linux-kernel - Re: scripts/selinux build error in 4.14 after glibc update

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Date:   Mon, 29 Apr 2019 10:02:29 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Sasha Levin <sashal@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Eric Paris <eparis@...isplace.org>, selinux@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Nicolas Iooss <nicolas.iooss@....org>
Subject: Re: scripts/selinux build error in 4.14 after glibc update

On Mon, Apr 29, 2019 at 8:40 AM Greg KH <gregkh@...uxfoundation.org> wrote:
> On Tue, Apr 23, 2019 at 09:43:09AM -0400, Paul Moore wrote:
> > On Tue, Apr 23, 2019 at 9:29 AM Sasha Levin <sashal@...nel.org> wrote:
> > > On Mon, Apr 22, 2019 at 09:59:47PM -0400, Paul Moore wrote:
> > > >On Mon, Apr 22, 2019 at 5:00 PM Nathan Chancellor
> > > ><natechancellor@...il.com> wrote:
> > > >> Hi all,
> > > >>
> > > >> After a glibc update to 2.29, my 4.14 builds started failing like so:
> > > >
> > > >...
> > > >
> > > >>   HOSTCC  scripts/selinux/genheaders/genheaders
> > > >> In file included from scripts/selinux/genheaders/genheaders.c:19:
> > > >> ./security/selinux/include/classmap.h:245:2: error: #error New address family defined, please update secclass_map.
> > > >>  #error New address family defined, please update secclass_map.
> > > >>   ^~~~~
> > > >
> > > >This is a known problem that has a fix in the selinux/next branch and
> > > >will be going up to Linus during the next merge window.  The fix is
> > > >quite small and should be relatively easy for you to backport to your
> > > >kernel build if you are interested; the patch can be found at the
> > > >archive link below:
> > > >
> > > >https://lore.kernel.org/selinux/20190225005528.28371-1-paulo@paulo.ac
> > >
> > > Why is it waiting for the next merge window? It fixes a build bug that
> > > people hit.
> >
> > I place a reasonably high bar on patches that I send up to Linus
> > outside of the merge window and I didn't feel this patch met that
> > criteria.  Nathan is only the second person I've seen who has
> > encountered this problem, the first being the original patch author.
> > As far as I've seen, the problem is only seen by users building older
> > kernels on very new userspaces (e.g. glibc v2.29 was released in
> > February 2019, Linux v4.14 was released in 2017); this doesn't appear
> > to be a large group of people and I didn't want to risk breaking the
> > main kernel tree during the -rcX phase for such a small group.
>
> Ugh, this breaks my local builds, I would recommend getting it to Linus
> sooner please.

Well, we are at -rc7 right now and it looks like an -rc8 is unlikely
so the question really comes down to can/do you want to wait a week?

-- 
paul moore
www.paul-moore.com