8000 [3.12] gh-135034: Normalize link targets in tarfile, add `os.path.realpath(strict='allow_missing')` (GH-135037) by Yhg1s · Pull Request #135066 · python/cpython · GitHub
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[3.12] gh-135034: Normalize link targets in tarfile, add os.path.realpath(strict='allow_missing') (GH-135037) #135066

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Merged
merged 10 commits into from
Jun 3, 2025
Merged

[3.12] gh-135034: Normalize link targets in tarfile, add os.path.realpath(strict='allow_missing') (GH-135037) #135066

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c358142
[3.12] gh-135034: Normalize link targets in tarfile, add `os.path.rea…
ambv Jun 3, 2025
3c10cf0
Fix merge snafu
Yhg1s Jun 3, 2025
f5f9555
Fix test failure in test_tarfile
Yhg1s Jun 3, 2025
2b5673e
Drop backport of extra tests that don't really address security conce…
Yhg1s Jun 3, 2025
70f9db5
Fix a few tests, and a glaring logic error in the posixpath backport.
Yhg1s Jun 3, 2025
1d242c3
Fix Windows test_ntpath failures.
Yhg1s Jun 3, 2025
12ac4a5
Drop test methods for unreadable symlinks (on darwin), which aren't
Yhg1s Jun 3, 2025
8f53def
Don't export LinkFallbackError from tarfile.
Yhg1s Jun 3, 2025
2c2df0d
Add back test_realpath_unreadable_symlink_strict
encukou Jun 3, 2025
ead96bb
Fix merge error in backport.
Yhg1s Jun 3, 2025
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Add back test_realpath_unreadable_symlink_strict 
This one passes on MacOS, and gives some test coverage for OSErrors
other than missing files.
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@encukou
encukou committed Jun 3, 2025
commit 2c2df0d62e88a56543723570618d289e07dfe56c
21 changes: 21 additions & 0 deletions Lib/test/test_posixpath.py
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Original file line number Diff line number Diff line change
Expand Up @@ -795,6 +795,27 @@ def test_realpath_resolve_first(self, kwargs):
safe_rmdir(ABSTFN + "/k")
safe_rmdir(ABSTFN)

@os_helper.skip_unless_symlink
@skip_if_ABSTFN_contains_backslash
@unittest.skipIf(os.chmod not in os.supports_follow_symlinks, "Can't set symlink permissions")
@unittest.skipIf(sys.platform != "darwin", "only macOS requires read permission to readlink()")
@_parameterize({'strict': True}, {'strict': ALLOW_MISSING})
def test_realpath_unreadable_symlink_strict(self, kwargs):
try:
os.symlink(ABSTFN+"1", ABSTFN)
os.chmod(ABSTFN, 0o000, follow_symlinks=False)
with self.assertRaises(PermissionError):
realpath(ABSTFN, **kwargs)
with self.assertRaises(PermissionError):
realpath(ABSTFN + '/foo', **kwargs),
with self.assertRaises(PermissionError):
realpath(ABSTFN + '/../foo', **kwargs)
with self.assertRaises(PermissionError):
realpath(ABSTFN + '/foo/..', **kwargs)
finally:
os.chmod(ABSTFN, 0o755, follow_symlinks=False)
os.unlink(ABSTFN)

@skip_if_ABSTFN_contains_backslash
@os_helper.skip_unless_symlink
def test_realpath_unreadable_directory(self):
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