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Date:	Sun, 30 Mar 2014 14:47:23 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Mathias Krause <minipli@...glemail.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, PaX Team <pageexec@...email.hu>,
	Nadia Derbey <Nadia.Derbey@...l.net>,
	Manfred Spraul <manfred@...orfullife.com>
Subject: Re: [PATCH] ipc: constify ipc_ops

On Sun, 2014-03-30 at 15:35 +0200, Mathias Krause wrote:
> There is no need to recreate the very same ipc_ops structure on every
> kernel entry for msgget/semget/shmget. Just declare it static and be
> done with it.
> While at it, constify it as we don't modify the structure at runtime.

Seems reasonable.

> 
> Found in the PaX patch, written by the PaX Team.
> 
> Cc: PaX Team <pageexec@...email.hu>
> Cc: Nadia Derbey <Nadia.Derbey@...l.net>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Mathias Krause <minipli@...glemail.com>

In the future, for ipc changes, please CC me and Manfred as well.

One comment below, otherwise:
Acked-by: Davidlohr Bueso <davidlohr@...com>

> ---
>  ipc/msg.c  |    9 ++++-----
>  ipc/sem.c  |   10 +++++-----
>  ipc/shm.c  |   10 +++++-----
>  ipc/util.c |    8 ++++----
>  ipc/util.h |    2 +-
>  5 files changed, 19 insertions(+), 20 deletions(-)
> 
> diff --git a/ipc/msg.c b/ipc/msg.c
> index 649853105a..35e4018de5 100644
> --- a/ipc/msg.c
> +++ b/ipc/msg.c
> @@ -306,15 +306,14 @@ static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
>  SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
>  {
>  	struct ipc_namespace *ns;
> -	struct ipc_ops msg_ops;
> +	static const struct ipc_ops msg_ops = {
> +		.getnew = newque,
> +		.associate = msg_security,

For completeness, please add .more_checks = NULL as well.

> +	};
>  	struct ipc_params msg_params;
>  
>  	ns = current->nsproxy->ipc_ns;
>  
> -	msg_ops.getnew = newque;
> -	msg_ops.associate = msg_security;
> -	msg_ops.more_checks = NULL;
> -
>  	msg_params.key = key;
>  	msg_params.flg = msgflg;
>  
> diff --git a/ipc/sem.c b/ipc/sem.c
> index bee5554173..3fcbc96abe 100644
> --- a/ipc/sem.c
> +++ b/ipc/sem.c
> @@ -564,7 +564,11 @@ static inline int sem_more_checks(struct kern_ipc_perm *ipcp,
>  SYSCALL_DEFINE3(semget, key_t, key, int, nsems, int, semflg)
>  {
>  	struct ipc_namespace *ns;
> -	struct ipc_ops sem_ops;
> +	static const struct ipc_ops sem_ops = {
> +		.getnew = newary,
> +		.associate = sem_security,
> +		.more_checks = sem_more_checks,
> +	};
>  	struct ipc_params sem_params;
>  
>  	ns = current->nsproxy->ipc_ns;
> @@ -572,10 +576,6 @@ SYSCALL_DEFINE3(semget, key_t, key, int, nsems, int, semflg)
>  	if (nsems < 0 || nsems > ns->sc_semmsl)
>  		return -EINVAL;
>  
> -	sem_ops.getnew = newary;
> -	sem_ops.associate = sem_security;
> -	sem_ops.more_checks = sem_more_checks;
> -
>  	sem_params.key = key;
>  	sem_params.flg = semflg;
>  	sem_params.u.nsems = nsems;
> diff --git a/ipc/shm.c b/ipc/shm.c
> index 76459616a7..b54c93f6d1 100644
> --- a/ipc/shm.c
> +++ b/ipc/shm.c
> @@ -609,15 +609,15 @@ static inline int shm_more_checks(struct kern_ipc_perm *ipcp,
>  SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg)
>  {
>  	struct ipc_namespace *ns;
> -	struct ipc_ops shm_ops;
> +	static const struct ipc_ops shm_ops = {
> +		.getnew = newseg,
> +		.associate = shm_security,
> +		.more_checks = shm_more_checks,
> +	};
>  	struct ipc_params shm_params;
>  
>  	ns = current->nsproxy->ipc_ns;
>  
> -	shm_ops.getnew = newseg;
> -	shm_ops.associate = shm_security;
> -	shm_ops.more_checks = shm_more_checks;
> -
>  	shm_params.key = key;
>  	shm_params.flg = shmflg;
>  	shm_params.u.size = size;
> diff --git a/ipc/util.c b/ipc/util.c
> index e1b4c6db8a..314ebeb3d7 100644
> --- a/ipc/util.c
> +++ b/ipc/util.c
> @@ -317,7 +317,7 @@ int ipc_addid(struct ipc_ids *ids, struct kern_ipc_perm *new, int size)
>   * when the key is IPC_PRIVATE.
>   */
>  static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids,
> -		struct ipc_ops *ops, struct ipc_params *params)
> +		const struct ipc_ops *ops, struct ipc_params *params)
>  {
>  	int err;
>  
> @@ -344,7 +344,7 @@ static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids,
>   */
>  static int ipc_check_perms(struct ipc_namespace *ns,
>  			   struct kern_ipc_perm *ipcp,
> -			   struct ipc_ops *ops,
> +			   const struct ipc_ops *ops,
>  			   struct ipc_params *params)
>  {
>  	int err;
> @@ -375,7 +375,7 @@ static int ipc_check_perms(struct ipc_namespace *ns,
>   * On success, the ipc id is returned.
>   */
>  static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,
> -		struct ipc_ops *ops, struct ipc_params *params)
> +		const struct ipc_ops *ops, struct ipc_params *params)
>  {
>  	struct kern_ipc_perm *ipcp;
>  	int flg = params->flg;
> @@ -678,7 +678,7 @@ out:
>   * Common routine called by sys_msgget(), sys_semget() and sys_shmget().
>   */
>  int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
> -			struct ipc_ops *ops, struct ipc_params *params)
> +			const struct ipc_ops *ops, struct ipc_params *params)
>  {
>  	if (params->key == IPC_PRIVATE)
>  		return ipcget_new(ns, ids, ops, params);
> diff --git a/ipc/util.h b/ipc/util.h
> index 9c47d6f6c7..e1153ad574 100644
> --- a/ipc/util.h
> +++ b/ipc/util.h
> @@ -201,7 +201,7 @@ static inline bool ipc_valid_object(struct kern_ipc_perm *perm)
>  
>  struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id);
>  int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
> -			struct ipc_ops *ops, struct ipc_params *params);
> +			const struct ipc_ops *ops, struct ipc_params *params);
>  void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
>  		void (*free)(struct ipc_namespace *, struct kern_ipc_perm *));
>  #endif


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