Mea maxima culpa, gentlemen. The source of many of the errors was LibSafePlus, a library recently released and published in Usenix, and which I had ben testing. I would have to look more closely at the getsebool source code to see why specifically it would cause that binary to fail. But it caused many to do so. (LibSafePlus by default adds itself to ld.so.preload.) That solved the sudo and X login problems. I'm curious enough to wonder why I got the specific error messages I got with this library, so I will investigate further at a later date. That leaves the issue of accounts in the NIS directory. There is one that does indeed have an /etc/ home, and I will need to look out for that because I can see that it will continue to cause /etc/ to be mis-contexed, but I suspect this problem will be relatively cosmetic. Many thanks!
