Number of CPUs detected by Bind 9.4.2 on 4 CPU system runningRedHat es 4.

[Jeff Lightner]

Just for the heck of it I tried mounting /proc in a subdirectory with
the ro option but was still able to update my shmmax kernel parameter
echoing a new value to it.  This was done as the root user but I thought
when mounted ro even root shouldn't be able to write to it.  Is this a
bug an issue with the way --bind does the mount?  Interestingly mount
did show the filesystem has the ro option after the mount.

-----Original Message-----
From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org] On
Behalf Of Mark Andrews
Sent: Tuesday, April 01, 2008 6:24 PM
To: Adam Tkac
Cc: Lars Hecking; bind-users at isc.org
Subject: Re: Number of CPUs detected by Bind 9.4.2 on 4 CPU system
runningRedHat es 4. 


> On Tue, Apr 01, 2008 at 05:57:01PM +0100, Lars Hecking wrote:
> > Adam Tkac writes:
> > [...] 
> > > After quick look into bind and glibc code /proc has to be mounted.
> > > named calls sysconf(3) function and internal glibc implementation
> > > looks like this:
> > [...]
> > 
> >  Not that I have looked at the code, but maybe bind should grab this
info
> >  before dropping privileges and going to jail ...
> > 
> 
> Yes, this will be the best long term solution. I'm going to prepare
> simple patch to fix this problem.
> 
> Adam
> 
> -- 
> Adam Tkac, Red Hat, Inc.

	/proc is also needed for IPv6 interface scanning.

	This is a design fault in Linux.
	The correct fix is to correct the design fault in the OS.

	Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org
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