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Message-ID: <20220908214859.GD16543@breakpoint.cc> Date: Thu, 8 Sep 2022 23:48:59 +0200 From: Florian Westphal <fw@...len.de> To: Chris Clayton <chris2553@...glemail.com> Cc: Florian Westphal <fw@...len.de>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Pablo Neira Ayuso <pablo@...filter.org> Subject: Re: b118509076b3 (probably) breaks my firewall Chris Clayton <chris2553@...glemail.com> wrote: [ CC Pablo ] > On 08/09/2022 20:19, Florian Westphal wrote: > > Chris Clayton <chris2553@...glemail.com> wrote: > >> Just a heads up and a question... > >> > >> I've pulled the latest and greatest from Linus' tree and built and installed the kernel. git describe gives > >> v6.0-rc4-126-g26b1224903b3. > >> > >> I find that my firewall is broken because /proc/sys/net/netfilter/nf_conntrack_helper no longer exists. It existed on an > >> -rc4 kernel. Are changes like this supposed to be introduced at this stage of the -rc cycle? > > > > The problem is that the default-autoassign (nf_conntrack_helper=1) has > > side effects that most people are not aware of. > > > > The bug that propmpted this toggle from getting axed was that the irc (dcc) helper allowed > > a remote client to create a port forwarding to the local client. > > > Ok, but I still think it's not the sort of change that should be introduced at this stage of the -rc cycle. > The other problem is that the documentation (Documentation/networking/nf_conntrack-sysctl.rst) hasn't been updated. So I > know my firewall is broken but there's nothing I can find that tells me how to fix it. Pablo, I don't think revert+move the 'next' will avoid this kinds of problems, but at least the nf_conntrack-sysctl.rst should be amended to reflect that this was removed. I'd keep it though because people that see an error wrt. this might be looking at nf_conntrack-sysctl.rst. Maybe just a link to https://home.regit.org/netfilter-en/secure-use-of-helpers/? What do you think?
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