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Message #159229
[Bug 1511735] Re: libnl: fail to bind() netlink sockets
Tests are OK for us.
Here is a screen shot of the manuel test:
root@ubuntu1404:~# apt-get install libnl-3-200/trusty-proposed libnl-3-dev/trusty-proposed libnl-genl-3-200/trusty-proposed libnl-genl-3-dev/trusty-proposed libnl-nf-3-200/trusty-proposed libnl-nf-3-dev/trusty-proposed libnl-route-3-200/trusty-proposed libnl-route-3-dev/trusty-proposed
[snip]
Get:1 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main libnl-genl-3-dev amd64 3.2.21-1ubuntu1 [9,488 B]
Get:2 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main libnl-genl-3-200 amd64 3.2.21-1ubuntu1 [10.2 kB]
Get:3 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main libnl-nf-3-dev amd64 3.2.21-1ubuntu1 [26.2 kB]
Get:4 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main libnl-route-3-dev amd64 3.2.21-1ubuntu1 [103 kB]
Get:5 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main libnl-3-dev amd64 3.2.21-1ubuntu1 [69.5 kB]
Get:6 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main libnl-nf-3-200 amd64 3.2.21-1ubuntu1 [27.6 kB]
Get:7 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main libnl-route-3-200 amd64 3.2.21-1ubuntu1 [96.1 kB]
Get:8 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main libnl-3-200 amd64 3.2.21-1ubuntu1 [45.8 kB]
[snip]
root@ubuntu1404:~# python ./libnl3-test-rh1249158.py a b c d
ulimit(NOFILE) = (2048, 4096)
Test: PID=18863
TEST (a)...
...done
TEST (b)...
...done
TEST (c)...
...done
TEST (d)...
...done
root@ubuntu1404:~# cd libnl-bp/
root@ubuntu1404:~/libnl-bp# if ./example.sh ; then echo success ; else echo failure ; fi
gcc -o example -I/usr/include/libnl3 example.c -lnl-3 -lnl-genl-3
set manually the local port to 18895 (pid: 18894)
local port has been set by the libnl to 4060105167 (pid: 18895)
success
root@ubuntu1404:~/libnl-bp#
We also have an internal test suite for our product (which heavily use
the libnl) and no problem was detected.
** Tags removed: verification-needed
** Tags added: verification-done
--
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Packages, which is subscribed to libnl3 in Ubuntu.
https://bugs.launchpad.net/bugs/1511735
Title:
libnl: fail to bind() netlink sockets
Status in libnl3 package in Ubuntu:
Fix Released
Status in libnl3 source package in Trusty:
Fix Committed
Status in libnl3 package in Debian:
New
Bug description:
[Impact]
* Applications in Trusty using libnl-3-200 which frequently open and
close netlink sockets can easily fail when attempting to bind the
local socket. The problem happens when libnl choose a port id
already used by another application and subsequently libnl fails
instead of trying another port id.
The original bug was discovered when attempting to start a virtual
machine under libvirt, which is a user of this library.
* Backporting fixes from upstream release fixes a real bug in the
current version of the library in Trusty. The alternative is for all
applications to manually manage their local port allocation, or as
upstream has accepted allowing libnl to attempt to try for other
local ports.
* All patches applied are already accepted upstream and newer Ubuntu
releases are not affected.
[Test Case]
* On a Trusty 14.04 system
1. sudo apt-get install libnl-3-200 libnl-3-dev libnl-3-dev \
libnl-genl-3-dev libnl-route-3-200 \
make gcc build-essential libnl1
2. download and unpack attachment: lp_1511735_test.tar
3. Run testcases:
% if ./example.sh; then echo "libnl OK"; else echo "libnl FAILED"; fi
gcc -o example -I/usr/include/libnl3 example.c -lnl-3 -lnl-genl-3
set manually the local port to 6975 (pid: 6974)
local port has been set by the libnl to 6975 (pid: 6975)
ERROR: genl_connect(): Object exists (local port: 6975, pid: 6975)
libnl FAILED
% python libnl3-test-rh1249158.py a b c d
ulimit(NOFILE) = (2048, 4096)
Test: PID=6978
TEST (a)...
