Bug 249473

Summary: File magic file wrongly identifies text file as MPEG-4 LO-EP audio stream
Product: Red Hat Enterprise Linux 5 Reporter: Rodrigo Barbosa <rodrigob>
Component: fileAssignee: Tomas Smetana <tsmetana>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: low    
Version: 5.0CC: psplicha
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OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2009-01-20 22:02:51 UTC Type: ---
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Sample file to reproduce the bug none

Description Rodrigo Barbosa 2007-07-24 21:16:49 UTC 
Description of problem:
File will identify any text file starting with "Má" (iso-8859-1) as a MPEG-4
LO-EP audio stream. Since that character combination is fairly common on several
languages, this can cause serious problems.

Version-Release number of selected component (if applicable):
file-4.17-9

How reproducible:
Attached file

Steps to Reproduce:
1. $ file magic-bug-sample.txt

  
Actual results:
magic-bug-sample.txt: MPEG-4 LO-EP audio stream

Expected results:
magic-bug-sample.txt: ISO-8859 text

Additional info:
Comment 1 Rodrigo Barbosa 2007-07-24 21:16:49 UTC 
Created attachment 159888 [details]
Sample file to reproduce the bug
Comment 2 Tomas Smetana 2008-02-01 09:43:16 UTC 
You're right.  I think we should rather remove support for the MPEG LO-EP format
-- it's very rare and if it really can be determined by the first two bytes
only, it makes more sense to report the text files correctly.
Comment 3 Rodrigo Barbosa 2008-02-01 16:10:19 UTC 
That is pretty much what I have been doing on my server. Removing the support
for that format and recompiling the mgc file.
Interesting too is the fact this only happens with the regular (non-mime) file
detection. The mime-type detection shows the file correctly, which points to
further problems, since there is a discrepancy between the regular and the
mime-type magic files.
Comment 4 RHEL Program Management 2008-06-04 22:49:01 UTC 
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.
Comment 9 errata-xmlrpc 2009-01-20 22:02:51 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2009-0208.html