Grsecurity® is an extensive security enhancement to the Linux kernel that defends against a wide range of security threats through intelligent access control, memory corruption-based exploit prevention, and a host of other system hardening that generally require no configuration. It has been actively developed and maintained for the past 14 years. Commercial support for grsecurity is available through Open Source Security, Inc.
In a big red block at the top of their home page is the following warning:
Important Notice Regarding Public Availability of Stable Patches
Due to continued violations by several companies in the embedded industry of grsecurity®'s trademark and registered copyrights, effective September 9th 2015 stable patches of grsecurity will be permanently unavailable to the general public. For more information, read the full announcement.
And I thought GRSecurity was based on the GPL'd work called "Linux". Guess I was wrong.
(Score: 2, Insightful) by Anonymous Coward on Monday September 07 2015, @09:06AM
They complained that a company took unstable code and called it "grsecurity" code (which it was). Now they are limiting access to the stable code, while leaving the unstable code available..
..so that exact situation can still happen. What.
Also:
> stable patches of grsecurity will be permanently unavailable to the general public
I'm sure the people who care about having access to the source code they are running the binaries of will take this gracefully.