nfsiod tasks started in error
kris at obsecurity.org
Thu Apr 7 13:36:28 PDT 2005
On Thu, Apr 07, 2005 at 01:29:48PM -0700, Brooks Davis wrote:
> On Thu, Apr 07, 2005 at 04:11:55PM -0400, bob at a1poweruser.com wrote:
> > During sysinstall answered no to the server and client nfs questions
> > and after installed completed and system rebooted I see task
> > nfsiod1,2,3,4 running in output of ps ax command. This was not the
> > case in any of the 4.x releases. This can be looked upon as a
> > security leak. This may be a error in the new boot up process. This
> > was first reported 1/16/2004 in 5.2 RC2 as Problem Report kern/61438
> > and again in 5.3 as Problem Report kern/79539
> > I tried to run /usr/local/etc/rc.d/killnfs.sh script to kill these
> > unwanted tasks but that does not work.
> > Any suggestions on how I can kill these bogus nfs tasks as part of
> > boot up or what to change in the boot up process so these tasks
> > don't get started in the first place? Doing a manual recompile of
> > the kernel to remove the nfs statements is not a viable solution.
> nfsiod now runs as a kernel process and is control by these sysctls:
> vfs.nfs.iodmaxidle: 120
> vfs.nfs.iodmin: 4
> vfs.nfs.iodmax: 20
> It looks like setting vfs.nfs.iodmin=0 and then klling them off works.
> We probably should think about changing the default to 0 and setting
> appropriate values via /etc/rc.d/nfs. Over all, I can't say this is a
> very high priority though patches would certaintly be accepted.
This was a deliberate change by Peter, since if you have NFSCLIENT in
the kernel it's assumed you want to use the machine as a NFS client.
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