linux-kernel - Re: [PATCH] Smack: setprocattr memory leak fix

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Date:	Thu, 23 Aug 2012 09:51:43 -0700
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	LSM <linux-security-module@...r.kernel.org>
CC:	Casey Schaufler <casey@...aufler-ca.com>,
	LKLM <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH] Smack: setprocattr memory leak fix

On 8/22/2012 11:44 AM, Casey Schaufler wrote:

> From: Casey Schaufler <casey@...aufler-ca.com>
> Subject: [PATCH] Smack: setprocattr memory leak fix
>
> The data structure allocations being done in prepare_creds
> are duplicated in smack_setprocattr. This results in the
> structure allocated in prepare_creds being orphaned and
> never freed. The duplicate code is removed from
> smack_setprocattr.
>
> Targeted for git://git.gitorious.org/smack-next/kernel.git
>
> Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>

Applied to git://git.gitorious.org/smack-next/kernel.git

 

>
> ---
>
>  security/smack/smack_lsm.c |   14 ++------------
>  1 files changed, 2 insertions(+), 12 deletions(-)
>
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index ce9273a..2874c73 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -2684,9 +2684,7 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value)
>  static int smack_setprocattr(struct task_struct *p, char *name,
>  			     void *value, size_t size)
>  {
> -	int rc;
>  	struct task_smack *tsp;
> -	struct task_smack *oldtsp;
>  	struct cred *new;
>  	char *newsmack;
>  
> @@ -2716,21 +2714,13 @@ static int smack_setprocattr(struct task_struct *p, char *name,
>  	if (newsmack == smack_known_web.smk_known)
>  		return -EPERM;
>  
> -	oldtsp = p->cred->security;
>  	new = prepare_creds();
>  	if (new == NULL)
>  		return -ENOMEM;
>  
> -	tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL);
> -	if (tsp == NULL) {
> -		kfree(new);
> -		return -ENOMEM;
> -	}
> -	rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL);
> -	if (rc != 0)
> -		return rc;
> +	tsp = new->security;
> +	tsp->smk_task = newsmack;
>  
> -	new->security = tsp;
>  	commit_creds(new);
>  	return size;
>  }
>
> --
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