My Review of "Cracking Drupal" by Greg Knaddison

Cracking Drupal's goal is to help Drupal maintainers and module developers recognize, diagnose, and ultimately prevent security issues, from the perspective of code. It gives a good overview of how to think about security when building and/or analyzing custom, contributed or core modules. With included code examples and some real world cases, the book presents a good foundation to build from.