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

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Message-ID: <20140425200156.GA13727@redhat.com>
Date:	Fri, 25 Apr 2014 22:01:56 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Dmitry Kasatkin <d.kasatkin@...sung.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	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@...ts.ubuntu.com
Subject: Re: Kernel panic at Ubuntu: IMA + Apparmor

On 04/25, Eric W. Biederman wrote:
>
> Oleg Nesterov <oleg@...hat.com> writes:
>
> > Well. I _think_ that __fput() and ima_file_free() in particular should not
> > depend on current and/or current->nsproxy. If nothing else, fput() can be
> > called by the unrelated task which looks into /proc/pid/.
> >
> > But again, task_work_add() has more and more users, and it seems that even
> > __fput() paths can do "everything", so perhaps it would be safer to allow
> > to use ->nsproxy in task_work_run.
>
> Like I said, give me a clear motivating case.

I agree, we need a reason. Currently I do not see one.

> Right now not allowing
> nsproxy is turning up bugs in __fput.  Which seems like a good thing.

This is what I certainly agree with ;)

Oleg.

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