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Date: Fri, 10 Apr 2026 14:30:42 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Simon Horman <horms@kernel.org>, netdev@vger.kernel.org,
 linux-kernel@vger.kernel.org, "David S. Miller" <davem@davemloft.net>, Eric
 Dumazet <edumazet@google.com>, Paolo Abeni <pabeni@redhat.com>,
 linux-hams@vger.kernel.org, Yizhe Zhuang <yizhe@darknavy.com>, stable
 <stable@kernel.org>
Subject: Re: [PATCH net] netrom: do some basic forms of validation on
 incoming frames
Message-ID: <20260410143042.1d4436de@kernel.org>
In-Reply-To: <2026041026-excuse-slashing-c4ee@gregkh>
References: <2026040730-untagged-groin-bbb7@gregkh>
	<20260409190328.GS469338@kernel.org>
	<20260409203235.6b9329f0@kernel.org>
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On Fri, 10 Apr 2026 07:24:36 +0200 Greg Kroah-Hartman wrote:
> On Thu, Apr 09, 2026 at 08:32:35PM -0700, Jakub Kicinski wrote:
> > On Thu, 9 Apr 2026 20:03:28 +0100 Simon Horman wrote:  
> > > I expect that checking skb->len isn't sufficient here
> > > and pskb_may_pull needs to be used to ensure that
> > > the data is also available in the linear section of the skb.  
> > 
> > Or for simplicity we could also be testing against skb_headlen()
> > since we don't expect any legit non-linear frames here? Dunno.  
> 
> I'll be glad to change this either way, your call.  Given that this is
> an obsolete protocol that seems to only be a target for drive-by fuzzers
> to attack, whatever the simplest thing to do to quiet them up I'll be
> glad to implement.
> 
> Or can we just delete this stuff entirely?  :)

Yes.

My thinking is to delete hamradio, nfc, atm, caif.. [more to come]
Create GH repos which provide them as OOT modules.
Hopefully we can convince any existing users to switch to that.

The only thing stopping me is the concern that this is just the softest
target and the LLMs will find something else to focus on which we can't
delete. I suspect any PCIe driver can be flooded with "aren't you
trusting the HW to provide valid responses here?" bullshit.

But hey, let's try. I'll post a patch nuking all of hamradio later
today.