gh-96819: check if the length of a pipe write is not greater than 512 by saito828koki · Pull Request #96890 · python/cpython

saito828koki · 2022-09-17T13:02:46Z

Issue: Multiprocessing resource tracker incorrectly checks pipe write length #96819

bedevere-bot · 2022-09-17T13:02:49Z

Most changes to Python require a NEWS entry.

Please add it using the blurb_it web app or the blurb command-line tool.

DanielNoord · 2022-09-19T21:47:11Z

Lib/multiprocessing/resource_tracker.py

+        if len(msg) > 512:
            # posix guarantees that writes to a pipe of less than PIPE_BUF
            # bytes are atomic, and that PIPE_BUF >= 512
            raise ValueError('name too long')


Shouldn't this also be updated? ie. msg too long?

@DanielNoord
Thanks for your comment!
The error message should also be updated. I will fix it.

DanielNoord · 2022-09-20T07:39:00Z

Misc/NEWS.d/next/Library/2022-09-17-13-15-10.gh-issue-96819.6RfqM7.rst

@@ -0,0 +1 @@
+Fixed the block to guarantee that the length of a write to a pipe is not greater than PIPE_BUF


Suggested change

Fixed the block to guarantee that the length of a write to a pipe is not greater than PIPE_BUF

Fixed the check that guarantees that the length of a write to a pipe is not greater than PIPE_BUF

Thank you for correcting my English! Your suggestion seems to be great.

No worries! I struggle with writing good and short changelog entries myself many times! 😄

JelleZijlstra · 2022-09-30T03:44:48Z

Is it possible to write a unit test for this change?

saito828koki · 2022-10-01T12:35:47Z

Hello @JelleZijlstra ,

Thanks for your comment.
I added a test for this change. Could you review this PR?

kumaraditya303 · 2022-10-01T17:19:29Z

Misc/NEWS.d/next/Library/2022-09-17-13-15-10.gh-issue-96819.6RfqM7.rst

@@ -0,0 +1 @@
+Fixed the check that guarantees that the length of a write to a pipe is not greater than PIPE_BUF


Mention multiprocessing.resource_tracker in news.

Misc/NEWS.d/next/Library/2022-09-17-13-15-10.gh-issue-96819.6RfqM7.rst

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>

miss-islington · 2022-10-03T00:41:04Z

Thanks @saito828koki for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.10, 3.11.
🐍🍒⛏🤖

bedevere-bot · 2022-10-03T00:41:15Z

GH-97745 is a backport of this pull request to the 3.11 branch.

…pipe write <= 512 (pythonGH-96890) Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com> (cherry picked from commit 19ca114) Co-authored-by: Koki Saito <49419225+saito828koki@users.noreply.github.com>

bedevere-bot · 2022-10-03T00:41:20Z

GH-97746 is a backport of this pull request to the 3.10 branch.

…pipe write <= 512 (pythonGH-96890) Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com> (cherry picked from commit 19ca114) Co-authored-by: Koki Saito <49419225+saito828koki@users.noreply.github.com>

…rite <= 512 (GH-96890) Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com> (cherry picked from commit 19ca114) Co-authored-by: Koki Saito <49419225+saito828koki@users.noreply.github.com>

* main: (2069 commits) pythongh-96512: Move int_max_str_digits setting to PyConfig (python#96944) pythongh-94808: Coverage: Check picklablability of calliter (python#95923) pythongh-94808: Add test coverage for PyObject_HasAttrString (python#96627) pythongh-94732: Fix KeyboardInterrupt race in asyncio run_forever() (python#97765) Fix typos in `bltinmodule.c`. (pythonGH-97766) pythongh-94808: `_PyLineTable_StartsLine` was not used (pythonGH-96609) pythongh-97681: Remove Tools/demo/ directory (python#97682) Fix typo in unittest docs (python#97742) pythongh-97728: Argument Clinic: Fix uninitialized variable in the Py_UNICODE converter (pythonGH-97729) pythongh-95913: Fix PEP number in PEP 678 What's New ref label (python#97739) pythongh-95913: Copyedit/improve New Modules What's New section (python#97721) pythongh-97740: Fix bang in Sphinx C domain ref target syntax (python#97741) pythongh-96819: multiprocessing.resource_tracker: check if length of pipe write <= 512 (python#96890) pythongh-97706: multiprocessing tests: Delete unused variable `rand` (python#97707) pythonGH-85447: Clarify docs about awaiting future multiple times (python#97738) [docs] Update logging cookbook with recipe for using a logger like an output… (pythonGH-97730) pythongh-97607: Fix content parsing in the impl-detail reST directive (python#97652) pythongh-95975: Move except/*/finally ref labels to more precise locations (python#95976) pythongh-97591: In `Exception.__setstate__()` acquire strong references before calling `tp_hash` slot (python#97700) pythongh-95588: Drop the safety claim from `ast.literal_eval` docs. (python#95919) ...

fix: check the length of msg, not the length of name

2efc372

bedevere-bot added the awaiting review label Sep 17, 2022

blurb-it bot and others added 2 commits September 17, 2022 13:15

📜🤖 Added by blurb_it.

476bed0

fix: remove backticks

ee548f9

DanielNoord reviewed Sep 19, 2022

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fix: update error message

1566b72

DanielNoord approved these changes Sep 20, 2022

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bedevere-bot added awaiting core review and removed awaiting review labels Sep 20, 2022

modify NEWS entry

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Add a test for too long name resources

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kumaraditya303 requested changes Oct 1, 2022

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kumaraditya303 added type-bug An unexpected behavior, bug, or error needs backport to 3.10 only security fixes needs backport to 3.11 only security fixes labels Oct 1, 2022

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Misc/NEWS.d/next/Library/2022-09-17-13-15-10.gh-issue-96819.6RfqM7.rst Outdated Show resolved Hide resolved

kumaraditya303 approved these changes Oct 1, 2022

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Modify NEWS entry

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Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>

kumaraditya303 requested a review from JelleZijlstra October 1, 2022 18:04

JelleZijlstra approved these changes Oct 3, 2022

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bedevere-bot added awaiting merge and removed awaiting core review labels Oct 3, 2022

JelleZijlstra merged commit 19ca114 into python:main Oct 3, 2022

bedevere-bot removed the awaiting merge label Oct 3, 2022

bedevere-bot removed the needs backport to 3.11 only security fixes label Oct 3, 2022

bedevere-bot removed the needs backport to 3.10 only security fixes label Oct 3, 2022

		@@ -0,0 +1 @@
		Fixed the block to guarantee that the length of a write to a pipe is not greater than PIPE_BUF

	Fixed the block to guarantee that the length of a write to a pipe is not greater than PIPE_BUF
	Fixed the check that guarantees that the length of a write to a pipe is not greater than PIPE_BUF

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saito828koki commented Sep 17, 2022 •

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