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gh-107902: Don't test setting suid/sgid on systems that don't support them #108368

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encukou merged 2 commits into from
Sep 4, 2023
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gh-107902: Don't test setting suid/sgid on systems that don't support them #108368

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gh-107902: Don't test setting suid/sgid on systems that don't support…
encukou Aug 23, 2023
316b32b
Test suid bit on directories
encukou Aug 24, 2023
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33 changes: 19 additions & 14 deletions Lib/test/test_tarfile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3809,33 +3809,38 @@ def test_modes(self):
arc.add('no_bits', mode='?---------')
arc.add('dir/', mode='?---rwsrwt')

# On some systems, setting the sticky bit is a no-op.
# Check if that's the case.
# On some systems, setting the uid, gid, and/or sticky bit is a no-ops.
# Check which bits we can set, so we can compare tarfile machinery to
# a simple chmod.
tmp_filename = os.path.join(TEMPDIR, "tmp.file")
with open(tmp_filename, 'w'):
pass
os.chmod(tmp_filename, os.stat(tmp_filename).st_mode | stat.S_ISVTX)
have_sticky_files = (os.stat(tmp_filename).st_mode & stat.S_ISVTX)
new_mode = (os.stat(tmp_filename).st_mode
| stat.S_ISVTX | stat.S_ISGID | stat.S_ISUID)
os.chmod(tmp_filename, new_mode)
got_mode = os.stat(tmp_filename).st_mode
_t_file = 't' if (got_mode & stat.S_ISVTX) else 'x'
_suid_file = 's' if (got_mode & stat.S_ISUID) else 'x'
_sgid_file = 's' if (got_mode & stat.S_ISGID) else 'x'
os.unlink(tmp_filename)

os.mkdir(tmp_filename)
os.chmod(tmp_filename, os.stat(tmp_filename).st_mode | stat.S_ISVTX)
have_sticky_dirs = (os.stat(tmp_filename).st_mode & stat.S_ISVTX)
new_mode = os.stat(tmp_filename).st_mode | stat.S_ISVTX | stat.S_ISGID
os.chmod(tmp_filename, new_mode)
got_mode = os.stat(tmp_filename).st_mode
_t_dir = 't' if (got_mode & stat.S_ISVTX) else 'x'
_suid_dir = 's' if (got_mode & stat.S_ISUID) else 'x'
_sgid_dir = 's' if (got_mode & stat.S_ISGID) else 'x'
os.rmdir(tmp_filename)

with self.check_context(arc.open(), 'fully_trusted'):
if have_sticky_files:
self.expect_file('all_bits', mode='?rwsrwsrwt')
else:
self.expect_file('all_bits', mode='?rwsrwsrwx')
self.expect_file('all_bits',
mode=f'?rw{_suid_file}rw{_sgid_file}rw{_t_file}')
self.expect_file('perm_bits', mode='?rwxrwxrwx')
self.expect_file('exec_group_other', mode='?rw-rwxrwx')
self.expect_file('read_group_only', mode='?---r-----')
self.expect_file('no_bits', mode='?---------')
if have_sticky_dirs:
self.expect_file('dir/', mode='?---rwsrwt')
else:
self.expect_file('dir/', mode='?---rwsrwx')
self.expect_file('dir/', mode=f'?---rw{_sgid_dir}rw{_t_dir}')

with self.check_context(arc.open(), 'tar'):
self.expect_file('all_bits', mode='?rwxr-xr-x')
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