491267 - Potential DoS: Hang 100% cpu when open a text file with a large amount of semicolons

Status: RESOLVED INCOMPLETE

(Firefox :: File Handling, defect)

Description

[Santa Maria]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10

Open a TextFile (10MB or larger) with a lot of semicolons (;) in the Fx directly causes a DoS. Only closing the tab or stop button makes the Fx usable again.
The txt file can be local or from the net.

Reproducible: Always

Steps to Reproduce:
1. open (or create, if you don't have one) a *.txt File (10MB) with a lot of semicolons
2. open this textfile with the Firefox directly
Actual Results:  
Browser Hangs, 100% CPU usage

Expected Results:  
open the txt file completely 

this bug was tested on other machines and in a clean environment

Comment 1

[Santa Maria]

the bug is not related to the Fx 2.x

Comment 2

[Ernst de Haan]

This bug report needs a good test case.

Can you provide a link to such a text file on a (public) webserver somewhere?

Comment 3

[Santa Maria]

here you have a sample file:
http://admin4me.de/semi.txt
(attention: open this file only in a test environment)

Comment 4

[Ernst de Haan]

Confirmed on Mac OS X 10.5.6 (nl_NL) / Firefox 3.5b4 (nl_NL). I'll attach some technical information on the not-responding Firefox process.

I took this about 10 minutes after entering the specified URL. Note that Firefox had no network activity by that time anymore, I checked in the Activity Monitor application.

Comment 5

[Ernst de Haan]

Attachment: Information on the hanging Firefox process, produced by the Activity Monitor app

Comment 6

[Tyler Downer [He/Him]]

This bug was reported using Firefox 3.0 or older, which is no longer supported. The bug has also not been changed in over 500 days and is still in UNCO.
Reporter, please retest this bug in Firefox 3.6.10 or later using a fresh profile, http://support.mozilla.com/en-US/kb/managing+profiles. If you still see this problem, please update the bug. If you no longer see the bug, please set the resolution to RESOLVED, WORKSFORME.

This is a mass search of unconfirmed bugs that have no activity on them, so if you feel a bug was marked in error, just remove the CLOSEME comment in the whiteboard within the next month.

Comment 7

[Ernst de Haan]

(In reply to comment #3)
> here you have a sample file:
> http://admin4me.de/semi.txt
> (attention: open this file only in a test environment)

Is this file still available somewhere? Without the file, I cannot attempt to reproduce the issue on Firefox 3.6 or 4.0.

Comment 8

[Tyler Downer [He/Him]]

No reply, INCOMPLETE. Please retest with Firefox 3.6.12 or later and a new profile (http://support.mozilla.com/kb/Managing+profiles). If you continue to see this issue with the newest firefox and a new profile, then please comment on this bug.