linux-kernel - Re: [PATCH net] selinux: fix SCTP client peeloff socket labeling

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Message-ID: <CAFqZXNufe_7Nz6zayAGiJh-8xGw2cm=awhmVOp7hLLr5Ph72nQ@mail.gmail.com>
Date:   Fri, 12 Nov 2021 10:53:39 +0100
From:   Ondrej Mosnacek <omosnace@...hat.com>
To:     Paul Moore <paul@...l-moore.com>
Cc:     Jakub Kicinski <kuba@...nel.org>, Xin Long <lucien.xin@...il.com>,
        network dev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Richard Haines <richard_c_haines@...nternet.com>,
        Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        "linux-sctp @ vger . kernel . org" <linux-sctp@...r.kernel.org>,
        SElinux list <selinux@...r.kernel.org>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] selinux: fix SCTP client peeloff socket labeling

On Thu, Nov 11, 2021 at 4:44 PM Paul Moore <paul@...l-moore.com> wrote:
> On Thu, Nov 11, 2021 at 7:59 AM Ondrej Mosnacek <omosnace@...hat.com> wrote:
> > On Tue, Nov 9, 2021 at 4:00 PM Paul Moore <paul@...l-moore.com> wrote:
> > > On Tue, Nov 9, 2021 at 9:21 AM Jakub Kicinski <kuba@...nel.org> wrote:
> > > > On Thu,  4 Nov 2021 20:59:49 +0100 Ondrej Mosnacek wrote:
> > > > > As agreed with Xin Long, I'm posting this fix up instead of him. I am
> > > > > now fairly convinced that this is the right way to deal with the
> > > > > immediate problem of client peeloff socket labeling. I'll work on
> > > > > addressing the side problem regarding selinux_socket_post_create()
> > > > > being called on the peeloff sockets separately.
> > > >
> > > > IIUC Paul would like to see this part to come up in the same series.
> > >
> > > Just to reaffirm the IIUC part - yes, your understanding is correct.
> >
> > The more I'm reading these threads, the more I'm getting confused...
> > Do you insist on resending the whole original series with
> > modifications? Or actual revert patches + the new patches? Or is it
> > enough to revert/resend only the patches that need changes? Do you
> > also insist on the selinux_socket_post_create() thing to be fixed in
> > the same series? Note that the original patches are still in the
> > net.git tree and it doesn't seem like Dave will want to rebase them
> > away, so it seems explicit reverting is the only way to "respin" the
> > series...
>
> DaveM is stubbornly rejecting the revert requests so for now I would
> continue to base any patches on top of the netdev tree.  If that
> changes we can reconcile any changes as necessary, that should not be
> a major issue.
>
> As far as what I would like to see from the patches, ignoring the
> commit description vs cover letter discussion, I would like to see
> patches that fix all of the known LSM/SELinux/SCTP problems as have
> been discussed over the past couple of weeks.  Even beyond this
> particular issue I generally disapprove of partial fixes to known
> problems; I would rather see us sort out all of the issues in a single
> patchset so that we can review everything in a sane manner.  In this
> particular case things are a bit more complicated because of the
> current state of the patches in the netdev tree, but as mentioned
> above just treat the netdev tree as broken and base your patches on
> that with all of the necessary "Fixes:" metadata and the like.

Hm, okay, that isn't what I was branch-predicting from your other
responses, but works for me.

> > Regardless of the answers, this thing has rabbithole'd too much and
> > I'm already past my free cycles to dedicate to this, so I think it
> > will take me (and Xin) some time to prepare the corrected and
> > re-documented patches. Moreover, I think I realized how to to deal
> > with the peer_secid-vs.-multiple-assocs-on-one-socket problem that Xin
> > mentions in patch 4/4, fixing which can't really be split out into a
> > separate patch and will need some test coverage, so I don't think I
> > can rush this up at this point...
>
> It's not clear to me from your comments above if this is something you
> are currently working on, planning to work on soon, or giving up on in
> the near term.  Are we able to rely on you for a patchset to fix this
> or are you unable to see this through at this time?

I'm still working on it, but I'll need to juggle it with other things
now and I might need to defer it completely at some point. I don't
think I'll have all the patches ready sooner than two weeks from now.
My point was to explain that I'm unable to provide a proper fix in the
short term and don't want to block the netdev maintainers in case they
were waiting for this to get resolved before e.g. sending a PR to
Linus.

--
Ondrej Mosnacek
Software Engineer, Linux Security - SELinux kernel
Red Hat, Inc.