openstack
/
neutron-fwaas
Code Issues Proposed changes

Define types for C calls in netlink_lib 

Borrowed from neutron fix related to oslo.privsep 1.31
https://review.openstack.org/#/c/629335/
-----
Previously this was not done, which meant all arguments were
assumed to be ints. As long as we didn't get any large pointer
addresses this worked fine, but for some reason the addition of
threading to oslo.privsep triggered larger addresses that were then
truncated. This caused segfaults in the underlying C library because
we were passing it invalid pointers.

This change sets argument and return types for all of the calls
that are used in the module.
-----

Note: The root cause of the failure of
neutron_fwaas.tests.functional.privileged.InNamespaceTest.test_in_namespace
is different and it will be covered by the next patch
(See Ie5b238f1df707ea3ce50b5711ff791bac2681a2f),
so it is skipped temporarily.

Partial-Bug: #1811506
Change-Id: I3ea8c71a96d4c38988a38947c0ebcaf602a57842
This commit is contained in:
Akihiro Motoki 2019-01-12 20:10:03 +09:00
parent 781a06c983
commit f1d40107e8
2 changed files with 38 additions and 1 deletions
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37
neutron_fwaas/privileged/netlink_lib.py
View File

@ -48,9 +48,44 @@ from neutron_fwaas.privileged import utils as fwaas_utils
LOG = logging.getLogger(__name__)
nfct = ctypes.CDLL(util.find_library('netfilter_conntrack'))
nfct_lib = util.find_library('netfilter_conntrack')
nfct = ctypes.CDLL(nfct_lib)
libc = ctypes.CDLL(util.find_library('libc.so.6'))
# In unit tests the actual nfct library may not be installed, and since we
# don't make actual calls to it we don't want to add a hard dependency.
if nfct_lib:
# It's important that the types be defined properly on all of the functions
# we call from nfct, otherwise pointers can be truncated and cause
# segfaults.
nfct.nfct_set_attr.argtypes = [ctypes.c_void_p,
ctypes.c_int,
ctypes.c_void_p]
nfct.nfct_set_attr_u8.argtypes = [ctypes.c_void_p,
ctypes.c_int,
ctypes.c_uint8]
nfct.nfct_set_attr_u16.argtypes = [ctypes.c_void_p,
ctypes.c_int,
ctypes.c_uint16]
nfct.nfct_snprintf.argtypes = [ctypes.c_char_p,
ctypes.c_uint,
ctypes.c_void_p,
ctypes.c_uint,
ctypes.c_uint,
ctypes.c_uint]
nfct.nfct_new.restype = ctypes.c_void_p
nfct.nfct_destroy.argtypes = [ctypes.c_void_p]
nfct.nfct_query.argtypes = [ctypes.c_void_p,
ctypes.c_int,
ctypes.c_void_p]
nfct.nfct_callback_register.argtypes = [ctypes.c_void_p,
ctypes.c_int,
ctypes.c_void_p,
ctypes.c_void_p]
nfct.nfct_open.restype = ctypes.c_void_p
nfct.nfct_close.argtypes = [ctypes.c_void_p]
IP_VERSIONS = [constants.IP_VERSION_4, constants.IP_VERSION_6]
DATA_CALLBACK = None

2
neutron_fwaas/tests/functional/privileged/test_utils.py
View File

@ -14,6 +14,7 @@
# under the License.
import os
import unittest
from neutron.tests.common import net_helpers
from neutron.tests.functional import base
@ -27,6 +28,7 @@ def get_netns_inode(namespace):
class InNamespaceTest(base.BaseSudoTestCase):
@unittest.skip('Temporarily skipped until a fix against oslo.privsep 1.31')
def test_in_namespace(self):
namespace = self.useFixture(net_helpers.NamespaceFixture()).name
expected = get_netns_inode(namespace)