Date: Wed, 12 Dec 2001 11:31:25 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Jordan Hubbard <jkh@winston.freebsd.org> Cc: hackers@FreeBSD.ORG Subject: Re: NFS: How to make FreeBSD fall on its face in one easy step Message-ID: <200112121931.fBCJVPp79265@apollo.backplane.com> References: <200112121623.fBCGNuY52543@winston.freebsd.org>
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Oooh. Very cool! I'll start messing with it (oops, that's going to
make both Paul and Alfred annoyed with me!)
-Matt
:It came up in a meeting today at Apple just how fragile the BSD NFS
:implementation was before significant work was put in to stabilizing it,
:and in that discussion came up a little test tool written originally by
:Avie Tevanian and subsequently improved by one of the folks here.
:
:This tool basically tries to do everything it can (legally) to confuse an
:NFS server. It seeks around, does I/O to and truncates/changes the size
:of a test file, all while doing everything it can to detect data corruption
:or other signs of misbehavior which might result from out-of-order replies
:or any other previously-observed NFS pathology. Very few NFS implementations
:apparently survive this test and FreeBSD's is no exception. The sources are
:provided below, courtesy of Avie, for the education and enjoyment(?) of
:anyone who's motivated to play with (or even pretends to understand) NFS.
:
:Usage:
: cc fsx.c -o fsx
: ./fsx /some/nfs/mounted/scratchfile
: [ ** kaboom! ** ]
:
:I'm also trying to determine which of the fixes Apple has made to NFS might
:be adapted to FreeBSD, something which is made more difficult by the fact
:that much of the code was taken straight from 4.4 Lite some time back and
:both operating systems have diverged significantly since then. Anyone
:really keen on investigating this further themselves on it can also go to
:http://www.opensource.apple.com/projects/darwin and register themselves
:online (it's easy) to access the Darwin CVS repository, the module in
:question being "xnu" (the Darwin kernel). Thanks.
:
:- Jordan
:
:...
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