https://github.com/python/cpython/commit/a126cefc176a7ddbd1a09ce560195f6fd81a5c92
commit: a126cefc176a7ddbd1a09ce560195f6fd81a5c92
branch: main
author: Tomas R. <tomas.ro...@gmail.com>
committer: picnixz <10796600+picn...@users.noreply.github.com>
date: 2025-04-04T13:26:59Z
summary:
gh-130655: Add a test for corrupt `.mo` files in `gettext` (#131911)
files:
M Lib/test/test_gettext.py
diff --git a/Lib/test/test_gettext.py b/Lib/test/test_gettext.py
index 87a77aab19336e..d2f18f1dfede77 100644
--- a/Lib/test/test_gettext.py
+++ b/Lib/test/test_gettext.py
@@ -88,6 +88,32 @@
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
@@ -115,6 +141,7 @@
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')
+MOFILE_CORRUPT = os.path.join(LOCALEDIR, 'gettext_corrupt.mo')
UMOFILE = os.path.join(LOCALEDIR, 'ugettext.mo')
MMOFILE = os.path.join(LOCALEDIR, 'metadata.mo')
@@ -139,6 +166,8 @@ 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:
@@ -254,6 +283,16 @@ 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
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