netdev - Re: Bug#1106321: iproute2: "ip monitor" fails with current trixie's linux kernel / iproute2 combination

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 for Android: free password hash cracker in your pocket

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

Message-ID: <CAMw=ZnSsy3t+7uppThVVf2610iCTTSdg+YG5q9FEa=tBn_aLpw@mail.gmail.com>
Date: Thu, 22 May 2025 23:55:18 +0100
From: Luca Boccassi <bluca@...ian.org>
To: Stephen Hemminger <stephen@...workplumber.org>, David Ahern <dsahern@...nel.org>
Cc: 1106321@...s.debian.org, Netdev <netdev@...r.kernel.org>
Subject: Re: Bug#1106321: iproute2: "ip monitor" fails with current trixie's
 linux kernel / iproute2 combination

On Thu, 22 May 2025 at 20:41, Adel Belhouane <bugs.a.b@...e.fr> wrote:
>
> Package: iproute2
> Version: 6.14.0-3
> Severity: normal
> X-Debbugs-Cc: bugs.a.b@...e.fr
>
> Dear Maintainer,
>
> Having iproute2 >= 6.14 while running a linux kernel < 6.14
> triggers this bug (tested using debian-13-nocloud-amd64-daily-20250520-2118.qcow2)
>
>     root@...alhost:~# ip monitor
>     Failed to add ipv4 mcaddr group to list
>
> More specifically this subcommand, which didn't exist in iproute2 6.13
> is affected:
>
>     root@...alhost:~# ip mon maddr
>     Failed to add ipv4 mcaddr group to list
>     root@...alhost:~# ip -6 mon maddr
>     Failed to add ipv6 mcaddr group to list
>
> causing the generic "ip monitor" command to fail.
>
> As trixie will use a 6.12.x kernel, trixie is affected.
>
> bookworm's iproute2/bookworm-backports is also affected since currently
> bookworm's backport kernel is also 6.12.x
>
> Workarounds:
> * upgrade the kernel to experimental's (currently) 6.14.6-1~exp1
> * downgrade iproute2 to 6.13.0-1 (using snapshot.d.o)
> * on bookworm downgrade (using snapshot.d.o)
>   iproute2 backport to 6.13.0-1~bpo12+1
>
> Details I could gather:
>
> This appears to come from this iproute2 6.14's commit:
>
> https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?h=v6.14.0&id=7240e0e40f8332dd9f11348700c0c96b8df4ca5b
>
> which appears to depend on new kernel 6.14 rtnetlink features as described
> in Kernelnewbies ( https://kernelnewbies.org/Linux_6.14#Networking ):
>
> Add ipv6 anycast join/leave notifications
>
> with this (kernel 6.14) commit:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=33d97a07b3ae6fa713919de4e1864ca04fff8f80

Hi Stephen and David,

It looks like there's a regression in iproute2 6.14, and 'ip monitor'
no longer works with kernels < 6.14. Could you please have a look when
you have a moment? Thanks!