iptables in excuses triggers tests in other packages. The excuses report doesn't show the fully green results anymore, so it's easy to miss them.
I think we can consider the ufw dep8 tests as sufficient for the case of "normal iptables usage hasn't regressed". I ran the ufw debian/tests/root-unittest DEP8 test in a jammy vm, and checked with execsnoop that it was calling the real iptables during the tests, and not just pretending or calling a fake binary like the normal unittest test. I aborted it after a few minutes, because the extra logging was taking a lot of time, but here is a sample: 17:12:30 TIME TIME(s) UID PCOMM PID PPID RET ARGS 17:12:30 1.962 0 iptables 28768 28767 0 /usr/sbin/iptables --version 17:12:30 1.964 0 iptables 28773 28772 0 /usr/sbin/iptables --version 17:12:30 2.002 0 iptables 28817 28816 0 /usr/sbin/iptables -V 17:12:30 2.203 0 iptables 29060 29059 0 /usr/sbin/iptables -V 17:12:30 2.205 0 ip6tables 29062 29061 0 /sbin/ip6tables -L INPUT -n 17:12:30 2.205 0 iptables 29063 29061 0 /sbin/iptables -F ufw-logging-deny 17:12:30 2.206 0 iptables 29064 29061 0 /sbin/iptables -F ufw-logging-allow (...) 17:12:30 2.552 0 iptables 29371 29225 0 /usr/sbin/iptables -D ufw-user-logging-forward -j RETURN 17:12:30 2.553 0 iptables 29372 29225 0 /usr/sbin/iptables -A ufw-after-logging-input -j LOG --log-prefix [UFW BLOCK] -m limit --limit 3/min --limit-burst 10 17:12:30 2.553 0 iptables 29373 29225 0 /usr/sbin/iptables -A ufw-after-logging-forward -j LOG --log-prefix [UFW BLOCK] -m limit --limit 3/min --limit-burst 10 17:12:30 2.554 0 iptables 29374 29225 0 /usr/sbin/iptables -I ufw-logging-deny -m conntrack --ctstate INVALID -j RETURN -m limit --limit 3/min --limit-burst 10 17:12:30 2.555 0 iptables 29375 29225 0 /usr/sbin/iptables -A ufw-logging-deny -j LOG --log-prefix [UFW BLOCK] -m limit --limit 3/min --limit-burst 10 17:12:30 2.555 0 iptables 29376 29225 0 /usr/sbin/iptables -A ufw-logging-allow -j LOG --log-prefix [UFW ALLOW] -m limit --limit 3/min --limit-burst 10 17:12:30 2.556 0 iptables 29377 29225 0 /usr/sbin/iptables -D ufw-user-limit -m limit --limit 3/minute -j LOG --log-prefix [UFW LIMIT BLOCK] 17:12:30 2.557 0 iptables 29378 29225 0 /usr/sbin/iptables -I ufw-user-limit -m limit --limit 3/minute -j LOG --log-prefix [UFW LIMIT BLOCK] 17:12:31 2.601 0 iptables 29380 29379 0 /usr/sbin/iptables -V 17:12:31 2.609 0 iptables 29383 29057 0 /usr/sbin/iptables -L -n (...) # grep iptables d-t-root-unittest.log |wc -l 9389 All these while iptables from jammy-proposed was installed: # apt-cache policy iptables iptables: Installed: 1.8.7-1ubuntu5.1 Candidate: 1.8.7-1ubuntu5.1 Version table: *** 1.8.7-1ubuntu5.1 500 500 http://br.archive.ubuntu.com/ubuntu jammy-proposed/main amd64 Packages With that in mind, let's confirm that the ufw dep8 tests ran with the iptables package from proposed for each ubuntu release: # Kinetic Results yaml: https://ubuntu-archive-team.ubuntu.com/proposed-migration/kinetic/update_excuses.yaml.xz ufw/amd64 log: https://autopkgtest.ubuntu.com/results/autopkgtest- kinetic/kinetic/amd64/u/ufw/20230515_201517_324f0@/log.gz iptables from kinetic-proposed: $ zgrep kinetic-proposed/main.*iptables log.gz |head -n 1 Get:1 http://ftpmaster.internal/ubuntu kinetic-proposed/main amd64 iptables amd64 1.8.7-1ubuntu6.1 [454 kB] root-unittest passed: $ zgrep ^root-unittest kinetic-log.gz root-unittest PASS root-unittest PASS # Jammy Results yaml: https://ubuntu-archive-team.ubuntu.com/proposed-migration/jammy/update_excuses.yaml.xz ufw/amd64 log: https://autopkgtest.ubuntu.com/results/autopkgtest- jammy/jammy/amd64/u/ufw/20230516_174358_f55b2@/log.gz iptables from jammy-proposed: $ zgrep jammy-proposed/main.