Bug#1702: debian bash bug

[Guy Maor <maor@ece.utexas.edu>]

Richard Kettlewell <richard@greenend.org.uk> writes:

> Still there in 1.14.6-5.

I really can't duplicate it.  What am I doing wrong?  Here's a
typescript of what I'm doing.

I also ran an strace on the su'd bash, and it looked ok.  The bash got
a SIGHUP and exited.  You wrote before:

> 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.

Do you mean that SIGHIPing it would close the connection correctly?
Perhaps the bug was in telnetd not sending the SIGHUP or that the
first bash wouldn't SIGHUP the second?

Anyway here's the script:

Script started on Wed Oct 23 16:23:56 1996
bash$ telnet localhost
Trying 127.0.0.1...
Connected to loopback.
Escape character is '^]'.
Linux i586 2.0.23 (slip-77-7.ots.utexas.edu ttyp6)

femto login: gmaor
Password: 
Last login: Wed Oct 23 16:22:16 from loopback
Linux femto 2.0.23 #6 Sat Oct 19 00:00:25 CDT 1996 i586
  4:24pm  up 1 day, 23:30h,  7 users,  load average: 0.02, 0.03, 0.00
]0;femtofemto[~]$ tty
/dev/ttyp6
femto[~]$ ps tp6
  PID  TT   TIME COMMAND                                                       
 8797  p6  0.17s -bash                                                          
 8803  p6  0.07s ps tp6                                                         
femto[~]$ su root
Password:
RoOt@femto[~]$ ' ps tp6
  PID  TT   TIME COMMAND                                                       
 8804  p6  0.14s bash                                                           
 8809  p6  0.07s ps tp6                                                         
 8797  p6  0.17s -bash                                                          
RoOt@femto[~]$ more /etc/inetd.conf 
# /etc/inetd.conf:  see inetd(8) for further informations.
#
# Internet server configuration database
#
#
# Lines starting with "#:LABEL:" or "#<off>#" should not
# be changed unless you know what you are doing!
#
# <service_name> <sock_type> <proto> <flags> <user> <server_path> <args>
#
#:INTERNAL: Internal services
#echo		stream	tcp	nowait	root	internal
#echo		dgram	udp	wait	root	internal
discard		stream	tcp	nowait	root	internal
discard		dgram	udp	wait	root	internal
daytime		stream	tcp	nowait	root	internal
daytime		dgram	udp	wait	root	internal
#chargen		stream	tcp	nowait	root	internal
#chargen		dgram	udp	wait	root	internal
time		stream	tcp	nowait	root	internal
time		dgram	udp	wait	root	internal

--More--(30%)
telnet> Connection closed.
bash$ ~ ps tp6
  PID  TT   TIME COMMAND                                                       
No processes available.
bash$ 
Script done on Wed Oct 23 16:24:53 1996


Guy

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