This adds several new tests to lkdtm. To test non-executability of .rodata, lkdtm's build method shifted around a bit requiring a source file rename. But after some objcopy magic, there is now an architecture-agnostic way to write functions into .rodata.
The atomic under/overflow test was split so that each case could be individually tested. The biggest addition are the usercopy tests (in preparation for CONFIG_HARDENED_USERCOPY, based on grsecurity/PaX's PAX_USERCOPY). This tests both directions (copy_to_from, copy_from_user) of the three error conditions that are checked for: wrong object size, wrong stack frame, and wrong object markings. Unless anyone has blocking comments, I'll send a pull to Greg for this to land in -next soon. -Kees
