From: Alexander Viro <viro@math.psu.edu>
To: 9fans@cse.psu.edu
Subject: [9fans] [RFC] sysremove()/sysmount() race
Date: Mon, 5 Mar 2001 03:37:34 -0500 [thread overview]
Message-ID: <Pine.GSO.4.21.0103050316310.23684-100000@weyl.math.psu.edu> (raw)
Folks, AFAICS there is a window during mount() when you
can remove() the mountpoint. There's no locking between namec()
and cmount(), so as far as I can see there's nothing to stop
sysremove() from happening in that window. Since nothing is mounted
yet, we end up removing the mountpoint (after mount we would attempt
to remove the root of mounted fs).
I'm not saying that it's a bug, but... how well does userland
deal with that? AFAICS kernel should be OK...
Cheers,
Al
PS: ssh'd from a Linux box that runs 2.4.2+namespaces patch. 2 users,
5 different namespaces right now... ;-) Off to porting libfs...
next reply other threads:[~2001-03-05 8:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-05 8:37 Alexander Viro [this message]
2001-03-05 8:54 Russ Cox
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