linux-kernel - Re: [PATCH v4 3/3] LSM: Add context interface for proc attrs

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Date:	Fri, 24 Jun 2016 15:15:47 -0400
From:	Paul Moore <paul@...l-moore.com>
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	LSM <linux-security-module@...r.kernel.org>,
	James Morris <jmorris@...ei.org>,
	John Johansen <john.johansen@...onical.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Kees Cook <keescook@...omium.org>,
	LKLM <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3/3] LSM: Add context interface for proc attrs

On Thu, Jun 23, 2016 at 5:11 PM, Casey Schaufler <casey@...aufler-ca.com> wrote:
> Subject: [PATCH v4 3/3] LSM: Add context interface for proc attrs
>
> The /proc/.../attr/current interface is used by all three
> Linux security modules (SELinux, Smack and AppArmor) to
> report and modify the process security attribute. This is
> all fine when there is exactly one of these modules active
> and the userspace code knows which it module it is.
> It would require a major change to the "current" interface
> to provide information about more than one set of process
> security attributes. Instead, a "context" attribute is
> added, which identifies the security module that the
> information applies to. The format is:
>
>         lsmname='context-value'
>
> When multiple concurrent modules are supported the
> /proc/.../attr/context interface will include the data
> for all of the active modules.
>
>         lsmname1='context-value1'lsmname2='context-value2'
>
> The module specific subdirectories under attr contain context
> entries that report the information for that specific module
> in the same format.

I think a delimiter between the different LSMs would be a good idea.
A comma seems like a safe choice at the moment.

-- 
paul moore
www.paul-moore.com