Oracle Linux 7 Update 4 Brings UEFI SecureBoot, USBGuard Added & Btrfs Supported
Besides incorporating the changes made by Red Hat in RHEL 7.4, Oracle Linux 7 Update 4 has finally added UEFI Secure Boot support with keys signed by Microsoft. Other additions in the name of security include OpenSSH now using SHA-2, a GPG check payload for Yum, NBDE security packages have been added, and USBGuard has also been added to protect against intrusive USB devices.
Oracle also says they continue to support Btrfs in Oracle Linux, contrary to Red Hat Enterprise Linux deprecating Btrfs. Oracle says "Btrfs is the ideal filesystem for supporting containers in the cloud" and they support it with Oracle Linux 7 and their Unbreakable Enterprise Kernel. There are also performance improvements and other work to find with Oracle Linux 7 U4.
More details on Oracle Linux 7 Update 4 via the Oracle Blog.