From: Gavin Andresen <gavinandresen@gmail•com>
To: Luke-Jr <luke@dashjr•org>
Cc: bitcoin-development@lists•sourceforge.net
Subject: Re: [Bitcoin-development] Newly introduced DoS
Date: Mon, 26 Sep 2011 16:47:06 -0400 [thread overview]
Message-ID: <CABsx9T1gfuiHj9aR=1gDxtEqJzov5iXRqVEiEBUx-VBcearAZQ@mail.gmail.com> (raw)
In-Reply-To: <201109261517.11245.luke@dashjr.org>
On Mon, Sep 26, 2011 at 3:17 PM, Luke-Jr <luke@dashjr•org> wrote:
> + return DoS(10, error("AcceptToMemoryPool() : transaction with out-of-
> bounds SigOpCount"));
> + return DoS(10, error("ConnectInputs() : tried to
> spend coinbase at depth %d", pindexBlock->nHeight - pindex->nHeight));
> These shouldn't be "DoS"'d, or else you open a new DoS when nodes legitimately
> relay such transactions/blocks.
Huh?
So in the future lets suppose we schedule a change to the acceptable
block rules that allows more SigOps in a block, or allows generation
transaction to be spent before 100 confirmations. At that same time,
the DoS rules will be changed.
You cannot "legitimately" relay those blocks without a scheduled
block-chain-split. If a block-chain-split IS scheduled and the rules
change, then denying service to nodes running old, obsolete versions
of bitcoin is the right thing to do-- it is better to "fail hard" and
find it difficult or impossible to connect to the network rather than
continue with an obsolete client and a non-majority block chain.
(and the third DoS in AcceptBlock(): prev block not found is a
"should be impossible" case, because AcceptBlock is only called when
extending the best-block chain).
--
--
Gavin Andresen
next prev parent reply other threads:[~2011-09-26 20:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-26 19:17 Luke-Jr
2011-09-26 20:47 ` Gavin Andresen [this message]
2011-09-26 20:55 ` Luke-Jr
2011-09-26 21:38 ` Gavin Andresen
2011-09-26 21:53 ` Luke-Jr
2011-09-26 22:34 ` theymos
2011-09-27 0:07 ` Gavin Andresen
2011-09-27 20:08 ` Luke-Jr
2011-09-27 20:23 ` Gregory Maxwell
2011-09-27 20:39 ` Gavin Andresen
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