Load X509 certificate onto the '.ima' trusted keyring

configname: CONFIG_IMA_LOAD_X509

Linux Kernel Configuration
└─>Security options
└─>Load X509 certificate onto the '.ima' trusted keyring
In linux kernel since version 3.10 (release Date: 2013-06-30)  
File signature verification is based on the public keys
loaded on the .ima trusted keyring. These public keys are
X509 certificates signed by a trusted key on the
.system keyring. This option enables X509 certificate
loading from the kernel onto the '.ima' trusted keyring.