Is it fine to remove the world-writable permission for /dev/stdin ?

Solution Verified - Updated -

Issue

  • Is it fine to remove the world-writable permission for /dev/stdin ?

  • What are the below files used for ?

    /dev/XOR 
/dev/full 
/dev/log 
/dev/null 
/dev/ptmx 
/dev/random 
/dev/zero 
/var/run/acpid.socket 
/var/run/dbus/system_bus_socket

Environment

Red Hat Enterpeise Linux 5

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