linux-kernel - Re: [PATCH BUGFIX -rc5] Smack: Do not dereference NULL ipc object

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Date:	Wed, 19 Mar 2008 16:27:56 -0700 (PDT)
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	"Ahmed S. Darwish" <darwish.07@...il.com>,
	Casey Schaufler <casey@...aufler-ca.com>,
	akpm <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH BUGFIX -rc5] Smack: Do not dereference NULL ipc object


--- "Ahmed S. Darwish" <darwish.07@...il.com> wrote:

> Hi all,
> 
> In the SYSV ipc msgctl(),semctl(),shmctl() family, if the user passed
> *_INFO as the desired operation, no specific object is meant to be 
> controlled and only system-wide information is returned. This leads
> to a NULL IPC object in the LSM hooks if the _INFO flag is given.
> 
> Avoid dereferencing this NULL pointer in Smack ipc *ctl() methods.
> 
> Signed-off-by: Ahmed S. Darwish <darwish.07@...il.com>

Acked-by: Casey Schaufler <casey@...aufler-ca.com>

Sorry, somehow I thought I'd acked this some time ago.

> ---
> 
>  smack_lsm.c |    9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index 0241fd3..38d7075 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -1508,7 +1508,7 @@ static int smack_shm_associate(struct shmid_kernel
> *shp, int shmflg)
>   */
>  static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
>  {
> -	char *ssp = smack_of_shm(shp);
> +	char *ssp;
>  	int may;
>  
>  	switch (cmd) {
> @@ -1532,6 +1532,7 @@ static int smack_shm_shmctl(struct shmid_kernel *shp,
> int cmd)
>  		return -EINVAL;
>  	}
>  
> +	ssp = smack_of_shm(shp);
>  	return smk_curacc(ssp, may);
>  }
>  
> @@ -1616,7 +1617,7 @@ static int smack_sem_associate(struct sem_array *sma,
> int semflg)
>   */
>  static int smack_sem_semctl(struct sem_array *sma, int cmd)
>  {
> -	char *ssp = smack_of_sem(sma);
> +	char *ssp;
>  	int may;
>  
>  	switch (cmd) {
> @@ -1645,6 +1646,7 @@ static int smack_sem_semctl(struct sem_array *sma, int
> cmd)
>  		return -EINVAL;
>  	}
>  
> +	ssp = smack_of_sem(sma);
>  	return smk_curacc(ssp, may);
>  }
>  
> @@ -1730,7 +1732,7 @@ static int smack_msg_queue_associate(struct msg_queue
> *msq, int msqflg)
>   */
>  static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
>  {
> -	char *msp = smack_of_msq(msq);
> +	char *msp;
>  	int may;
>  
>  	switch (cmd) {
> @@ -1752,6 +1754,7 @@ static int smack_msg_queue_msgctl(struct msg_queue
> *msq, int cmd)
>  		return -EINVAL;
>  	}
>  
> +	msp = smack_of_msq(msq);
>  	return smk_curacc(msp, may);
>  }
>  
> Regards,
> 
> -- 
> 
> "Better to light a candle, than curse the darkness"
> 
> Ahmed S. Darwish
> Homepage: http://darwish.07.googlepages.com
> Blog: http://darwish-07.blogspot.com
> 
> --
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> 
> 
> 


Casey Schaufler
casey@...aufler-ca.com
--
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