Debian bug report logs - #1702
telnet+su root->thermal process

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From server.et-inf.fho-emden.de!tobias Thu Oct 19 03:08:05 1995
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Subject: Re: Bug#1702: telnet+su root->thermal process
To: richard@sfere.elmail.co.uk, debian-bugs@Pixar.com
Date: Thu, 19 Oct 1995 10:58:01 +0100 (MET)
From: "Peter Tobias" <tobias@server.et-inf.fho-emden.de>
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In-Reply-To: <8MxkrSOM2@sfere.elmail.co.uk> from "Richard Kettlewell" at Oct 18, 95 07:27:02 pm
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Richard Kettlewell wrote:
> Package: bash
> Version: 1.14.4-2
[...]
> I've had a prod around but I still don't understand what is going on.
> At first I thought that it was just that the rogue bash was ignoring
> SIGHUP or something; however manually SIGHUPing it (instead of closing
> the telnet connection) contradicts this.
> 
> It may be that the bug is in telnetd rather than bash, but the fact
> that bash starts eating CPU when it loses its tty is a bug in itself.

I just tried it with the csh and it works.


Peter

-- 
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From sfere.elmail.co.uk!richard Wed Oct 18 11:25:38 1995
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From: richard@sfere.elmail.co.uk (Richard Kettlewell)
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Date: Wed, 18 Oct 95 19:27:02 +0100 (BST)
To: debian-bugs@pixar.com
Subject: Re: telnet+su root->thermal process
In-Reply-To: <Pine.LNX.3.91.951019004517.16324B-100000@spark.net.hk>
References: <Pine.LNX.3.91.951019004517.16324B-100000@spark.net.hk>

Package: bash
Version: 1.14.4-2

william@spark.net.hk writes:
>Hi debian ppl,
>
>	I just wonder if anybody has this problem too 'cos my debian is 
>upgrading from old debian packages.
>
>telnet localhost
><login and passwd checking>
>su root
>more /etc/inetd.conf (any long text file will do)
>press ctrl-] and quit to terminate the telnet session
>now...there is a crazy bash running there and will eat up all the cpu 
>time shortly!
>
>	I'm looking for a quick fix 'cos I always need to telnet to 
>server for my works.

Does the same to me.

The quick fix is ``don't do that then'' - quit `more' by hitting `q',
close the session by terminating bash (hit ^D or type `exit') rather
than chopping off the telnet connection from your end.

I've had a prod around but I still don't understand what is going on.
At first I thought that it was just that the rogue bash was ignoring
SIGHUP or something; however manually SIGHUPing it (instead of closing
the telnet connection) contradicts this.

It may be that the bug is in telnetd rather than bash, but the fact
that bash starts eating CPU when it loses its tty is a bug in itself.

ttfn/rjk