Message 324813 - Python tracker

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Author	deltaclock
Recipients	deltaclock
Date	2018-09-07.23:43:37
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1536363817.94.0.56676864532.issue34610@psf.upfronthosting.co.za>
In-reply-to

Content
The manager class of the multiprocessing module doesnt implement __next__ or __iter__ on its dictionary method and relies on using __getitem__. This results in an unexpected functionality of an object that is supposed to act like a dict, and instead of looping over the dictionary keys it loops over its values. The user needs to call dict() on this object in order to loop over it correctly, which is not that obvious. The problem originates from there https://github.com/python/cpython/blob/master/Lib/multiprocessing/managers.py#L1136 Poc link: https://hastebin.com/codoqihowi.py

The manager class of the multiprocessing module doesnt implement __next__ or __iter__ on its dictionary method and relies on using __getitem__.

This results in an unexpected functionality of an object that is supposed to act like a dict, and instead of looping over the dictionary keys it loops over its values.

The user needs to call dict() on this object in order to loop over it correctly, which is not that obvious.

The problem originates from there https://github.com/python/cpython/blob/master/Lib/multiprocessing/managers.py#L1136

Poc link: https://hastebin.com/codoqihowi.py

History
Date	User	Action	Args
2018-09-07 23:43:37	deltaclock	set	recipients: + deltaclock
2018-09-07 23:43:37	deltaclock	set	messageid: <1536363817.94.0.56676864532.issue34610@psf.upfronthosting.co.za>
2018-09-07 23:43:37	deltaclock	link	issue34610 messages
2018-09-07 23:43:37	deltaclock	create