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From: Willy Tarreau <w@1wt.eu>
To: shaos <shawnq1@163.com>
Cc: jhs@mojatatu.com, Jiri Pirko <jiri@resnulli.us>,
	"David S . Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Simon Horman <horms@kernel.org>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	security@kernel.org
Subject: Re: [BUG] net/sched: TEQL qdisc can modify init-net teql0 from another netns
Date: Thu, 22 Oct 2026 18:24:41 +0200	[thread overview]
Message-ID: <ato4yRBZ6iz-F77o@1wt.eu> (raw)
In-Reply-To: <20261022144830.67948-1-shawnq1@163.com>

Hello,

On Thu, Oct 22, 2026 at 02:48:30PM +0000, shaos wrote:
> Hello,
> 
> A process running as UID/GID 65534 creates a user and network namespace, sets
> a namespace-local dummy device to MTU 60000, and installs a root qdisc of
> kind teql0. TEQL reuses its global master and changes the init network
> namespace teql0 device from MTU 1500 to 60000.
(...)

I know this was mentioned elsewhere, but since you're sending so many
reports at once:

   please oh please stop CCing the security list for messages that
   you're already sending to public lists. It serves no purposes
   and adds extra work for several of us (review, triage, response).

Ccing the security list for a public message won't get your message
handled faster and might even cause the opposite by showing that you
don't read docs and seem to post in a hurry.

Thanks,
Willy

      reply	other threads:[~2026-10-22 16:24 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-22 14:48 shaos
2026-10-22 16:24 ` Willy Tarreau [this message]

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