/dev/null file permission changes frequently

Hi,
We are experiencing file permission change issue frequently for the
following files:
root@domain5 # ls -l /devices/pseudo/mm@0:null
crw-rw-rw- 1 root sys 13, 2 Apr 22 2009
/devices/pseudo/mm@0:null
root@domain5 # ls -l /dev/null
crw-rw-rw- 1 root sys 13, 2 Oct 25 07:01 /dev/null
By default, above is the file permission settings. If the file permission
changes, it will look like as below:
root@domain5 # ls -l /devices/pseudo/mm@0:null
cr--r--r-- 1 root sys 13, 2 Apr 22 2009
/devices/pseudo/mm@0:null
root@domain5 # ls -l /dev/null
cr--r--r-- 1 root sys 13, 2 Oct 25 07:01 /dev/null
Due to this file permission change the script which uses this file loose
the write permission and the script fails. To fix this issue, we will be
manually changing the permission. Can you please help me to know the cause for
this file permission change.
Thanks,
Ram.

You need to correlate any changes on the system to when you have the problem, or see the date on /dev/null change. Software packages can change this, applications can change this, sometimes even patch installs.
Even certain administrative practices.
Here's one example, where touching a vendor software-created printer config with native Solaris admintool would change /dev/null permissions
http://www.rootunix.org/SOLARIS/printFAQ.txt
10) ONLY ROOT CAN SEND PRINT JOBS:
This problem is caused by network spooling software that for a
network printer that uses /dev/null for the printer device. The
software monitors the queue and spools the print requests over the
network to the printer. If the printer setup is modified in any
way with Admintool, the printer device (/dev/null) permissions will
change to 600 owner lp.

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Last edited by timm (2009-04-03 19:47:00)

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[SOLVED] /dev/null: Permission Denied

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Last edited by Stythys (2010-06-05 17:33:33)

I know it's solved, but I had the same issue today and fixed it like this:
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