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Date: Tue, 9 Apr 2002 03:40:06 -0700 (PDT)
From: Peter Kusenda <peter.kusenda@adn.sk>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: misc/36923: fdesc file system (partially) crashes FreeBSD 4.1 and 4.3
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>Number:         36923
>Category:       misc
>Synopsis:       fdesc file system (partially) crashes FreeBSD 4.1 and 4.3
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Apr 09 03:50:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Peter Kusenda
>Release:        4.1
>Organization:
>Environment:
FreeBSD 4.1
FreeBSD 4.3
(sorry do not have FreeBSD box by hand, right now)
>Description:
Ordinary user is able to put FreeBSD box (tested on 4.1 and 4.3) into rather unusable state if fdescfs is mounted. After mounting fdescfs on /fdesc mount-point, an ordinary user enters the directory (cd /fdesc) and (in csh, tcsh) types: more std
and presses TAB to let the shell add the rest. After pressing TAB key, system becomes unresponsive, except of possibility to switch between virtual consoles, echoing pinging and maybe doing some other network related work as routing, NATing and so. Network services (daemons) do not respond either. There is no further possibility to manage the system. I have no chance to try it on latest version.
>How-To-Repeat:
Sorry, if this is not really accurate, I do not have a FreeBSD box by hand, right now.

Root mounts the fdescfs file system:
# mkdir /fdesc
# mount_fdesc fdesc /fdesc

A user in csh/tcsh shell tries to type more std and presses Tab key:
> cd /fdesc
> ls
fd/ stdin stdout stderr
> more std[Tab]

now the console I/O and network services hang.

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

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