cat /dev/hdb > /dev/null DoS

From: Karel Kulhavý (clock_at_twibright.com)
Date: 04/08/04

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    Date:	Thu, 8 Apr 2004 08:55:18 +0000
To: linux-kernel@vger.kernel.org

    Hello

    I have 2.8 GHz Pentium IV with 1GB RAM and 250GB ATA-133 IDE disk
    on /dev/hdb.

    I did cat /dev/hdb > /dev/null and after a while (5 minutes),
    the system went totally unresponsive:

    1) man top takes 3 minutes to display man page
    2) Switching between console and X takes also a couple of minutes
    3) top shows this:

    Cpu(s): 1.4% us, 1.4% sy, 0.0% ni, 0.0% id, 0.0% wa, 97.3% hi, 0.0% si

    /dev/hdb is auxilliary disk that is not used, is not mounted and the
    root filesystem doesn't reside on it (of course). Kernel version is 2.6.3.

    Is this behaviour normal?

    Cl<
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