From: Stephen Hemminger <stephen@networkplumber.org>
To: Ido Schimmel <idosch@nvidia.com>
Cc: netdev@vger.kernel.org, dsahern@kernel.org,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@kernel.org>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Simon Horman <horms@kernel.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH net v2 2/3] ipv6: return EMSGSIZE when first route in dump does not fit
Date: Thu, 12 Nov 2026 08:17:58 -0800 [thread overview]
Message-ID: <20261112081758.70426a67@phoenix.local> (raw)
In-Reply-To: <20261112153115.GA3255418@shredder>
On Thu, 12 Nov 2026 17:31:15 +0200
Ido Schimmel <idosch@nvidia.com> wrote:
> >
> > Return -EMSGSIZE in this case, as IPv4 does. This depends on the
> > rtnl_dumpit() fix in the previous patch.
> >
> > Fixes: beb1afac518d ("net: ipv6: Add support to dump multipath routes via RTA_MULTIPATH attribute")
> > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
>
> Reviewed-by: Ido Schimmel <idosch@nvidia.com>
>
> FWIW, given that "It takes some non real world stuff to do this", I
> think these patches can be routed via net-next.
The exaggerated security argument is that malicious root in network namespace
can do this and hide/crash ip commands and/or routing daemons in other namespace.
Once again the analyzer is stretching pretty far to argue that.
But then again with the current "lets chain $.01 vulnerabilities" world maybe not.
next prev parent reply other threads:[~2026-11-12 16:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20261110172925.3293312-1-stephen@networkplumber.org>
2026-11-10 17:26 ` [PATCH net v2 1/3] rtnetlink: return EMSGSIZE when first dump entry " Stephen Hemminger
2026-11-12 5:27 ` netdev-bot+sashiko
2026-11-12 15:31 ` Ido Schimmel
2026-11-10 17:26 ` [PATCH net v2 2/3] ipv6: return EMSGSIZE when first route in dump " Stephen Hemminger
2026-11-12 15:31 ` Ido Schimmel
2026-11-12 16:17 ` Stephen Hemminger [this message]
2026-11-10 17:26 ` [PATCH net v2 3/3] selftests: net: netlink-dumps: test dump of route larger than skb Stephen Hemminger
2026-11-12 5:27 ` netdev-bot+sashiko
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