gh-156939: Fix memory corruption check in fcntl - #157103

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vstinner:fcntl_canary

Commits on Sep 7, 2026

gh-156939: Fix buffer overflow in fcntl
vstinner
committed
6627b40
Replace canary byte with guard bytes
vstinner
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d90a253
Update comment
vstinner
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db05828
Fix typo
vstinner
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c303c1e