HEADS UP: Important bug fix in ZFS replay code!

Barry Pederson bp at barryp.org
Thu Dec 10 18:27:31 UTC 2009

On 11/10/09 4:45 PM, Pawel Jakub Dawidek wrote:
> Hi.
> There was important bug in ZFS replay code. If there were setattr logs
> (not related to permission change) in ZIL during unclean shutdown, one
> can end up with files that have mode set to 07777.
> This is very dangerous, especially if you have untrusted local users, as
> this will set setuid bit on such files. Note that FreeBSD will remove
> setuid bits when someone will try to modify the file, but it is still
> dangerous.
> You can locate such files with the following command:
> 	# find / -perm -7777 -print0 | xargs -0 ls -ld
> You can locate and fix such files with the following command:
> 	# find / -perm -7777 -print0 | xargs -0 chmod a-s,o-w,-t

I just noticed this fix didn't make it into 8.0, I just had an 
8.0-RELEASE-p1 machine crash and come back with a bunch of 07777 files.

Maybe this should be documented as an errata or security advisory.


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