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    SubjectRe: linux-kernel-digest V1 #922
    On Fri, 30 May 1997, Daniel G. Linder wrote:

    > >From: "Richard B. Johnson" <root@analogic.com>
    > >Date: Thu, 29 May 1997 20:15:59 -0400 (EDT)
    > >Subject: 2.1.41 <not SMP>
    > >
    > >A kernel crash, "Unable to handle NULL Pointer dereference at 000000"...
    > >will be caused by::
    > >
    > ># od -x /dev/kmem
    > >
    > >I used to be able to __READ__ page zero. I think you can't do that anymore.
    > >If so, /dev/kmem should not access the restricted page. Users can crash
    > >the machine with simple commands.
    > >
    > >Cheers,
    > > Dick
    >
    > Not a big point, but your command shows a "#" implying root did this.
    > Can a normal user cause a crash, also?
    > I'm going to try this on my 2.1.40 box after sending this letter.
    >
    > Dan

    Depends upon the "file" protection. Normally no, don't want users looking
    for passwords, etc.


    Cheers,
    DJ
    -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
    Richard B. Johnson
    Analogic Corporation
    Email : rjohnson@analogic.com, johnson@analogic.com
    Penguin : Linux version 2.1.41 on an i586 machine (66.15 BogoMips).
    Warning : It's hard to stay on the trailing edge of technology.
    -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-


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