linux-kernel - Re: [REGRESSION] AppArmor module parameter layout changed with c5459b829b716

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] [day] [month] [year] [list]

Message-ID: <CAGXu5jL8ijV8AXLeeakvP7iXeYGSgyVWOUw+Mp_M0oxL7jf0ZA@mail.gmail.com>
Date:   Mon, 8 Apr 2019 08:02:51 -0700
From:   Kees Cook <keescook@...omium.org>
To:     David Rheinsberg <david.rheinsberg@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        John Johansen <john.johansen@...onical.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [REGRESSION] AppArmor module parameter layout changed with c5459b829b716

On Mon, Apr 8, 2019 at 12:21 AM David Rheinsberg
<david.rheinsberg@...il.com> wrote:
>
> Hi
>
> A recent commit changed how `/sys/module/apparmor/parameters/enabled`
> looks. It was "Y"/"N" before, now it is an integer. I *think* the
> commit that changed this was:

Oooh... the _output_ appears differently based on the type. Argh. Let
me work something up...

> commit c5459b829b716dafd226ad270f25c9a3050f7586
> Author: Kees Cook <keescook@...omium.org>
> Date:   Thu Sep 13 22:28:48 2018 -0700
>
>     LSM: Plumb visibility into optional "enabled" state
>
> I haven't recompiled with a revert, but changing the module-parameter
> type looks like the obvious culprit. I don't see how this change can
> be safe?
>
> This breaks the AppArmor detection of `dbus-broker`. Can the commit be reverted?

Thanks for catching this!

-- 
Kees Cook