netdev - [PATCH net v2 0/4] bonding: properly restore flags when bond changes ether type

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230314111426.1254998-1-razor@blackwall.org>
Date:   Tue, 14 Mar 2023 13:14:22 +0200
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     netdev@...r.kernel.org
Cc:     monis@...taire.com, syoshida@...hat.com, j.vosburgh@...il.com,
        andy@...yhouse.net, kuba@...nel.org, davem@...emloft.net,
        pabeni@...hat.com, edumazet@...gle.com,
        syzbot+9dfc3f3348729cc82277@...kaller.appspotmail.com,
        Nikolay Aleksandrov <razor@...ckwall.org>
Subject: [PATCH net v2 0/4] bonding: properly restore flags when bond changes ether type

Hi,
A bug was reported by syzbot[1] that causes a warning and a myriad of
other potential issues if a bond, that is also a slave, fails to enslave a
non-eth device. While fixing that bug I found that we have the same
issues when such enslave passes and after that the bond changes back to
ARPHRD_ETHER (again due to ether_setup). This set fixes all issues by
extracting the ether_setup() sequence in a helper which does the right
thing about bond flags when it needs to change back to ARPHRD_ETHER. It
also adds selftests for these cases.

Patch 01 adds the new bond_ether_setup helper that is used in the
following patches to fix the bond dev flag issues. Patch 02 fixes the
issues when a bond device changes its ether type due to successful
enslave. Patch 03 fixes the issues when it changes its ether type due to
an unsuccessful enslave. Note we need two patches because the bugs were
introduced by different commits. Patch 04 adds the new selftests.

v2: new set, all patches are new due to new approach of fixing these bugs

Thanks,
 Nik

[1] https://syzkaller.appspot.com/bug?id=391c7b1f6522182899efba27d891f1743e8eb3ef

Nikolay Aleksandrov (4):
  bonding: add bond_ether_setup helper
  bonding: restore IFF_MASTER/SLAVE flags on bond enslave ether type
    change
  bonding: restore bond's IFF_SLAVE flag if a non-eth dev enslave fails
  selftests: bonding: add tests for ether type changes

 drivers/net/bonding/bond_main.c               | 22 +++--
 .../selftests/drivers/net/bonding/Makefile    |  3 +-
 .../net/bonding/bond-eth-type-change.sh       | 85 +++++++++++++++++++
 3 files changed, 102 insertions(+), 8 deletions(-)
 create mode 100755 tools/testing/selftests/drivers/net/bonding/bond-eth-type-change.sh

-- 
2.39.2