Yama: higher restrictions should block PTRACE_TRACEME

Yama: higher restrictions should block PTRACE_TRACEME

commit 9d8dad742ad1c74d7e7210ee05d0b44961d5ea16 upstream.

The higher ptrace restriction levels should be blocking even
PTRACE_TRACEME requests. The comments in the LSM documentation are
misleading about when the checks happen (the parent does not go through
security_ptrace_access_check() on a PTRACE_TRACEME call).

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>