Bug#37517: marked as done (xterm: binary files can cause xterm to hang and dump into the printer queue with printerCommand)
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To: submit@bugs.debian.org
Subject: xterm hangs and may print something (using printerCommand)
From: rjs@isil.lloke.dna.fi (Riku Saikkonen)
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Date: 11 May 1999 21:18:53 +0300
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Package: xterm
Version: 3.3.2.3a-11
I got xterm to hang simply by looking at binary data with "cat".
"cat slang0.99.38_0.99.38-6.deb" got the xterm to hang completely (it
doesn't even redraw its window), and "ps" shows that it started an lpr
process:
rjs@anar:~$ ps fxa
...
558 p3 R 0:37 | \_ xterm
559 p2 S 0:00 | | \_ bash
576 p2 S 0:00 | | | \_ cat /heap/debian/misc-deb/slang0.99.
577 p3 S 0:00 | | \_ xterm
578 p3 S 0:00 | | \_ lpr
...
PID 558 was the original xterm that I typed the cat in. Apparently it
forked itself (to PID 577) and the forked copy started up lpr in
another child process (578).
The hung-up xterm also uses up all the available CPU time, probably in
some sort of useless loop.
Destroying the window (via fvwm2's Destroy command) does not kill the
xterm process, but I can kill it manually. After I kill it, "lpq"
shows that the xterm put something in the print queue. I don't have a
printer here, so I don't know what it wants to print, but probably
part of the binary data in the file...
I imagine the binary I catted happened to contain the VTxxx escape
code for using the printer attached to a dumb terminal, and xterm
processed it.
I tried setting the printerCommand resource to "false" (to start
/bin/false...). Then xterm doesn't start up lpr (naturally), but it
still hangs in the same way.
I can't find a way to disable the printer escapes in xterm's man page.
It would be a good thing if they were disabled by default, for
security reasons...
--
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Date: Sun, 2 Mar 2003 17:45:13 -0500
From: Branden Robinson <branden@debian.org>
To: 37517-done@bugs.debian.org
Subject: Re: Bug#37517: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=37517
Message-ID: <20030302224512.GE10257@deadbeast.net>
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On Sun, Mar 02, 2003 at 02:17:46PM -0500, Thomas Dickey wrote:
> > Debian Bug report logs - #37517
> > xterm: binary files can cause xterm to hang and dump into the printer =
queue
> > with printerCommand
>=20
> this one should be closed, since it was addressed in patch #167.
Closing per upstream maintainer.
--=20
G. Branden Robinson |
Debian GNU/Linux | If encryption is outlawed, only
branden@debian.org | outlaws will @goH7Ok=3D<q4fDj]Kz?.
http://people.debian.org/~branden/ |
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