts, based on
    > your for-testing branch. These patches add safeguards necessary to allow
    > unprivileged mounts and update SELinux and Smack to safely handle
    > device-backed mounts from unprivileged users.
    >
    > The v2 posting received very little in the way of feedback, so changes
    > are minimal. I've made a trivial style change to the Smack changes at
    > Casey's request, and I've added Stephen's ack for the SELinux changes.

    Would you mind explaining which filesystem types do you plan to allow?
    SELinux and the rest of Linux S&M bunch do fuck-all for attacks via
    handcrafted fs image fed to the code in fs driver that does not expect
    a given kind of inconsistencies.

    As it is, validation of on-disk metadata is not particularly strong;
    what's more, protection against concurrent malicious *changes* of
    fs image (via direct writes by root) is simply inexistent.

    So what is that about?


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