Traceback (most recent call last):
File "libnl3-test-rh1249158.py", line 226, in <module>
locals()["TEST_" + arg]()
File "libnl3-test-rh1249158.py", line 140, in TEST_a
sk = nl_get_socket()
File "libnl3-test-rh1249158.py", line 115, in nl_get_socket
raise IOError(-err, _nl_geterror())
OSError: [Errno 6] b'Unspecific failure'
4. After applying the updated packages:
% if ./example.sh; then echo "libnl OK"; else echo "libnl FAILED"; fi
gcc -o example -I/usr/include/libnl3 example.c -lnl-3 -lnl-genl-3
set manually the local port to 11295 (pid: 11294)
local port has been set by the libnl to 2894081055 (pid: 11295)
libnl OK
% python libnl3-test-rh1249158.py a b c d
ulimit(NOFILE) = (2048, 4096)
Test: PID=11296
TEST (a)...
...done
TEST (b)...
...done
TEST (c)...
...done
TEST (d)...
...done
[Regression Potential]
* There are quite a few high profile packages that depend on this package,
notably libvirt and network-manager. The complete list is here:
# on Trusty
% apt-rdepends -r libnl-3-200 | head -n 33
libnl-3-200
Reverse Depends: batctl (>= 2013.4.0-2)
Reverse Depends: bmon (>= 1:3.1-1)
Reverse Depends: crda (>= 1.1.2-1ubuntu2)
Reverse Depends: hostapd (>= 1:2.1-0ubuntu1)
Reverse Depends: ipvsadm (>= 1:1.26-2ubuntu1)
Reverse Depends: iw (>= 3.4-1)
Reverse Depends: keepalived (>= 1:1.2.7-1ubuntu1)
Reverse Depends: kismet (>= 2013.03.R1b-3)
Reverse Depends: knemo (>= 0.7.6-2)
Reverse Depends: libfsobasics3 (>= 0.12.0-4)
Reverse Depends: libnetcf1 (>= 1:0.2.3-4ubuntu1)
Reverse Depends: libnl-3-200-dbg (= 3.2.21-1)
Reverse Depends: libnl-3-dev (= 3.2.21-1)
Reverse Depends: libnl-cli-3-200 (= 3.2.21-1)
Reverse Depends: libnl-genl-3-200 (= 3.2.21-1)
Reverse Depends: libnl-nf-3-200 (= 3.2.21-1)
Reverse Depends: libnl-route-3-200 (= 3.2.21-1)
Reverse Depends: libnl-utils (>= 3.2.21-1)
Reverse Depends: libnss-gw-name (>= 0.3-2)
Reverse Depends: libvirt-bin (>= 1.2.2-0ubuntu13)
Reverse Depends: libvirt0 (>= 1.2.2-0ubuntu13)
Reverse Depends: lowpan-test-tools (>= 0.3-1)
Reverse Depends: lowpan-tools (>= 0.3-1)
Reverse Depends: neard (>= 0.11-1)
Reverse Depends: neard-tools (>= 0.11-1)
Reverse Depends: network-manager (>= 0.9.8.8-0ubuntu7)
Reverse Depends: ntrack-module-libnl-0 (>= 016-1.2ubuntu2)
Reverse Depends: plainbox-provider-resource-generic (>= 0.3-1)
Reverse Depends: powertop (>= 2.5-1ubuntu1)
Reverse Depends: quota (>= 4.01-3)
Reverse Depends: sssd-common (>= 1.11.5-1ubuntu3)
Reverse Depends: wpasupplicant (>= 2.1-0ubuntu1)
* This patch does change the default behavoir when asking libnl-3-200
to generate local ports. Applications (or libraries) may already
have retry code in-place and it's not clear if those applications
would break.
[Original Description]
The following upstream patches are needed in order to avoid failures when binding a netlink socket:
1f734a8f892a lib/socket: randomize the generated local port
http://git.infradead.org/users/tgr/libnl.git/commitdiff/1f734a8f892a
4dd5fdd0af2c lib/socket: retry generate local port in nl_connect on ADDRINUSE
http://git.infradead.org/users/tgr/libnl.git/commitdiff/4dd5fdd0af2c
027157898708 lib/socket: don't fail if no more local ports can be assigned in nl_socket_alloc
http://git.infradead.org/users/tgr/libnl.git/commitdiff/027157898708
0fd510b3673f lib/socket: use proper typed constant UINT32_MAX for uint32_t typed port
http://git.infradead.org/users/tgr/libnl.git/commitdiff/0fd510b3673f
Without these patches, an application which opens and closes regularly
netlink sockets can easily fails to bind them.
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