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<TITLE>sane-devel: Re: EOF detection</TITLE>
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<META NAME="Author" CONTENT="Marian Eichholz (marian.eichholz@freenet-ag.de)">
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<META NAME="Subject" CONTENT="Re: EOF detection">
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<H1>Re: EOF detection</H1>
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<!-- received="Thu May 10 01:53:41 2001" -->
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<!-- name="Marian Eichholz" -->
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<!-- subject="Re: EOF detection" -->
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<!-- inreplyto="20010508183110.B25971@ecs.soton.ac.uk" -->
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<STRONG>From:</STRONG> Marian Eichholz (<A HREF="mailto:marian.eichholz@freenet-ag.de?Subject=Re:%20EOF%20detection&In-Reply-To=<3AFA5A51.B2EBBD28@freenet-ag.de>"><EM>marian.eichholz@freenet-ag.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu May 10 2001 - 02:07:29 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0108.html">Miroslav BENES: "Drivers for HP S20 USB"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0106.html">Marian Eichholz: "Re: EOF detection"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0095.html">Nick Lamb: "Re: EOF detection"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0109.html">mh: "Re: EOF detection"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0096.html">Henning Meier-Geinitz: "Re: EOF detection"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0109.html">mh: "Re: EOF detection"</A>
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<HR NOSHADE><P>
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<P>
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Nick Lamb wrote:
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<BR>
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<P><EM>> > I did't look into the new scanning code, but 0.74 had in fact a
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</EM><BR>
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<EM>> > vulnerability (buffer overrun), if the backend offers actually more data
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</EM><BR>
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<EM>> > than was precalculated by the front end.
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > This is/was really a bug in the front end Xsane, because the parameters
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</EM><BR>
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<EM>> > to sane_read (aount of data requestet) don't mention the coming end of
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</EM><BR>
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<EM>> > the buffer (always requesting 64K/8K).
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I'm having trouble understanding this, can you give a concrete example,
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</EM><BR>
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<EM>> showing the SANE API calls made by Xsane, the response from the backend
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</EM><BR>
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<EM>> and where this leads to an overrun?
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</EM><BR>
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<P>Perhaps I can sniff some debugging output. Unfortunately not here and
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<BR>
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now :-(
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<BR>
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<P>The point is, that the Xsane frontend allocates a buffer, depending on
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<BR>
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the sane_param(? I don't have the specs here?) call returning the
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<BR>
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dimensions of the scan window.
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<BR>
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<P>Despite this, the frontend always requests blocks of 8KB (gray) and 64KB
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<BR>
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(RGB), even if the end of the allocated
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<BR>
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picture buffer lies within this chunk size and cannot swallow this whole
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<BR>
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chunk.
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<BR>
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<P>Thus, any backend that is keen to deliver actually more data than XSane
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<BR>
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expects, will overflow XSane's scan buffer.
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<BR>
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<P>You I right, I have to deliver some body of evidence :-)))
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<BR>
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<P>Mit freundlichen Gruessen / Yours sincerely
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<BR>
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<P>Marian Eichholz
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<BR>
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<P>- - - - - - - - - - -
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<BR>
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Marian Eichholz
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<BR>
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Postmaster
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<BR>
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freenet.de AG Vorsitzender des Aufsichtsrates: Gerhard Schmid
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<BR>
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Deelb<EFBFBD>genkamp 4c Vorstand: Eckhard Spoerr (Vors.), Axel Krieger
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<BR>
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22297 Hamburg Amtsgericht Hamburg, HRB 74048
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<BR>
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<P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0108.html">Miroslav BENES: "Drivers for HP S20 USB"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0106.html">Marian Eichholz: "Re: EOF detection"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0095.html">Nick Lamb: "Re: EOF detection"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0109.html">mh: "Re: EOF detection"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0096.html">Henning Meier-Geinitz: "Re: EOF detection"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0109.html">mh: "Re: EOF detection"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Thu May 10 2001 - 02:04:31 PDT</EM>
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