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[3.13] gh-125118: don't copy arbitrary values to _Bool in the struct module (GH-125169) (#125263)

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memcopy'ing arbitrary values to _Bool variable triggers undefined
behaviour. Avoid this.
We assume that `false` is represented by all zero bytes.

Credits to Alex Gaynor.

(cherry picked from commit 87d7315ac5)

Co-authored-by: Sam Gross <colesbury@gmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
This commit is contained in:
Sergey B Kirpichev 2024-10-10 17:58:57 +03:00 • committed by GitHub
parent 0c43d60e7d
commit c2cb1a89b7
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3 changed files with 6 additions and 3 deletions
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Lib/test/test_struct.py
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@ -529,6 +529,9 @@ def __bool__(self):
for c in [b'\x01', b'\x7f', b'\xff', b'\x0f', b'\xf0']:
self.assertTrue(struct.unpack('>?', c)[0])
self.assertTrue(struct.unpack('<?', c)[0])
self.assertTrue(struct.unpack('=?', c)[0])
self.assertTrue(struct.unpack('@?', c)[0])
def test_count_overflow(self):
hugecount = '{}b'.format(sys.maxsize+1)