The summary says it all... This is an ebuild for the latest versions used by grsec-kernel. There's a root exploit in previous kernels, so this one should be included. Reproducible: Always Steps to Reproduce: 1. 2. 3.
Created attachment 21556 [details] the ebuild in question
gradm and grsec-sources have been bumped in portage. I did not use your ebuild as provided. No hppa patches exist for 2.4.23 as of yet.
gradm has also been bumped for x86 to 1.9.23