root owned writeable files under /sys

[Sumeet Lahorani <sumeet.lahorani-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>]

Hi All,

With ofed 1.5.1 (and it appears to be the case in prior versions as 
well), I see the following files created under /sys which are world 
writeable

# find /sys -type f -perm 222 -ls
  6834    0 --w--w--w-   1 root     root            0 Jun  3 14:50 
/sys/class/infiniband/mlx4_0/diag_counters/clear_diag
  8344    0 --w--w--w-   1 root     root         4096 Jun  3 14:43 
/sys/class/net/ib1/delete_child
  8343    0 --w--w--w-   1 root     root         4096 Jun  3 14:43 
/sys/class/net/ib1/create_child
  8295    0 --w--w--w-   1 root     root         4096 Jun  3 14:43 
/sys/class/net/ib0/delete_child
  8294    0 --w--w--w-   1 root     root            0 Jun  3 14:39 
/sys/class/net/ib0/create_child
  6017    0 --w--w--w-   1 root     root         4096 Jun  3 14:43 
/sys/devices/pci0000:00/0000:00:04.0/0000:13:00.0/port_trigger

ib0 & ib1 are slave interfaces corresponding to the 2 ports on a 
ConnectX HCA.

At least the create_child & delete_child files appear to be dangerous to 
leave as world writeable because they result in resources allocations. 
I'm not sure about the others. Do these have to be world writeable?

- Sumeet

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