On Sat, 8 Sep 2007, Antti Harri wrote:

quoted text
> Hello,
> 
> First just plain directory with mode=700:
> 
> drwx------   43 root     wheel        2048 Sep  7 22:24 /backups/
> 
> Then I mount filesystem under /backups:
> 
> /dev/sd0i on /backups type ffs (local, softdep)
> drwxr-x---   43 root     wheel        2048 Sep  7 22:24 /backups/
> 
> The permissions changed, so far good because I've changed
> the modes of the mounted volume to 750.
> 
> Then as a normal user belonging to 'wheel' I do:
> 
> $ ls -la /backups/
> ls: /backups/..: Permission denied
> [rest of the files are listed normally, including '.']
> 
> $ stat /backups/..
> stat: /backups/..: Permission denied
> 
> Doing those as root is fine.
> 
> I asked my friend to reproduce this on Linux but
> he was unable get any weird errors, therefore
> I'm asking here. :-)

It's not a bug, see mount(2).

	-Otto