Re: Unable to write files greater than 1GB to udf-filesystem after kernel update (Sarge)

[Jan Kara <jack@suse.cz>]

  Hello,

> > beginning with kernel-image-2.6.8-3-k7_2.6.8-16sarge5, I am no longer able to 
> > write files to a DVD-RAM with udf-filesystem which are bigger than 1G. When 
> > copying files greater than the mentioned size to the DVD-RAM, I get the error 
> > message "File size exceeded". Copying smaller files works.
> > 
> > This problem also exists after upgrading to the latest kernel-image 
> > 2.6.8-15sarge6. 
> > 
> > When reverting back to the old kernel (kernel-image-2.6.8-3-k7_2.6.8-16sarge4) 
> > or when formatting the medium with an ext2-filesystem, the problem 
> > disappears, so this problem seems to be related to the udf-filesystem.
> > 
> > I did a Google search and found a posting with the same problem which seems to 
> > affect Debian Etch testing only:
> > http://groups.google.com/group/linux.debian.user/browse_thread/thread/1eab67989a25fe8a/b3c075459da58131?lnk=gst&q=file+size+exceeded+1GB
> > 
> > I did not find anything related in the Debian Bug-tracker.
> > 
> > Am I missing a parameter or option to be able to write files greater than 1GB 
> > to an udf-filesystem after upgrading?
> 
> hey Omer,
>   Upstream's solution[1] to handle this security problem was to
> disable extents > 1G in UDF, so that is what we backported for a
> security update. 
> 
> Does the UDF filesystem only allow 1 extent per file? If not, is it
> possible to change the patch to actually limit extent sizes instead of
> the overall size of the file?
  Yes it is possible. It just requires non-trivial work (rewriting
several places in UDF code). Anyone is welcome to do this. Eric Sandeen
from RedHat may be working on it (or me if I find time but it won't be
before Christmas).

								Honza
-- 
Jan Kara <jack@suse.cz>
SuSE CR Labs