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[3.13] gh-130655: Add a test for bad magic numbers in .mo files parsed by gettext (GH-131909) (#132077)

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gh-130655: Add a test for bad magic numbers in `.mo` files parsed by `gettext` (GH-131909)
(cherry picked from commit 16a6270aa6)

Co-authored-by: Tomas R <tomas.roun8@gmail.com>
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Miss Islington (bot) 2025-04-04 16:49:31 +02:00 • committed by GitHub
parent 093c587388
commit 2c05ebd163
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1 changed files with 16 additions and 0 deletions
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16
Lib/test/test_gettext.py
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@ -39,6 +39,9 @@ cyBmaWNoZXJvcyAoY29udGV4dCkAYmFjb24Ad2luayB3aW5rIChpbiAibXkgY29udGV4dCIpAHdp
bmsgd2luayAoaW4gIm15IG90aGVyIGNvbnRleHQiKQB3aW5rIHdpbmsA
'''
# .mo file with an invalid magic number
GNU_MO_DATA_BAD_MAGIC_NUMBER = base64.b64encode(b'ABCD')
# This data contains an invalid major version number (5)
# An unexpected major version number should be treated as an error when
# parsing a .mo file
@ -111,6 +114,7 @@ bGUKR2VuZXJhdGVkLUJ5OiBweWdldHRleHQucHkgMS4zCgA=
LOCALEDIR = os.path.join('xx', 'LC_MESSAGES')
MOFILE = os.path.join(LOCALEDIR, 'gettext.mo')
MOFILE_BAD_MAGIC_NUMBER = os.path.join(LOCALEDIR, 'gettext_bad_magic_number.mo')
MOFILE_BAD_MAJOR_VERSION = os.path.join(LOCALEDIR, 'gettext_bad_major_version.mo')
MOFILE_BAD_MINOR_VERSION = os.path.join(LOCALEDIR, 'gettext_bad_minor_version.mo')
UMOFILE = os.path.join(LOCALEDIR, 'ugettext.mo')
@ -131,6 +135,8 @@ class GettextBaseTest(unittest.TestCase):
os.makedirs(LOCALEDIR)
with open(MOFILE, 'wb') as fp:
fp.write(base64.decodebytes(GNU_MO_DATA))
with open(MOFILE_BAD_MAGIC_NUMBER, 'wb') as fp:
fp.write(base64.decodebytes(GNU_MO_DATA_BAD_MAGIC_NUMBER))
with open(MOFILE_BAD_MAJOR_VERSION, 'wb') as fp:
fp.write(base64.decodebytes(GNU_MO_DATA_BAD_MAJOR_VERSION))
with open(MOFILE_BAD_MINOR_VERSION, 'wb') as fp:
@ -249,6 +255,16 @@ class GettextTestCase2(GettextBaseTest):
def test_textdomain(self):
self.assertEqual(gettext.textdomain(), 'gettext')
def test_bad_magic_number(self):
with open(MOFILE_BAD_MAGIC_NUMBER, 'rb') as fp:
with self.assertRaises(OSError) as cm:
gettext.GNUTranslations(fp)
exception = cm.exception
self.assertEqual(exception.errno, 0)
self.assertEqual(exception.strerror, "Bad magic number")
self.assertEqual(exception.filename, MOFILE_BAD_MAGIC_NUMBER)
def test_bad_major_version(self):
with open(MOFILE_BAD_MAJOR_VERSION, 'rb') as fp:
with self.assertRaises(OSError) as cm: