posixmodule: fd_and_follow_symlinks_invalid lets fd be 0 #144023

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posixmodule: fd_and_follow_symlinks_invalid lets fd be 0#144023

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extension-modulesC modules in the Modules dirC modules in the Modules dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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SiliconA-Z

opened on Jan 19, 2026

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Bug description:

fd_and_follow_symlinks_invalid does not trigger an error is fd is 0 and followsymlinks is false

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

Linked PRs

• gh-144023: prevent follow_symlinks from being allowed with an fd of 0 #144022
• [3.14] gh-144023: Prevent follow_symlinks from being allowed with an fd of 0 (GH-144022) #144151
• [3.13] gh-144023: Prevent follow_symlinks from being allowed with an fd of 0 (GH-144022) #144152

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extension-modulesC modules in the Modules dirC modules in the Modules dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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