Re: zero-copy TCP

From: Ingo Molnar (
Date: Sun Sep 03 2000 - 12:42:53 EST

On Sun, 3 Sep 2000, Andi Kleen wrote:

> You can already cause incorrect checksums on the wire just by passing
> a partly unmapped address (the zero-the-rest exception handler in
> csum_copy_generic in i386 forgets to add in the carry)
> I do not believe it is a big deal, packets with bad checksum are not
> really a problem (you can usually do other better DoS that do not need
> it)

i think it's a quality of implementation issue. The csum_copy_generic
thing is a bug. Allowing incorrect checksums to be sent out would be a
design bug. I think some RFCs do even forbid the sending of incorrect


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