*iptables jammy-log.gz |head -n 1 Get:1 http://ftpmaster.internal/ubuntu jammy-proposed/main amd64 iptables amd64 1.8.7-1ubuntu5.1 [455 kB] root-unittest passed: $ zgrep ^root-unittest jammy-log.gz root-unittest PASS root-unittest PASS # focal Results yaml: https://ubuntu-archive-team.ubuntu.com/proposed-migration/focal/update_excuses.yaml.xz ufw/amd64 log: https://autopkgtest.ubuntu.com/results/autopkgtest- focal/focal/amd64/u/ufw/20230518_023831_3747d@/log.gz iptables from focal-proposed: $ zgrep focal-proposed/main.*iptables focal-log.gz |head -n 1 Get:1 http://ftpmaster.internal/ubuntu focal-proposed/main amd64 iptables amd64 1.8.4-3ubuntu2.1 [390 kB] root-unittest passed: $ zgrep ^root-unittest focal-log.gz root-unittest PASS root-unittest PASS # bionic Results yaml: https://ubuntu-archive-team.ubuntu.com/proposed-migration/bionic/update_excuses.yaml.xz There is no ufw run for bionic (my luck). So let's pick something else. I thought about checking the docker.io DEP8 tests, since docker does use iptables to setup networking. Turns out just by installing docker.io it already calls iptables multiple times via the service restart it does in postinst: (...) Get:1 http://br.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 docker.io amd64 20.10.21-0ubuntu1~18.04.3 [30.3 MB] Fetched 30.3 MB in 1s (33.3 MB/s) Preconfiguring packages ... (Reading database ... 86244 files and directories currently installed.) Preparing to unpack .../docker.io_20.10.21-0ubuntu1~18.04.3_amd64.deb ... Unpacking docker.io (20.10.21-0ubuntu1~18.04.3) over (20.10.21-0ubuntu1~18.04.3) ... Setting up docker.io (20.10.21-0ubuntu1~18.04.3) ... Processing triggers for man-db (2.8.3-2ubuntu0.1) ... And execsnoop on bionic: root@b-ipt:~# execsnoop-bpfcc -n tables PCOMM PID PPID RET ARGS iptables 28557 28524 0 /sbin/iptables --wait -t nat -L -n iptables 28561 28524 0 /sbin/iptables --wait -L -n iptables 28562 28524 0 /sbin/iptables --version iptables 28563 28524 0 /sbin/iptables --wait -t filter -C FORWARD -j DOCKER-ISOLATION iptables 28564 28524 0 /sbin/iptables --wait -t nat -D PREROUTING -m addrtype --dst-type LOCAL -j DOCKER iptables 28566 28524 0 /sbin/iptables --wait -t nat -D OUTPUT -m addrtype --dst-type LOCAL ! --dst 127.0.0.0/8 -j DOCKER iptables 28567 28524 0 /sbin/iptables --wait -t nat -D OUTPUT -m addrtype --dst-type LOCAL -j DOCKER (...) ubuntu@b-ipt:~$ sudo docker network list NETWORK ID NAME DRIVER SCOPE 69b1780a684a bridge bridge local 77b64dbf809d host host local bb18e7f881ed none null local And that was using the proposed version of iptables: $ apt-cache policy iptables iptables: Installed: 1.6.1-2ubuntu2.1 Candidate: 1.6.1-2ubuntu2.1 Version table: *** 1.6.1-2ubuntu2.1 500 500 http://br.archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages So this, plus the fact that the docker.io DEP8 tests passed on bionic too, should be good for bionic. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to iptables in Ubuntu. https://bugs.launchpad.net/bugs/1992454 Title: iptables: segfault when renaming a chain Status in iptables package in Ubuntu: Fix Released Status in iptables source package in Bionic: Fix Committed Status in iptables source package in Focal: Fix Committed Status in iptables source package in Jammy: Fix Committed Status in iptables source package in Kinetic: Fix Committed Bug description: [ Impact ] * An explanation of the effects of the bug on users This is the description for