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GeezerVison is showing github.com — gh-159739: Detect recursive untyped ctypes arguments by jelle-openai · Pull Request #160194 · python/cpython

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@jelle-openai

@jelle-openai jelle-openai commented Oct 22, 2026 •
edited by bedevere-app Bot
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as_parameter chains were recursion-checked for typed arguments but not for foreign calls without argtypes. A cyclic chain could exhaust the C stack and crash before the function was called. Apply the same recursion guard to untyped conversion. Backport to 3.15 and 3.14.

  • Issue: Fix minor safety issues #159739

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@jelle-openai
pythongh-159739: Detect recursive untyped ctypes arguments
0458f32 
_as_parameter_ chains were recursion-checked for typed arguments but not for foreign calls without argtypes. A cyclic chain could exhaust the C stack and crash before the function was called. Apply the same recursion guard to untyped conversion. Backport to 3.15 and 3.14.
@bedevere-app bedevere-app Bot added the awaiting review label Oct 22, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Oct 22, 2026
Fix minor safety issues #159739
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@JelleZijlstra
JelleZijlstra merged commit 3e19e04 into python:main Oct 22, 2026
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@JelleZijlstra JelleZijlstra added needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Oct 22, 2026
@miss-islington-app

miss-islington-app Bot commented Oct 22, 2026

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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15.
🐍🍒⛏🤖
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@bedevere-app bedevere-app Bot removed the awaiting review label Oct 22, 2026
@miss-islington-app

miss-islington-app Bot commented Oct 22, 2026

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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖
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@miss-islington-app

miss-islington-app Bot commented Oct 22, 2026

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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.15.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!
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miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Oct 22, 2026
@jelle-openai @miss-islington
pythongh-159739: Detect recursive untyped ctypes arguments (pythonGH-…
adfdf5b 
…160194)

_as_parameter_ chains were recursion-checked for typed arguments but not for foreign calls without argtypes. A cyclic chain could exhaust the C stack and crash before the function was called. Apply the same recursion guard to untyped conversion. Backport to 3.15 and 3.14.
(cherry picked from commit 3e19e04)

Co-authored-by: Jelle Zijlstra <[email protected]>
@bedevere-app

bedevere-app Bot commented Oct 22, 2026

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GH-160350 is a backport of this pull request to the 3.15 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Oct 22, 2026
@bedevere-app

bedevere-app Bot commented Oct 22, 2026

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GH-160351 is a backport of this pull request to the 3.14 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Oct 22, 2026
@miss-islington-app

miss-islington-app Bot commented Oct 22, 2026

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Sorry @jelle-openai and @JelleZijlstra, I had trouble completing the backport.

Please retry by removing and re-adding the "needs backport to 3.14" label.
If that does not work, please backport manually with cherry_picker, see the devguide for more information.

cherry_picker 3e19e0408d9791c235c6c85818de1b9b2eb93dfa 3.14
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@miss-islington-app miss-islington-app Bot assigned JelleZijlstra Oct 22, 2026
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Oct 22, 2026
@jelle-openai @miss-islington
pythongh-159739: Detect recursive untyped ctypes arguments (pythonGH-…
f9f5fa6 
…160194)

_as_parameter_ chains were recursion-checked for typed arguments but not for foreign calls without argtypes. A cyclic chain could exhaust the C stack and crash before the function was called. Apply the same recursion guard to untyped conversion. Backport to 3.15 and 3.14.
(cherry picked from commit 3e19e04)

Co-authored-by: Jelle Zijlstra <[email protected]>
@miss-islington-app

miss-islington-app Bot commented Oct 22, 2026

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Sorry @jelle-openai and @JelleZijlstra, I had trouble completing the backport.

Please retry by removing and re-adding the "needs backport to 3.15" label.
If that does not work, please backport manually with cherry_picker, see the devguide for more information.

cherry_picker 3e19e0408d9791c235c6c85818de1b9b2eb93dfa 3.15
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JelleZijlstra pushed a commit that referenced this pull request Oct 22, 2026
@miss-islington @jelle-openai
[3.14] gh-159739: Detect recursive untyped ctypes arguments (GH-160194)…
e083505 
… (#160351)

_as_parameter_ chains were recursion-checked for typed arguments but not for foreign calls without argtypes. A cyclic chain could exhaust the C stack and crash before the function was called. Apply the same recursion guard to untyped conversion. Backport to 3.15 and 3.14.
(cherry picked from commit 3e19e04)

Co-authored-by: Jelle Zijlstra <[email protected]>
JelleZijlstra pushed a commit that referenced this pull request Oct 23, 2026
@miss-islington @jelle-openai
[3.15] gh-159739: Detect recursive untyped ctypes arguments (GH-160194)…
6dddf0b 
… (#160350)

_as_parameter_ chains were recursion-checked for typed arguments but not for foreign calls without argtypes. A cyclic chain could exhaust the C stack and crash before the function was called. Apply the same recursion guard to untyped conversion. Backport to 3.15 and 3.14.
(cherry picked from commit 3e19e04)

Co-authored-by: Jelle Zijlstra <[email protected]>
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@jelle-openai @JelleZijlstra
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