From eb66ec44f867834de054544b09b573de3a7ae456 Mon Sep 17 00:00:00 2001 From: Mathias Krause Date: Fri, 6 Jun 2014 14:37:36 -0700 Subject: [PATCH] ipc: constify ipc_ops 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. Found in the PaX patch, written by the PaX Team. Signed-off-by: Mathias Krause Cc: PaX Team Cc: Davidlohr Bueso Cc: Manfred Spraul Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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 649853105a5d..35e4018de53c 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, + }; 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 bee555417312..3fcbc96abee9 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 76459616a7fa..b54c93f6d117 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 2eb0d1eaa312..9b3fa38afe2c 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 @@ struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id) * 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 9c47d6f6c7b4..e1153ad574b7 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 -- GitLab