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Re: mount -o extattr (extended attributes)
On Jun 16, 2011, at 3:22 29PM, Emmanuel Dreyfus wrote:
> Thor Lancelot Simon <tls%panix.com@localhost> wrote:
>> But since the extended attribute database isn't validated by fsck, the
>> kernel can still suddenly crash at that point, no?
> I did not observe that with -o extattr, at least yet. The EA code makes
> some efforts to sanity check what it finds. I think my problems were
> caused by reading file from a dirty filesystem before fsck.
But can it happen? Is the kernel code that deals with this database
sufficiently robust that it *cannot* crash if it reads garbage? Do
we need an fsckeattr program? Is there the potential for semantic
errors in using this data if a piece of an attribute is missing
(perhaps because of the write ordering that Thor mentioned)?
--Steve Bellovin, https://www.cs.columbia.edu/~smb
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