grep Pocket Reference
John Bambenek & Agnieszka Klus
Linux Device Drivers
Jonathan Corbet & Alessandro Rubini & Greg Kroah-Hartman
Linux System Programming
Robert Love
Metasploit: The Penetration Tester's Guide
David Kennedy, Jim O'Gorman, Devon Kearns, Mati Aharoni
The Hardware Hacker
Andrew Bunnie Huang