Thunderbolt Updates Head Into Linux 4.17, Adds USB/SL4 Security Level

Written by Michael Larabel in Hardware on 7 April 2018 at 06:31 AM EDT. Add A Comment
Greg Kroah-Hartman's char/misc pull this week included a fair amount of Thunderbolt support improvements for the forthcoming Linux 4.17 kernel.

Thunderbolt changes queued for Linux 4.17 include support for the new Intel Titan Ridge controller, support for a USB-only SL4 security level, prevent crashes when the ICM firmware is not active, support for a pre-boot ACL, handling for rejected Thunderbolt devices, and other error handling improvements and Thunderbolt related fixes.

The SL4/USB-only Thunderbolt option is part of the ongoing Thunderbolt security level work for allowing the user to restrict the access rights of Thunderbolt devices connected to a system. On the desktop side it's being wired up through Red Hat's Bolt project and now there is the "SL4" security level where only USB support would be allowed to the connected device(s).

There are also NVMEM updates, hardware tracing driver updates, Parport updates, and other changes as outlined in full via the char/misc pull request.
Related News
About The Author
Michael Larabel

Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

Popular News This Week