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    SubjectRe: ANNOUNCE: /dev/bios - flash rom bios driver
    What does it change? How an additional dev
    adds more protection, and from what?

    Ark

    John Labovitz wrote:
    >
    > Chip Salzenberg said:
    >
    > > According to Dr. Werner Fink:
    > > > What's about mistakes? This interface is very easy and
    > > > therefore it _is_ very dangerous, isn't it?
    > >
    > > I agree. Perhaps the device should require that writing take place
    > > at an offset greater than zero ("dd oskip=1k"?), [...]
    >
    > i'm just a kernel neophyte here, but since we're talking about hacks
    > (;-)...
    >
    > how about a sort of side-device that's used as a guard? this reminds
    > me of the big paper-cutter machine i used in high school print shop --
    > one had to press the left-button with the left hand and the
    > right-button with the right hand, or the blade wouldn't come down. so
    > there could be a /dev/bios and /dev/biosguard, the latter of which has
    > to be open (for writing, of course) in order for a dangerous write to
    > the former. like this:
    >
    > fd1 = open("/dev/biosguard", O_WRONLY);
    > fd2 = open("/dev/bios", O_WRONLY);
    > write(fd2, newbioscode, newbioscodelen);
    > close(fd2);
    > close(fd1);
    >
    > i'm assuming the bios driver could know which process has opened
    > /dev/bios and make sure that same process has also opened
    > /dev/biosguard.
    >
    > obviously, this could work under /proc, too.
    >
    > john
    >
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