linux-kernel - Re: Kernel panic at Ubuntu: IMA + Apparmor

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Date:	Sat, 26 Apr 2014 11:58:45 +0300
From:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Dmitry Kasatkin <d.kasatkin@...sung.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	John Johansen <john.johansen@...onical.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	James Morris <jmorris@...ei.org>, viro@...iv.linux.org.uk,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kernel-team <kernel-team@...ts.ubuntu.com>
Subject: Re: Kernel panic at Ubuntu: IMA + Apparmor

On 26 April 2014 01:38, Eric W. Biederman <ebiederm@...ssion.com> wrote:
> Dmitry Kasatkin <dmitry.kasatkin@...il.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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