If you run a jail, and inside that jail is a /dev with the file /dev/null in 
it, the normal 0666 permissions of /dev/null will often get changed to 0600.

I cannot see any reason why this would happen - I thought maybe there was 
something in /etc/rc that would do it, but there is not.  Further, the 
reversions seem random and irregular - happens in some jails, doesn't in 
others.

I have witnessed this on multiple jails in multiple different physical 
machines, on versions from 4.4 to 4.6.2.

Anyone have any ideas why this happening ?  Has anyone else seen this ?

Perhaps /dev/null is not the only one this happens to, but just the most 
noticable one ? (many programs break when /dev/null is 0600)



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