kopia lustrzana https://github.com/micropython/micropython
tests/cpydiff: Add a note about risk of resizing memoryview targets.
This a stop-gap until there is a proper fix for this. This work was funded through GitHub Sponsors. Signed-off-by: Angus Gratton <angus@redyak.com.au>pull/14029/head
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"""
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categories: Types,memoryview
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description: memoryview can become invalid if its target is resized
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cause: CPython prevents a ``bytearray`` or ``io.bytesIO`` object from changing size while there is a ``memoryview`` object that references it. MicroPython requires the programmer to manually ensure that an object is not resized while any ``memoryview`` references it.
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In the worst case scenario, resizing an object which is the target of a memoryview can cause the memoryview(s) to reference invalid freed memory (a use-after-free bug) and corrupt the MicroPython runtime.
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workaround: Do not change the size of any ``bytearray`` or ``io.bytesIO`` object that has a ``memoryview`` assigned to it.
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"""
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b = bytearray(b"abcdefg")
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m = memoryview(b)
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b.extend(b"hijklmnop")
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print(b, bytes(m))
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