linux-kernel - Re: AppArmor Security Goal

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Date:	Sat, 10 Nov 2007 22:04:35 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Crispin Cowan <crispin@...spincowan.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	LSM ML <linux-security-module@...r.kernel.org>,
	apparmor-dev <apparmor-dev@...ge.novell.com>
Subject: Re: AppArmor Security Goal

Crispin Cowan <crispin@...spincowan.com> writes:

The document should be a good base for a merge.

>     * A confined process can operate on a file descriptor passed to it
>       by an unconfined process, even if it manipulates a file not in the
>       confined process's profile. To block this attack, confine the
>       process that passed the file descriptor.

That is the only thing that tripped me up a bit while reading the document.
Can you expand a bit on the reasons why the fd is not rechecked in
the context of the target process? Best do it in a new version of the
document.

-Andi
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