linux-kernel - Re: [PATCH] Smack: prevent revoke-subject from failing when unseen label is written to it

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Date:	Tue, 27 Nov 2012 09:22:57 -0800
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Rafal Krypa <r.krypa@...sung.com>
CC:	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH] Smack: prevent revoke-subject from failing when unseen
 label is written to it

On 11/27/2012 7:28 AM, Rafal Krypa wrote:
> Special file /smack/revoke-subject will silently accept labels that are not
> present on the subject label list. Nothing has to be done for such labels,
> as there are no rules for them to revoke.
>
> Targeted for git://git.gitorious.org/smack-next/kernel.git

I will queue this for 3.9 as I've just submitted the 3.8 Smack
changes.

>
> Signed-off-by: Rafal Krypa <r.krypa@...sung.com>
> ---
>  security/smack/smackfs.c |    4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
> index 76a5dca..337e32c 100644
> --- a/security/smack/smackfs.c
> +++ b/security/smack/smackfs.c
> @@ -2035,10 +2035,8 @@ static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
>  	}
>  
>  	skp = smk_find_entry(cp);
> -	if (skp == NULL) {
> -		rc = -EINVAL;
> +	if (skp == NULL)
>  		goto free_out;
> -	}
>  
>  	rule_list = &skp->smk_rules;
>  	rule_lock = &skp->smk_rules_lock;

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