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gh-42400: Fix buffer overflow in _Py_wrealpath for long paths - #141529
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Allow platforms where realpath returns different canonical paths (e.g. Android). Verify resolution with os.samefile and fall back to a length check if samefile is unavailable.
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@vstinner Could you please review this PR? |
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…qB5Kq.rst Co-authored-by: Victor Stinner <vstinner@python.org>
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I updated the PR to retrieve the fix for the UBSan CI. |
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🤖 New build scheduled with the buildbot fleet by @vstinner for commit f882e26 🤖 Results will be shown at: https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F141529%2Fmerge If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again. |
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…paths (python#141529) Co-authored-by: Victor Stinner <vstinner@python.org>
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Fixes buffer overflow (CVE-2006-1542) in
_Py_wrealpath()when handling paths longer than MAXPATHLEN (4096 bytes).Changed
realpath(path, buffer)torealpath(path, NULL)for dynamic allocation.Closes #42400
realpath#42400