Setting cred->security field of a newly created process

How do I go about setting the cred->security field of the task_struct of a newly created process? There is no specific condition, all it has to do is assign the security field of the parent to the child, as soon as it is created. I looked into the security_task_struct hook, but apparently that doesn't contain the task_struct of the child(obviously, since it is called before the creation to check for permission), but also the clone_flags variable can't be used because that doesn't contain an option for copying the cred->security field too. Also, when are the hooks cred_alloc_blank, cred_free, cred_prepare, cred_commit & cred_transfer hooks called?