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Date: Sat, 26 Apr 2014 11:58:45 +0300
Message-ID: <CACE9dm_SreLw8976qu52tmnJ5dq_xruR5f1sp9VfJBieEk-=nw@mail.gmail.com>
Subject: Re: Kernel panic at Ubuntu: IMA + Apparmor
From: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@redhat.com>, Dmitry Kasatkin <d.kasatkin@samsung.com>,
        linux-security-module <linux-security-module@vger.kernel.org>,
        John Johansen <john.johansen@canonical.com>,
        Mimi Zohar <zohar@linux.vnet.ibm.com>,
        James Morris <jmorris@namei.org>, viro@zeniv.linux.org.uk,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        kernel-team <kernel-team@lists.ubuntu.com>
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Sender: linux-kernel-owner@vger.kernel.org

On 26 April 2014 01:38, Eric W. Biederman <ebiederm@xmission.com> wrote:
> Dmitry Kasatkin <dmitry.kasatkin@gmail.com> writes:
>
>> Is it really a show stopper to switch order of 2 functions as quick fix?
>> It was like that before 3.10 and seemed ok...
>
> When that is the question.  The answer is yes it is a show stopper.
>
> A quick fix to bury a fundamental design flaw because the code
> previously seemed ok.  That seems fundamentally wrong.
>
> Having IMA conflict with Apparmor in Kconfig would be a sensible quick
> fix.
>
> Eric

Conflict with Apparmor means with Ubuntu.

But answering to your early question..
IMA does not want permission denied when measuring and re-measuring files.
may_open() is doing that job before.

We need quickly introduce kernel_read without LSM checks...

-- 
Thanks,
Dmitry
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