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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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