Re: XFS information leak during crash

[Nathan Scott]

On Thu, Nov 03, 2005 at 12:36:29AM +0100, Jan Kasprzak wrote:
> ...
> 	Yes, of course. However, the issue is probably much worse
> on XFS, because on XFS it probably affects not only the files being
> created/extended, but also the files being rewritten. Most other

No, thats not correct - XFS behaves as most filesystems do and
will write over the top of existing data.

> filesystems rewrite the files in-place, so when you rewrite the file,
> even with data=writeback you get only the mix of the old and new
> contents. Not somebody else's random data.

XFS also rewrites files in-place.  You will never get someone else's
current data (that would be metadata corruption...), it would only
ever be uninitialised, previously-free space.  But as I said, other
filesystems have the same window in which this can happen (in the
absence of stronger data ordering/journalling semantics, of course).

cheers.

-- 
Nathan
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