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Resizing an anonymous mmap can lead to crash #138204
Description
Crash report
>>> import mmap
>>> m = mmap.mmap(-1, mmap.PAGESIZE)
>>> m.resize(2 * mmap.PAGESIZE)
>>> m[:]
Bus error (core dumped)Tested on Linux.
{{ message }}
>>> import mmap
>>> m = mmap.mmap(-1, mmap.PAGESIZE)
>>> m.resize(2 * mmap.PAGESIZE)
>>> m[:]
Bus error (core dumped)Tested on Linux.
Activity
serhiy-storchaka commentedon Aug 27, 2025
Does not crash on Windows.
On *BSD and OpenIndiana resizing is not implemented.
YvesDup commentedon Aug 27, 2025
Does not crash on MacOSX 15.1, m4 pro. Raises a
SystemErrorserhiy-storchaka commentedon Aug 28, 2025
This is a known bug in Linux: https://bugzilla.kernel.org/show_bug.cgi?id=8691.
pythongh-138204: Forbid expansion of a shared anonymous mmap on Linux
gh-138204: Forbid expansion of a shared anonymous mmap on Linux (GH-1…
pythongh-138204: Forbid expansion of a shared anonymous mmap on Linux (…
pythongh-138204: Forbid expansion of a shared anonymous mmap on Linux (…
[3.13] gh-138204: Forbid expansion of a shared anonymous mmap on Linux (
pythongh-138204: Forbid expansion of a shared anonymous mmap on Linux (…
[3.14] gh-138204: Forbid expansion of a shared anonymous mmap on Linux (