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    SubjectRe: [RCF] [PATCH] unprivileged mount/umount
    > So if a user creates a private namespace, it should have the choice of:
    > 1) Giving up all suid rights (i.e. all mounts are cloned and
    > propagated with nosuid)
    > 2) Not giving up suid for cloned and propagated mounts, but having
    > extra limitations (suid/sgid programs cannot access unprivileged
    > "synthetic" mounts)

    (2) isn't realistic. There's no such thing as a suid program. Suid is a
    characteristic of a _file_. There's no way to know whether a given
    executing program is running with privileges that came from a suid file
    getting exec'ed. Bear in mind that that exec could be pretty remote --
    done by a now-dead ancestor with three more execs in between.

    Many user space programs contain hacks to try to discern this information,
    and they often cause me headaches and I have to fix them. The usual hacks
    are euid==uid, euid==suid, and/or euid==0. It would be an order of
    magnitude worse for the kernel to contain such a hack.

    Bryan Henderson IBM Almaden Research Center
    San Jose CA Filesystems
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