linux-kernel - Re: [PATCH 2/2] AppArmor: Fix masking of capabilities in complain mode

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Date:	Tue, 28 Jun 2011 21:24:40 -0700
From:	Greg KH <greg@...ah.com>
To:	John Johansen <john.johansen@...onical.com>
Cc:	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 2/2] AppArmor: Fix masking of capabilities in complain
 mode

On Wed, Jun 29, 2011 at 02:44:34AM +0100, John Johansen wrote:
> AppArmor is masking the capabilities returned by capget against the
> capabilities mask in the profile.  This is wrong, in complain mode the
> profile has effectively all capabilities, as the profile restrictions are
> not being enforced, merely tested against to determine if an access is
> known by the profile.
> 
> This can result in the wrong behavior of security conscience applications
> like sshd which examine their capability set, and change their behavior
> accordingly.  In this case because of the masked capability set being
> returned sshd fails due to DAC checks, even when the profile is in complain
> mode.
> 
> Kernels affected: 2.6.36 - 3.0.
> 
> Signed-off-by: John Johansen <john.johansen@...onical.com>
> ---

You say that multiple kernels are affected, then why not also include
stable@...nel.org here as well?

confused,

greg k-h
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