[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Benjamin Peterson]

Benjamin Peterson  added the comment:


New changeset d919c60e6936f853ad15040017f2c0bce0f027f8 by Benjamin Peterson 
(Chih-Hsuan Yen) in branch '2.7':
[2.7] bpo-32502: Discard 64-bit (and other invalid) hardware addresses (GH-9125)
https://github.com/python/cpython/commit/d919c60e6936f853ad15040017f2c0bce0f027f8


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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Chih-Hsuan Yen]

Chih-Hsuan Yen  added the comment:

I created the backport PR for 2.7 branch. Can anyone reopen this issue?

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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Chih-Hsuan Yen]

Change by Chih-Hsuan Yen :


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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Chih-Hsuan Yen]

Chih-Hsuan Yen  added the comment:

Could the fix be backported to 2.7 branch? Apparently on macOS 2.7 is also 
affected https://github.com/macports/macports-ports/pull/2456

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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Barry A. Warsaw]

Change by Barry A. Warsaw :


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.7

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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Barry A. Warsaw]

Barry A. Warsaw  added the comment:


New changeset d69794f4df81de731cc66dc82136e28bee691e1e by Barry Warsaw (Bo 
Bayles) in branch '3.6':
[3.6] bpo-32502: Discard 64-bit (and other invalid) hardware addresses 
(GH-5254) (#5290)
https://github.com/python/cpython/commit/d69794f4df81de731cc66dc82136e28bee691e1e


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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[bbayles]

Change by bbayles :


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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Barry A. Warsaw]

Barry A. Warsaw  added the comment:


New changeset 6b273f7f4056f8276f61a97c789d6bb4425e653c by Barry Warsaw (Bo 
Bayles) in branch 'master':
bpo-32502: Discard 64-bit (and other invalid) hardware addresses (#5254)
https://github.com/python/cpython/commit/6b273f7f4056f8276f61a97c789d6bb4425e653c


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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[bbayles]

Change by bbayles :


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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[bbayles]

Change by bbayles :


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pull_requests: +5101
stage: needs patch -> patch review

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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Andres Petralli]

Andres Petralli  added the comment:

Re: rarity. There is at least one more person that ran into the same issue as 
seen in this report: https://github.com/Azure/azure-cli/issues/5184

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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Andres Petralli]

Andres Petralli  added the comment:

Moving doesn't work, but even removing the firewire adapter (which was unused 
on my system), doesn't remove it from the output of ifconfig.

I did however work around the issue by just patching up uuid in a suboptimal 
manner (truncated the 64bit int to 48bit).

A proper fix would probably need to discard EUI-64 addresses and look for 
EUI-48 specifically.

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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Ned Deily]

Ned Deily  added the comment:

(As a workaround, you *might* be able to reorder the network interfaces in the 
System Preferences -> Network control panel.)

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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Andres Petralli]

Andres Petralli  added the comment:

This could be purely incidental to have shown up in 10.13, but yes, the problem 
comes from the fact that the first hardware ID in the list of devices happens 
to be an EUI-64 address with 64 bits now. This is the Firewire interface of my 
Mac Pro and maybe one of the few that actually uses a EUI-64 addresses, hence 
relatively rare. Maybe the order changed in 10.13 and this now happens to be 
the first entry returned from 'ifconfig' when previously maybe it was the 
Ethernet adapter, but given the lookup algorithm in uuid reads in line by line 
until it finds the first hw id, this is bound to fail on my machine. Clearly, I 
don't think uuid should make assumptions about order of interfaces that could 
have mixed EUI-48 and EUI-64 addresses.

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[issue32502] uuid1() fails if only 64-bit interface addresses are available

[Ned Deily]

Ned Deily  added the comment:

Thanks for your additional analysis.  So, assuming I understand it correctly, 
the problem here is that there can be hardware configurations where the only 
(or first?) hardware addresses available exceed 48 bits.  I'm not sure what 
might be different for your system when running 10.13, assuming uuid1() used to 
work on earlier versions of macOS; perhaps another network interface with a 
smaller address was supported and configured?  It seems like such 
configurations are pretty rare; there don't seem to be any prior bug reports on 
this and it would be unusual for Mac systems to only have a Firewire 
(non-loopback) network interface configured.  In any case, such configurations 
presumably are not limited to Macs so I'm removing the macOS tag.

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components: +Library (Lib) -macOS
nosy:  -ronaldoussoren
stage:  -> needs patch
title: uuid1() broken on macos high sierra -> uuid1() fails if only 64-bit 
interface addresses are available

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