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    From
    SubjectRe: Linux 2.2.18pre21
    Date
    Followup to:  <20001117003000.B2918@wire.cadcamlab.org>
    By author: Peter Samuelson <peter@cadcamlab.org>
    In newsgroup: linux.dev.kernel
    >
    >
    > [jesse]
    > > 1. Your server closes all open directory file descriptors and chroots.
    > > 2. Someone manages to run some exploit code in your process space which--
    >
    > mkdir("foo")
    > chroot("foo")

    BUG: you *MUST* chdir() into the chroot jail before it does you any
    good at all!

    I usually recommend:

    mkdir("foo");
    chdir("foo");
    chroot(".");

    > Bottom line: once you are in the chroot jail, you must drop root
    > privileges, or you defeat the purpose. Security-conscious coders know
    > this; it's not Linux-specific behavior or anything.

    Indeed. They also know the above.

    -hpa
    --
    <hpa@transmeta.com> at work, <hpa@zytor.com> in private!
    "Unix gives you enough rope to shoot yourself in the foot."
    http://www.zytor.com/~hpa/puzzle.txt
    -
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