Create IMA machine owner blacklist keyrings (EXPERIMENTAL)

configname: CONFIG_IMA_BLACKLIST_KEYRING

Linux Kernel Configuration
└─>Security options
└─>Create IMA machine owner blacklist keyrings (EXPERIMENTAL)
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This option creates an IMA blacklist keyring, which contains all
revoked IMA keys. It is consulted before any other keyring. If
the search is successful the requested operation is rejected and
an error is returned to the caller.