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[3.12] gh-130655: Add a test for corrupt.mo files ingettext (GH-131911)#132080

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Merged
picnixz merged 1 commit intopython:3.12frommiss-islington:backport-a126cef-3.12
Apr 4, 2025
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39 changes: 39 additions & 0 deletionsLib/test/test_gettext.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -87,6 +87,32 @@
ciBUQUgKdHJnZ3JrZyB6cmZmbnRyIHBuZ255YnQgeXZvZW5lbC4AYmFjb24Ad2luayB3aW5rAA==
'''

# Corrupt .mo file
# Generated from
#
# msgid "foo"
# msgstr "bar"
#
# with msgfmt --no-hash
#
# The translation offset is changed to 0xFFFFFFFF,
# making it larger than the file size, which should
# raise an error when parsing.
GNU_MO_DATA_CORRUPT = base64.b64encode(bytes([
0xDE, 0x12, 0x04, 0x95, # Magic
0x00, 0x00, 0x00, 0x00, # Version
0x01, 0x00, 0x00, 0x00, # Message count
0x1C, 0x00, 0x00, 0x00, # Message offset
0x24, 0x00, 0x00, 0x00, # Translation offset
0x00, 0x00, 0x00, 0x00, # Hash table size
0x2C, 0x00, 0x00, 0x00, # Hash table offset
0x03, 0x00, 0x00, 0x00, # 1st message length
0x2C, 0x00, 0x00, 0x00, # 1st message offset
0x03, 0x00, 0x00, 0x00, # 1st trans length
0xFF, 0xFF, 0xFF, 0xFF, # 1st trans offset (Modified to make it invalid)
0x66, 0x6F, 0x6F, 0x00, # Message data
0x62, 0x61, 0x72, 0x00, # Message data
]))

UMO_DATA = b'''\
3hIElQAAAAADAAAAHAAAADQAAAAAAAAAAAAAAAAAAABMAAAABAAAAE0AAAAQAAAAUgAAAA8BAABj
Expand All@@ -113,6 +139,7 @@
MOFILE = os.path.join(LOCALEDIR, 'gettext.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')
MOFILE_CORRUPT = os.path.join(LOCALEDIR, 'gettext_corrupt.mo')
UMOFILE = os.path.join(LOCALEDIR, 'ugettext.mo')
MMOFILE = os.path.join(LOCALEDIR, 'metadata.mo')

Expand All@@ -135,6 +162,8 @@ def setUpClass(cls):
fp.write(base64.decodebytes(GNU_MO_DATA_BAD_MAJOR_VERSION))
with open(MOFILE_BAD_MINOR_VERSION, 'wb') as fp:
fp.write(base64.decodebytes(GNU_MO_DATA_BAD_MINOR_VERSION))
with open(MOFILE_CORRUPT, 'wb') as fp:
fp.write(base64.decodebytes(GNU_MO_DATA_CORRUPT))
with open(UMOFILE, 'wb') as fp:
fp.write(base64.decodebytes(UMO_DATA))
with open(MMOFILE, 'wb') as fp:
Expand DownExpand Up@@ -264,6 +293,16 @@ def test_bad_minor_version(self):
# Check that no error is thrown with a bad minor version number
gettext.GNUTranslations(fp)

def test_corrupt_file(self):
with open(MOFILE_CORRUPT, 'rb') as fp:
with self.assertRaises(OSError) as cm:
gettext.GNUTranslations(fp)

exception = cm.exception
self.assertEqual(exception.errno, 0)
self.assertEqual(exception.strerror, "File is corrupt")
self.assertEqual(exception.filename, MOFILE_CORRUPT)

def test_some_translations(self):
eq = self.assertEqual
# test some translations
Expand Down
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