Messages in this thread |  | | Date | Sun, 3 Sep 2000 19:56:39 +0200 | From | "Andi Kleen" <> | Subject | Re: zero-copy TCP |
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On Sun, Sep 03, 2000 at 07:42:53PM +0200, Ingo Molnar wrote: > > 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
From brief inspection at least arm, mips, m68k have similar problems.
[haven't checked the others]
> design bug. I think some RFCs do even forbid the sending of incorrect > packets?
I do not know any that do. Of course you shouldn't, but the receiver has to handle it anyways.
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