linux-kernel - Re: [PATCH v4 4/9] devcg: expand may

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Date:	Wed, 30 Jan 2013 20:09:20 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	aris@...hat.com
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	Tejun Heo <tj@...nel.org>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH v4 4/9] devcg: expand may_access() logic

Quoting aris@...hat.com (aris@...hat.com):
> In order to make the next patch more clear, expand may_access() logic.
> 
> v2: may_access() returns bool now
> 
> Acked-by: Tejun Heo <tj@...nel.org>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Serge Hallyn <serge.hallyn@...onical.com>

Acked-by: Serge Hallyn <serge.hallyn@...onical.com>

> Signed-off-by: Aristeu Rozanski <aris@...hat.com>
> 
> ---
>  security/device_cgroup.c |   21 ++++++++++++---------
>  1 file changed, 12 insertions(+), 9 deletions(-)
> 
> --- github.orig/security/device_cgroup.c	2013-01-30 08:56:29.532063723 -0500
> +++ github/security/device_cgroup.c	2013-01-30 08:58:02.934460404 -0500
> @@ -355,8 +355,8 @@ 	return 0;
>   * @dev_cgroup: dev cgroup to be tested against
>   * @refex: new exception
>   */
> -static int may_access(struct dev_cgroup *dev_cgroup,
> -		      struct dev_exception_item *refex)
> +static bool may_access(struct dev_cgroup *dev_cgroup,
> +		       struct dev_exception_item *refex)
>  {
>  	struct dev_exception_item *ex;
>  	bool match = false;
> @@ -382,16 +382,19 @@ 		if (ex->minor != ~0 && ex->minor != re
>  
>  	/*
>  	 * In two cases we'll consider this new exception valid:
> -	 * - the dev cgroup has its default policy to allow + exception list:
> -	 *   the new exception should *not* match any of the exceptions
> -	 *   (behavior == DEVCG_DEFAULT_ALLOW, !match)
>  	 * - the dev cgroup has its default policy to deny + exception list:
>  	 *   the new exception *should* match the exceptions
> -	 *   (behavior == DEVCG_DEFAULT_DENY, match)
> +	 * - the dev cgroup has its default policy to allow + exception list:
> +	 *   the new exception should *not* match any of the exceptions
>  	 */
> -	if ((dev_cgroup->behavior == DEVCG_DEFAULT_DENY) == match)
> -		return 1;
> -	return 0;
> +	if (dev_cgroup->behavior == DEVCG_DEFAULT_DENY) {
> +		if (match)
> +			return true;
> +	} else {
> +		if (!match)
> +			return true;
> +	}
> +	return false;
>  }
>  
>  /*
> 
> --
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