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bpo-47151: Fallback to fork when vfork fails in subprocess. #32186

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Merged
merged 5 commits into from
Mar 31, 2022
Merged

bpo-47151: Fallback to fork when vfork fails in subprocess. #32186

merged 5 commits into from
Mar 31, 2022

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gpshead
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@gpshead gpshead commented Mar 30, 2022 •
edited by bedevere-bot
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vfork() can return -1 and set errno. We now fall back to fork() in that situation as one possible error is EINVAL indicating that the kernel doesn't permit vfork from the current process. See the bug.

https://bugs.python.org/issue47151

@gpshead gpshead added type-bug An unexpected behavior, bug, or error needs backport to 3.9 only security fixes needs backport to 3.10 only security fixes labels Mar 30, 2022
@gpshead gpshead marked this pull request as ready for review March 30, 2022 01:30
@gpshead gpshead requested a review from vstinner March 30, 2022 01:36
corona10
corona10 approved these changes Mar 30, 2022
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lgtm :) Nice solution

vstinner
vstinner approved these changes Mar 31, 2022
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LGTM.

@gpshead gpshead merged commit 4a08c4c into python:main Mar 31, 2022
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Thanks @gpshead for the PR 🌮🎉.. I'm working now to backport this PR to: 3.9, 3.10.
🐍🍒⛏🤖

@gpshead gpshead deleted the subprocess-vfork-fail branch March 31, 2022 20:42
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Sorry, @gpshead, I could not cleanly backport this to 3.9 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker 4a08c4c469d36f99d3a5e0f17ad82ab35dcf2835 3.9

@bedevere-bot bedevere-bot removed the needs backport to 3.10 only security fixes label Mar 31, 2022
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GH-32219 is a backport of this pull request to the 3.10 branch.

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Mar 31, 2022
@gpshead @miss-islington
bpo-47151: Fallback to fork when vfork fails in subprocess. (pythonGH…
cbc9705 
…-32186)

bpo-47151: Fallback to fork when vfork fails in subprocess. An OS kernel can specifically decide to disallow vfork() in a process. No need for that to prevent us from launching subprocesses.
(cherry picked from commit 4a08c4c)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
@gpshead gpshead removed the needs backport to 3.9 only security fixes label Mar 31, 2022
miss-islington added a commit that referenced this pull request Mar 31, 2022
@miss-islington @gpshead
bpo-47151: Fallback to fork when vfork fails in subprocess. (GH-32186)
9ed179b 
bpo-47151: Fallback to fork when vfork fails in subprocess. An OS kernel can specifically decide to disallow vfork() in a process. No need for that to prevent us from launching subprocesses.
(cherry picked from commit 4a08c4c)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
@socketpair socketpair mannequin mentioned this pull request May 1, 2022
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