Re: [PATCH net] netrom: do some basic forms of validation on incoming frames

Kuniyuki Iwashima
2026-04-10T22:12:22Z

From: Jakub Kicinski <kuba@kernel.org>
Date: Fri, 10 Apr 2026 14:54:48 -0700
> On Fri, 10 Apr 2026 14:30:42 -0700 Jakub Kicinski wrote:
> > 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:
> > > > 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.
>
> Well, either we "expunge" this code to OOT repos, or we mark it
> as broken and tell everyone that we don't take security fixes
> for anything that depends on BROKEN. I'd personally rather expunge.

+1 for "expunge" to prevent LLM-based patch flood.

IIRC, we did that recently for one driver only used by OpenWRT ?

>
> cc: workflows, we can't be the only ones still nursing Linux 2.2 code