New submission from Terry Greeniaus <terrygreeni...@gmail.com>:
I'm using Python 3.8.5 on a 2016 MacBook Pro running macOS Catalina 10.15.3. This model has a touch bar and macOS communicates with the touch bar via a dedicated "iBridge" network interface. The iBridge network interface uses a fixed MAC address that is common across all MacBook Pro models (ac:de:48:00:11:22). Normally uuid.uuid1() picks up my WiFi MAC address (which is obviously unique), but this evening I noticed it was generating UUIDs based on the iBridge MAC address. Since the iBridge MAC is shared across all MacBook Pro laptops, there's no way to guarantee that the UUIDs are now universally unique. I'm not sure what triggered uuid.uuid1() to start using my iBridge interface although there was an Internet outage here at some point so maybe the network interfaces got reordered. The iBridge interface (en5) does appear before my WiFi interface (en0) in the output of ifconfig now. Here's a quick example of the problem: greent7@avocado:~$ python3 Python 3.8.5 (default, Jul 21 2020, 10:48:26) [Clang 11.0.3 (clang-1103.0.32.62)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import uuid >>> uuid.uuid1() UUID('32bbad32-de12-11ea-a0ee-acde48001122') And here's the output from ifconfig: greent7@avocado:~$ ifconfig lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP> inet 127.0.0.1 netmask 0xff000000 inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 nd6 options=201<PERFORMNUD,DAD> gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280 stf0: flags=0<> mtu 1280 en5: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether ac:de:48:00:11:22 inet6 fe80::aede:48ff:fe00:1122%en5 prefixlen 64 scopeid 0x4 nd6 options=201<PERFORMNUD,DAD> media: autoselect status: active en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 options=400<CHANNEL_IO> ether 78:4f:43:5e:b9:86 inet6 fe80::1c4b:d303:b374:c2f3%en0 prefixlen 64 secured scopeid 0x5 inet6 fd00:1cab:c0ac:fc82:80e:f701:8302:6287 prefixlen 64 autoconf secured inet6 fd00:1cab:c0ac:fc82:1c38:9f17:2073:8eb prefixlen 64 autoconf temporary inet 192.168.0.11 netmask 0xffffff00 broadcast 192.168.0.255 nd6 options=201<PERFORMNUD,DAD> media: autoselect status: active en3: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 options=460<TSO4,TSO6,CHANNEL_IO> ether 82:46:1a:46:5c:01 media: autoselect <full-duplex> status: inactive en1: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 options=460<TSO4,TSO6,CHANNEL_IO> ether 82:46:1a:46:5c:00 media: autoselect <full-duplex> status: inactive en4: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 options=460<TSO4,TSO6,CHANNEL_IO> ether 82:46:1a:46:5c:05 media: autoselect <full-duplex> status: inactive en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 options=460<TSO4,TSO6,CHANNEL_IO> ether 82:46:1a:46:5c:04 media: autoselect <full-duplex> status: inactive bridge0: flags=8822<BROADCAST,SMART,SIMPLEX,MULTICAST> mtu 1500 options=63<RXCSUM,TXCSUM,TSO4,TSO6> ether 82:46:1a:46:5c:00 Configuration: id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0 maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200 root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0 ipfilter disabled flags 0x2 member: en1 flags=3<LEARNING,DISCOVER> ifmaxaddr 0 port 7 priority 0 path cost 0 member: en2 flags=3<LEARNING,DISCOVER> ifmaxaddr 0 port 9 priority 0 path cost 0 member: en3 flags=3<LEARNING,DISCOVER> ifmaxaddr 0 port 6 priority 0 path cost 0 member: en4 flags=3<LEARNING,DISCOVER> ifmaxaddr 0 port 8 priority 0 path cost 0 media: <unknown type> status: inactive p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304 options=400<CHANNEL_IO> ether 0a:4f:43:5e:b9:86 media: autoselect status: inactive awdl0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1484 options=400<CHANNEL_IO> ether f6:38:1e:e0:6c:3f inet6 fe80::f438:1eff:fee0:6c3f%awdl0 prefixlen 64 scopeid 0xc nd6 options=201<PERFORMNUD,DAD> media: autoselect status: active llw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 options=400<CHANNEL_IO> ether f6:38:1e:e0:6c:3f inet6 fe80::f438:1eff:fee0:6c3f%llw0 prefixlen 64 scopeid 0xd nd6 options=201<PERFORMNUD,DAD> media: autoselect status: active utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380 inet6 fe80::afc9:f21a:4d82:2c8d%utun0 prefixlen 64 scopeid 0xe nd6 options=201<PERFORMNUD,DAD> utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000 inet6 fe80::4b52:18b4:5f46:4edf%utun1 prefixlen 64 scopeid 0xf nd6 options=201<PERFORMNUD,DAD> ---------- components: macOS messages: 375387 nosy: ned.deily, ronaldoussoren, terrygreeniaus priority: normal severity: normal status: open title: uuid.uuid1() on macOS doesn't generate unique IDs type: behavior versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue41552> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com