ipc_check_perms — check security and permissions for an IPC
int ipc_check_perms
(struct kern_ipc_perm * ipcp, struct ipc_ops * ops, struct ipc_params * params);
ipc permission set
the actual security routine to call
its parameters
This routine is called by sys_msgget, sys_semget and sys_shmget when the key is not IPC_PRIVATE and that key already exists in the ids IDR.
On success, the IPC id is returned.
It is called with ipc_ids.rw_mutex and ipcp->lock held.