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Date: Tue, 2 Sep 2003 13:00:11 -0700
From: Joshua Oreman <oremanj@get-linux.org>
To: Ed Alley <alley1@llnl.gov>
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On Tue, Sep 02, 2003 at 12:37:21PM -0700 or thereabouts, Ed Alley wrote:
> 
> > On Tue, 2003-09-02 at 14:32, Ed Alley wrote:
> >> I'm running FreeBSD-4.8. Sometimes the file permissions for /dev/null get
> >> mysteriously changed by some unknown process to:
> >> 
> >> 	crw------- 1 root wheel 2, 2 Sep 2 11:20 /dev/null
> 
> > On Tue, 2003-09-02 Adam McLaurin wrote:
> > That's very strange indeed. Have you tried using chflags to prevent the
> > permissions from being changed? This should do the trick, albeit a dirty
> > hack.
> 
> Sorry, I didn't mention that I tried setting flags on /dev/null:
> 
> 	chflags schg /dev/null
> 
> What happens is that sendmail complains that it can't open /dev/null.
> 
> Hey! I just realized that this may be a clue! Does sendmail fiddle with
> /dev/null? What happens if sendmail tries to lock /dev/null after it
> opens it? Does schg prevent fcntl from locking /dev/null, if that is
> what sendmail uses?

No. No. No.

schg prevents anyone from writing to said file/device :-(

-- Josh

> 
> 			Ed Alley
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