Re: and now, back to your regularly scheduled discussion topic...

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Patrick Horgan said:
>> and now for something completely different (apologies to M. Python):
>> 
>> ObBug:  i have recently discovered that it is possible to re-export an
>> imported filesystem under Linux.  to illustrate:
>> 
>> hostA --> exports /usr/share to -access=hostB
>> hostB --> a linux box.  re-exports /usr/share to everyone
>> hostC --> not implicitly trusted by hostA, mounts /usr/share
>> 
>> aside from any security concerns, this would certainly thrash your nfsd's.
>> does anyone have any experience with this?  i have only recently discovered
>> this, and have not had time to peruse it in depth.
>> 
>
>Are you sure about this?  Any system using nfs will allow this, but the
>directory they mount from hostB is the mount directory, not the /usr/share
>form hostA.

Ah, but Linux uses a user level nfs server, which does a couple odd
things.  Not only will it allow the above, but it exports across
partition boundaries (i.e., if /usr and /usr/local are different
partitions, and you export /usr, /usr/local goes along with it.  Most
nfs implementations (All Sun derived?) will give whatever is 'under'
/usr/local instead).

Philip Guenther
guenther@stolaf.edu

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