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[Bug-XBoard] Re: Winboard

From: Leo Dijksman
Subject: [Bug-XBoard] Re: Winboard
Date: Sun, 25 Jan 2004 11:47:05 +0100

I have reproduced the 'problem' here with Amy v0.8.4 and WinBoard 4.2.7,
its reproducable with all older versions of Amy (not with v0.8.6 which is a
to this (at my request Thorsten increased the maximum output of Amy)) and
with Waster and (very probably) Muriel, maby more but I have not test them.

I have a debug file attached where I loaded one of the games of Amy 0.8.3
where WinBoard crashed, after loading the game I set Amy to analise and
winboard comes in problems as soon the long pv appears in the debugfile.
>From that moment WinBoard use more as 50% of my CPU and then crash
after around 15 seconds.

Its reproducable at both Win2000Pro and WinXP Pro, using WinBoard 4.2.7
and all 3,4 and 5 men egtbs (Nalimov), it happen in all cases when the pv
by the engine is _to_ long!

I hope this helps, if you need more info please let me know!


----- Original Message ----- 
From: "Tim Mann" <address@hidden>
To: "Leo Dijksman" <address@hidden>
Cc: <address@hidden>; <address@hidden>
Sent: Sunday, January 25, 2004 2:19 AM
Subject: Re: Winboard

> WinBoard 4.2.7 has a fix for one buffer overflow bug (contributed by
> Daniel Mehrmann), but there are probably more still left.  I don't know
> if anyone else has plans to work on buffer overflows, but I've copied
> this message to address@hidden so that the other developers will be
> aware of the issue too.
> If you can be more specific about exactly what engines cause the crashes
> and when, that would help anyone who finds time to work on them.  A
> WinBoard.debug file would help too.  Thanks.
> On Sun, 28 Dec 2003 23:58:12 +0100, "Leo Dijksman"
<address@hidden> wrote:
> > Hello Tim,
> >
> > I have a question to you :)
> > I have in the past taken some engines out of my wbec ridderkerk tourney
> > because they 'crashed' Winboard, now I have again problems with one
> > and it seems to have to do with point 353 at the todo list:
> > ================================================
> > **353. WinBoard can crash when the engine outputs very long PV lines
> > (or debug output that looks like a PV).  In particular, lines that
> > start with 4 or more blanks following a "thinking" output line are
> > treated as continuation lines, and get concatenated into a 512-byte
> > buffer with no checking for overflow.  Generally we need a lot more
> > care to avoid buffer overflows inside both xboard and WinBoard.
> > [Note: changed the buffers to be 5120 bytes as a band-aid.]
> > =================================================
> >
> > My question is if this is something what can/will be fixed at
> > Xboard/Winboard
> > or is it something the engine author have to change at his engine?
> > If it will be done at XB/WB, can/will you put it high at the todo list
> > please?
> >
> > I think, but I am not sure, that I run into that 'problem' earlier as
> > users
> > because of the pretty long time controle at fast computers and have also
> > ponder=on?
> >
> > Thanks in advance for any answer,
> >
> > Leo Dijksman.
> >
> -- 
> Tim Mann  address@hidden  http://tim-mann.org/

Attachment: WB427_crash.zip
Description: Binary data

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