linux-kernel - Re: regression in 4.14-rc2 caused by apparmor: add base infastructure for socket mediation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 02 Oct 2017 22:15:07 -0700
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     John Johansen <john.johansen@...onical.com>,
        Seth Arnold <seth.arnold@...onical.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: regression in 4.14-rc2 caused by apparmor: add base
 infastructure for socket mediation

On Mon, 2017-10-02 at 21:11 -0700, John Johansen wrote:
> On 10/02/2017 09:02 PM, James Bottomley wrote:
> > 
> > The specific problem is that dnsmasq refuses to start on openSUSE
> > Leap 42.2.  The specific cause is that and attempt to open a
> > PF_LOCAL socket gets EACCES.  This means that networking doesn't
> > function on a system with a 4.14-rc2 system.
> > 
> > Reverting commit 651e28c5537abb39076d3949fb7618536f1d242e
> > (apparmor: add base infastructure for socket mediation) causes the
> > system to function again.
> > 
> 
> This is not a kernel regression,

Regression means something that worked in a previous version of the
kernel which is broken now. This problem falls within that definition.

>  it is because  opensuse dnsmasque is starting with policy that
> doesn't allow access to PF_LOCAL socket

Because there was no co-ordination between their version of the patch
and yours.  If you're sending in patches that you know might break
systems because they need a co-ordinated rollout of something in
userspace then it would be nice if you could co-ordinate it ...

Doing it in the merge window and not in -rc2 would also be helpful
because I have more expectation of a userspace mismatch from stuff in
the merge window.

> Christian Boltz the opensuse apparmor maintainer has been working
> on a policy update for opensuse see bug
> 
> https://bugzilla.opensuse.org/show_bug.cgi?id=1061195

Well, that looks really encouraging: The line about "To give you an
impression what "lots of" means - I had to adjust 40 profiles on my
laptop".  The upshot being apart from a bandaid, openSUSE still has no
co-ordinated fix for this.

James