linux-kernel - Re: [PATCHv2] Smack: add support for modification of existing rules

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Message-ID: <1357908362.4146.23.camel@falcor>
Date:	Fri, 11 Jan 2013 07:46:02 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Rafal Krypa <r.krypa@...sung.com>
Cc:	Casey Schaufler <casey@...aufler-ca.com>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCHv2] Smack: add support for modification of existing rules

On Thu, 2013-01-10 at 19:42 +0100, Rafal Krypa wrote:
> Rule modifications are enabled via /smack/change-rule. Format is as follows:
> "Subject Object rwaxt rwaxt"
> 
> First two strings are subject and object labels up to 255 characters.
> Third string contains permissions to enable.
> Fourth string contains permissions to disable.
> 
> All unmentioned permissions will be left unchanged.
> If no rule previously existed, it will be created.

Changing rules on a running system could affect IMA, if the IMA policy
contains LSM based rules.  Patch "[PATCH 1/9] ima: re-initialize IMA
policy LSM info" addresses this issue.  It assumes existing LSM rules
have not been dropped.

thanks,

Mimi

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