[issue32904] os.chdir() may crash on Windows in presence of races

[Alexey Izbyshev]

Change by Alexey Izbyshev :


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keywords: +patch
pull_requests: +5580
stage:  -> patch review

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[issue32904] os.chdir() may crash on Windows in presence of races

[Alexey Izbyshev]

New submission from Alexey Izbyshev :

win32_wchdir() retries GetCurrentDirectory() with a larger buffer if necessary, 
but doesn't check whether the new buffer is large enough. Another thread could 
change the current directory in meanwhile, so the buffer could turn out to be 
still not large enough, left in an uninitialized state and passed to 
SetEnvironmentVariable() afterwards.

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components: Extension Modules, Windows
messages: 312524
nosy: izbyshev, paul.moore, steve.dower, tim.golden, vstinner, zach.ware
priority: normal
severity: normal
status: open
title: os.chdir() may crash on Windows in presence of races
type: crash
versions: Python 2.7, Python 3.6, Python 3.7

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