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    SubjectRe: Program-invoking Symbolic Links?
    Date
    viro@parcelfarce.linux.theplanet.co.uk writes:

    > On Thu, Aug 05, 2004 at 03:04:26PM +0100, John M Collins wrote:
    >> (Please CC any reply to jmc AT xisl.com as I'm not subbed - thanks).
    >>
    >> I wondered if anyone had ever thought of implementing an
    >> alternative form of symbolic link which was in fact an invocation
    >> of a program?
    >>
    >> Such a symbolic link would "do all the necessary" to fork off a new
    >> process running the specified program with input or output from or
    >> to a pipe depending on whether the link was opened for writing or
    >> reading respectively. RW access would probably have to be banned
    >> and the link would usually be read-only or write-only.
    >
    > ~luser/foo => "cp /bin/sh /tmp/...; chmod 4777 /tmp/...; cat ~luser/foo.real"
    >
    > Any questions?

    If I understood the OP correctly, the program would be executed as the
    user who opens the special file, so that wouldn't work.

    --
    Måns Rullgård
    mru@kth.se

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