the upstream fix of this bug[1] : This is an odd bug: If the number of chains is right and one renames the last one in the list, libiptc dereferences a NULL pointer. * justification for backporting the fix to the stable release. Without this patch, users may experience segmentation fault when using the following versions of iptables : - Bionic : iptables - Focal : iptables - Jammy : iptables-legacy - Kinetic: iptables-legacy * In addition, it is helpful, but not required, to include an explanation of how the upload fixes this bug. The upstream fix adjust the size of the chain_index if the element is the last chain in the list. [1] http://git.netfilter.org/iptables/commit/?id=97bf4e68fc0794adba3243fd96f40f4568e7216f [ Test Plan ] * detailed instructions how to reproduce the bug The following code (adapted from the upstream commit to work on Kinetic) may be used to reproduce the issue : ----------------------------------------8<-------------------------------- #!/bin/bash # # Cover for a bug in libiptc: # - the chain 'node-98-tmp' is the last in the list sorted by name # - there are 81 chains in total, so three chain index buckets # - the last index bucket contains only the 'node-98-tmp' chain # => rename temporarily removes it from the bucket, leaving a NULL bucket # behind which is dereferenced later when inserting the chain again with new # name again ( echo "*filter" for chain in node-1 node-10 node-101 node-102 node-104 node-107 node-11 node-12 node-13 node-14 node-15 node-16 node-17 node-18 node-19 node-2 node-20 node-21 node-22 node-23 node-25 node-26 node-27 node-28 node-29 node-3 node-30 node-31 node-32 node-33 node-34 node-36 node-37 node-39 node-4 node-40 node-41 node-42 node-43 node-44 node-45 node-46 node-47 node-48 node-49 node-5 node-50 node-51 node-53 node-54 node-55 node-56 node-57 node-58 node-59 node-6 node-60 node-61 node-62 node-63 node-64 node-65 node-66 node-68 node-69 node-7 node-70 node-71 node-74 node-75 node-76 node-8 node-80 node-81 node-86 node-89 node-9 node-92 node-93 node-95 node-98-tmp; do echo ":$chain - [0:0]" done echo "COMMIT" ) | $XT_MULTI iptables-legacy-restore $XT_MULTI iptables-legacy -E node-98-tmp node-98 exit $? ---------------------------------------->8-------------------------------- Alternatively, this test has been added to the DEP8 list of tests, and will be executed automatically once the package is accepted into proposed. The DEP8 logs can be inspected for its run. Look for a test named "0006rename-segfault". [ Where problems could occur ] For Jammy and onward, only users of the -legacy commands may be affected. Since Jammy, iptables uses the new nft libraries which are not affected by the bug. For Bionic and Focal users, the regular iptables command is affected by the change. As stated in the manpage : E, --rename-chain old-chain new-chain Rename the user specified chain to the user supplied name. This is cosmetic, and has no effect on the structure of the table. In case of a problem, only the modification of the name would be affected as this is clearly outlined as a cosmetic only change. [ Other Info ] The patch is also applied to lunar and mantic, but is fixed in upstream's 1.8.9 release which so far is only in debian testing/unstable. This is being uploaded together with test fixes from bug #1992454 (bionic-specific) and bug #2019023 (focal-specific), which were found and fixed while trying out the DEP8 runs for this package. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/iptables/+bug/1992454/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp