MIME-Version: 1.0
From: Mark Boldyrev <markboldyrev@gmail.com>
Date: Fri, 19 May 2017 09:07:41 +0300
Message-ID: <CAK9dXBSg+wzAZw7_xPXRVvx1uZzjAEE8nuvj0vkdSGD-yTfwhQ@mail.gmail.com>
To: bitcoin-dev@lists.linuxfoundation.org
Content-Type: multipart/alternative; boundary="001a11410b78d0404a054fda567f"
Subject: [bitcoin-dev] A proposal to reintroduce the disabled script opcodes
Precedence: list

--001a11410b78d0404a054fda567f
Content-Type: text/plain; charset="UTF-8"

Back in 2010, there was a bug found in Core which allowed denial-of-service
attacks due to the software crashing on some machines while executing a
script - see CVE-2010-537.
I believe the removed ("disabled") opcodes should be re-introduced along
with a standardized behavior definition.
For example, when execution of an opcode results in an arithmetic error,
such as OP_DIV with a zero divisor, the script should exit and fail.
The string splice opcodes should also check their arguments for
correctness, etc.

These opcodes would enhance the flexibility of scripts and allow
sophisticated native smart contracts to be created.

--001a11410b78d0404a054fda567f
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><span style=3D"font-size:12.8px">Back in 2010, there was a=
 bug found in Core which allowed denial-of-service attacks due to the softw=
are crashing on some machines while executing a script - see CVE-2010-537.<=
/span><div style=3D"font-size:12.8px">I believe the removed (&quot;disabled=
&quot;) opcodes should be re-introduced along with a standardized behavior =
definition.</div><div style=3D"font-size:12.8px">For example, when executio=
n of an opcode results in an arithmetic error, such as OP_DIV with a zero d=
ivisor, the script should exit and fail.</div><div style=3D"font-size:12.8p=
x">The string splice opcodes should also check their arguments for correctn=
ess, etc.</div><div style=3D"font-size:12.8px"><br></div><div style=3D"font=
-size:12.8px">These opcodes would enhance the flexibility of scripts and al=
low sophisticated native smart contracts to be created.</div></div>

--001a11410b78d0404a054fda567f--