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    SubjectRe: disk-destroyer.c


    > > > Can disk-destroyer be pushed into a shellstack because it is so small?
    > > >
    > > Yes, it's true. It can be made even smaller, much smaller, than the
    > > compiled size of the code. Although the limits on how much shellcode
    > > you can send in a buffer overrun do vary, I expect this will almost
    > > certainly fit in just about every buffer overrun I've seen.

    Here is your SECURITY HOLE!

    JOE-SIX-PACK-HACKER can fry your butt.

    On Fri, 21 Jul 2000, Oliver Xymoron wrote:

    > On Fri, 21 Jul 2000, Andre Hedrick wrote:
    >
    > > On Fri, 21 Jul 2000, Oliver Xymoron wrote:
    > >
    > > > No, of course not, but we also don't want to make large changes to the
    > > > kernel to paper over a hole that we can't cement closed. Especially now.
    > >
    > > Here is you damn steel-plate-of-armor!
    >
    > You're missing the point. If root _wants_ to damage the drive, this patch
    > won't stop him. He merely loads a module that duplicates the old code and
    > away we go. If I mention it on Bugtraq, someone will probably post the
    > source for such a module within a week. Fighting it is futile.
    >
    > This doesn't mean we shouldn't try to prevent people from doing it by
    > accident, it just means the fix should be as simple and non-intrusive to
    > the kernel as possible. If the fix is anything more than:
    >
    > if(NAUGHTY_IDE_COMMAND)
    > {
    > printk("NAUGHTY__IDE_COMMAND attempted\n");
    > return -EBADUSER;
    > }
    >
    > ..then it might not be worth fixing. I'd even be ok with:
    >
    > if(NAUGHTY_IDE_COMMAND) panic(); /* root tried to kill drive */
    >
    > ..as it keeps root from doing anything else bad.
    >
    > --
    > "Love the dolphins," she advised him. "Write by W.A.S.T.E.."
    >
    >

    Andre Hedrick
    The Linux ATA/IDE guy


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