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212 lines
8.8 KiB
212 lines
8.8 KiB
5 months ago
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From d54e22a669ae6e987199bb5d2c69bb5a46b0083b Mon Sep 17 00:00:00 2001
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From: Serhiy Storchaka <storchaka@gmail.com>
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Date: Wed, 17 Jan 2024 15:47:47 +0200
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Subject: [PATCH] [3.9] gh-91133: tempfile.TemporaryDirectory: fix symlink bug
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in cleanup (GH-99930) (GH-112842)
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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(cherry picked from commit 81c16cd94ec38d61aa478b9a452436dc3b1b524d)
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Co-authored-by: Søren Løvborg <sorenl@unity3d.com>
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---
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Lib/tempfile.py | 27 ++--
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Lib/test/test_tempfile.py | 117 +++++++++++++++++-
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...2-12-01-16-57-44.gh-issue-91133.LKMVCV.rst | 2 +
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3 files changed, 136 insertions(+), 10 deletions(-)
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create mode 100644 Misc/NEWS.d/next/Library/2022-12-01-16-57-44.gh-issue-91133.LKMVCV.rst
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diff --git a/Lib/tempfile.py b/Lib/tempfile.py
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index eafce6f25b6fb2..59a628a1744685 100644
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--- a/Lib/tempfile.py
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+++ b/Lib/tempfile.py
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@@ -268,6 +268,22 @@ def _mkstemp_inner(dir, pre, suf, flags, output_type):
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raise FileExistsError(_errno.EEXIST,
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"No usable temporary file name found")
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+def _dont_follow_symlinks(func, path, *args):
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+ # Pass follow_symlinks=False, unless not supported on this platform.
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+ if func in _os.supports_follow_symlinks:
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+ func(path, *args, follow_symlinks=False)
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+ elif _os.name == 'nt' or not _os.path.islink(path):
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+ func(path, *args)
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+
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+def _resetperms(path):
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+ try:
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+ chflags = _os.chflags
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+ except AttributeError:
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+ pass
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+ else:
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+ _dont_follow_symlinks(chflags, path, 0)
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+ _dont_follow_symlinks(_os.chmod, path, 0o700)
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+
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# User visible interfaces.
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@@ -789,17 +805,10 @@ def __init__(self, suffix=None, prefix=None, dir=None):
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def _rmtree(cls, name):
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def onerror(func, path, exc_info):
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if issubclass(exc_info[0], PermissionError):
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- def resetperms(path):
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- try:
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- _os.chflags(path, 0)
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- except AttributeError:
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- pass
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- _os.chmod(path, 0o700)
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-
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try:
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if path != name:
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- resetperms(_os.path.dirname(path))
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- resetperms(path)
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+ _resetperms(_os.path.dirname(path))
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+ _resetperms(path)
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try:
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_os.unlink(path)
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diff --git a/Lib/test/test_tempfile.py b/Lib/test/test_tempfile.py
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index 8ad1bb98e8e899..571263d9c957d7 100644
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--- a/Lib/test/test_tempfile.py
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+++ b/Lib/test/test_tempfile.py
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@@ -1394,6 +1394,103 @@ def test_cleanup_with_symlink_to_a_directory(self):
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"were deleted")
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d2.cleanup()
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+ @support.skip_unless_symlink
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+ def test_cleanup_with_symlink_modes(self):
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+ # cleanup() should not follow symlinks when fixing mode bits (#91133)
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+ with self.do_create(recurse=0) as d2:
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+ file1 = os.path.join(d2, 'file1')
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+ open(file1, 'wb').close()
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+ dir1 = os.path.join(d2, 'dir1')
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+ os.mkdir(dir1)
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+ for mode in range(8):
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+ mode <<= 6
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+ with self.subTest(mode=format(mode, '03o')):
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+ def test(target, target_is_directory):
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+ d1 = self.do_create(recurse=0)
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+ symlink = os.path.join(d1.name, 'symlink')
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+ os.symlink(target, symlink,
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+ target_is_directory=target_is_directory)
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+ try:
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+ os.chmod(symlink, mode, follow_symlinks=False)
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+ except NotImplementedError:
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+ pass
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+ try:
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+ os.chmod(symlink, mode)
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+ except FileNotFoundError:
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+ pass
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+ os.chmod(d1.name, mode)
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+ d1.cleanup()
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+ self.assertFalse(os.path.exists(d1.name))
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+
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+ with self.subTest('nonexisting file'):
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+ test('nonexisting', target_is_directory=False)
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+ with self.subTest('nonexisting dir'):
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+ test('nonexisting', target_is_directory=True)
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+
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+ with self.subTest('existing file'):
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+ os.chmod(file1, mode)
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+ old_mode = os.stat(file1).st_mode
