$ ./ppptest            # baseline (X86_64_NG7)
got 40-byte frame on pppoe ethernet hook
pppoe payload 20 bytes; tags:
  tag type=0x0103 len=8 value=80ba748900f8ffff
  HOST_UNIQ = 0x80ba748900f8ffff  (byte-swapped print; LE = 0xfffff8008974ba80)
  tag type=0x0101 len=4 value=74657374 ("test")
# -> kernel heap pointer 0xfffff8008974ba80 broadcast in PADI HOST_UNIQ
$ (apply fix.diff; make nativekernel; install; reboot -> #1 21:34:11)
$ ./ppptest            # fixed kernel
  tag type=0x0103 len=8 value=edf6485b58d4a50b
# -> random karc4random64 cookie, no kernel pointer; session machinery intact