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[3.13] gh-143309: fix UAF in `os.execve` when the environment is concurrently mutated (GH-143314)
(cherry picked from commit 9609574e7fd36edfaa8b575558a82cc14e65bfbc)
Co-authored-by: Bénédikt Tran [email protected]
- Issue: gh-143309
I forgot that the auto-dedentation feature wasn't available in 3.13...
I'm going to do it myself tomorrow so that I can include the build bot fixes directly.