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In-Reply-To: <26b7321b-cc64-44b9-bc95-a4d8feb701e5n@googlegroups.com>
From: Antoine Riard <antoine.riard@gmail.com>
Date: Sat, 29 Jun 2024 02:53:37 +0100
Message-ID: <CALZpt+EwVyaz1=A6hOOycqFGJs+zxyYYocZixTJgVmzZezUs9Q@mail.gmail.com>
Subject: Re: [bitcoindev] Re: Great Consensus Cleanup Revival
To: Eric Voskuil <eric@voskuil.org>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
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Hi Eric,
I meant C pointer and by "more robust" any kind of memory / CPU DoS arising
due to memory management (e.g. hypothetical rule checking the 64 bytes size
for all block transactions).
In my understanding, the validation logic equivalent of core's CheckBlock
is libbitcoin's block::check():
https://github.com/libbitcoin/libbitcoin-system/blob/master/src/chain/block=
.cpp#L751
Best,
Antoine
Le sam. 29 juin 2024 =C3=A0 02:33, Eric Voskuil <eric@voskuil.org> a =C3=A9=
crit :
> Hello Antoine (other),
>
> > If you have code in pure C with variables on the stack no malloc, doin=
g
> a check of the coinbase size after the socket read can be certainly more
> robust than checking a non-null pointer.
>
> Can you please clarify this for me? When you say "non-null pointer" do yo=
u
> mean C pointer or transaction input "null point" (sequence of 32 repeatin=
g
> 0x00 bytes and 4 0xff)? What do you mean by "more robust"?
>
> Thanks,
> Eric
>
> --
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<div dir=3D"ltr">Hi Eric,<div><br></div><div>I meant C pointer and by "=
;more robust" any kind of memory / CPU DoS arising due to memory manag=
ement (e.g. hypothetical rule checking the 64 bytes size for all block tran=
sactions).</div><div><br></div><div>In my understanding, the validation log=
ic equivalent of core's CheckBlock is libbitcoin's=C2=A0block::chec=
k():=C2=A0</div><div><a href=3D"https://github.com/libbitcoin/libbitcoin-sy=
stem/blob/master/src/chain/block.cpp#L751">https://github.com/libbitcoin/li=
bbitcoin-system/blob/master/src/chain/block.cpp#L751</a><br></div><div><br>=
</div><div>Best,</div><div>Antoine</div></div><br><div class=3D"gmail_quote=
"><div dir=3D"ltr" class=3D"gmail_attr">Le=C2=A0sam. 29 juin 2024 =C3=A0=C2=
=A002:33, Eric Voskuil <<a href=3D"mailto:eric@voskuil.org">eric@voskuil=
.org</a>> a =C3=A9crit=C2=A0:<br></div><blockquote class=3D"gmail_quote"=
style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:=
solid;border-left-color:rgb(204,204,204);padding-left:1ex">Hello Antoine (o=
ther),<br><br>>=C2=A0
If you have code in pure C with variables on the stack no malloc, doing a c=
heck of the coinbase size after the socket read can be certainly more robus=
t than checking a non-null pointer.=C2=A0<br><br>Can you please clarify thi=
s for me? When you say "non-null pointer" do you mean C pointer o=
r transaction input "null point" (sequence of 32 repeating 0x00 b=
ytes and 4 0xff)? What do you mean by "more robust"?<br><br>Thank=
s,<br>Eric<br><br>
<p></p>
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