Re: [RFC] prevent "dd if=/dev/mem" crash

From: Andreas Schwab <>
Date: 2003-10-18 08:40:48
"Luck, Tony" <> writes:

>> I expect there are probably different opinions about the idea
>> that "dd if=/dev/mem" exits without doing anything.  Sparc and
>> 68K have nearby code that bit-buckets writes and returns zeroes
>> for reads of page zero.  We could do that, too, but it seems like
>> kind of a hack, and holes on ia64 can be BIG (on the order of
>> 256GB for one box).
> Filling in the holes does seem like a bad idea, but so does returning
> EOF when you hit a hole (which is what I think your patch is doing).
> Would ENODEV be better?

EIO would probably fit better.


Andreas Schwab, SuSE Labs,
SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 Nürnberg
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Received on Fri Oct 17 18:42:22 2003

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