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+ test(file1, target_is_directory=False)
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+ new_mode = os.stat(file1).st_mode
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+ self.assertEqual(new_mode, old_mode,
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+ '%03o != %03o' % (new_mode, old_mode))
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+
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+ with self.subTest('existing dir'):
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+ os.chmod(dir1, mode)
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+ old_mode = os.stat(dir1).st_mode
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+ test(dir1, target_is_directory=True)
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+ new_mode = os.stat(dir1).st_mode
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+ self.assertEqual(new_mode, old_mode,
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+ '%03o != %03o' % (new_mode, old_mode))
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+
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+ @unittest.skipUnless(hasattr(os, 'chflags'), 'requires os.chflags')
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+ @support.skip_unless_symlink
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+ def test_cleanup_with_symlink_flags(self):
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+ # cleanup() should not follow symlinks when fixing flags (#91133)
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+ flags = stat.UF_IMMUTABLE | stat.UF_NOUNLINK
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+ self.check_flags(flags)
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+
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+ with self.do_create(recurse=0) as d2:
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+ file1 = os.path.join(d2, 'file1')
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+ open(file1, 'wb').close()
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+ dir1 = os.path.join(d2, 'dir1')
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+ os.mkdir(dir1)
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+ def test(target, target_is_directory):
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+ d1 = self.do_create(recurse=0)
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+ symlink = os.path.join(d1.name, 'symlink')
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+ os.symlink(target, symlink,
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+ target_is_directory=target_is_directory)
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+ try:
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+ os.chflags(symlink, flags, follow_symlinks=False)
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+ except NotImplementedError:
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+ pass
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+ try:
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+ os.chflags(symlink, flags)
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+ except FileNotFoundError:
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+ pass
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+ os.chflags(d1.name, flags)
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+ d1.cleanup()
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+ self.assertFalse(os.path.exists(d1.name))
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+
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+ with self.subTest('nonexisting file'):
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+ test('nonexisting', target_is_directory=False)
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+ with self.subTest('nonexisting dir'):
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+ test('nonexisting', target_is_directory=True)
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+
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+ with self.subTest('existing file'):
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+ os.chflags(file1, flags)
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+ old_flags = os.stat(file1).st_flags
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+ test(file1, target_is_directory=False)
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+ new_flags = os.stat(file1).st_flags
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+ self.assertEqual(new_flags, old_flags)
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+
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+ with self.subTest('existing dir'):
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+ os.chflags(dir1, flags)
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+ old_flags = os.stat(dir1).st_flags
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+ test(dir1, target_is_directory=True)
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+ new_flags = os.stat(dir1).st_flags
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+ self.assertEqual(new_flags, old_flags)
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+
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@support.cpython_only
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def test_del_on_collection(self):
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# A TemporaryDirectory is deleted when garbage collected
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@@ -1506,9 +1603,27 @@ def test_modes(self):
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d.cleanup()
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self.assertFalse(os.path.exists(d.name))
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- @unittest.skipUnless(hasattr(os, 'chflags'), 'requires os.lchflags')
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+ def check_flags(self, flags):
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+ # skip the test if these flags are not supported (ex: FreeBSD 13)
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+ filename = support.TESTFN
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+ try:
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+ open(filename, "w").close()
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+ try:
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+ os.chflags(filename, flags)
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+ except OSError as exc:
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+ # "OSError: [Errno 45] Operation not supported"
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+ self.skipTest(f"chflags() doesn't support flags "
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+ f"{flags:#b}: {exc}")
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+ else:
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+ os.chflags(filename, 0)
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+ finally:
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+ support.unlink(filename)
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+
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+ @unittest.skipUnless(hasattr(os, 'chflags'), 'requires os.chflags')
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def test_flags(self):
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flags = stat.UF_IMMUTABLE | stat.UF_NOUNLINK
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+ self.check_flags(flags)
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+
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d = self.do_create(recurse=3, dirs=2, files=2)
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with d:
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# Change files and directories flags recursively.
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diff --git a/Misc/NEWS.d/next/Library/2022-12-01-16-57-44.gh-issue-91133.LKMVCV.rst b/Misc/NEWS.d/next/Library/2022-12-01-16-57-44.gh-issue-91133.LKMVCV.rst
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new file mode 100644
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index 00000000000000..7991048fc48e03
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Library/2022-12-01-16-57-44.gh-issue-91133.LKMVCV.rst
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@@ -0,0 +1,2 @@
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+Fix a bug in :class:`tempfile.TemporaryDirectory` cleanup, which now no longer
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+dereferences symlinks when working around file system permission errors.
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