IPC: get rid of the use *_setbuf structure.
Pierre Peiffer [Tue, 29 Apr 2008 08:00:50 +0000 (01:00 -0700)]
All IPCs make use of an intermetiate *_setbuf structure to handle the IPC_SET
command.  This is not really needed and, moreover, it complicates a little bit
the code.

This patch gets rid of the use of it and uses directly the semid64_ds/
msgid64_ds/shmid64_ds structure.

In addition of removing one struture declaration, it also simplifies and
improves a little bit the common 64-bits path.

Signed-off-by: Pierre Peiffer <pierre.peiffer@bull.net>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Nadia Derbey <Nadia.Derbey@bull.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

ipc/msg.c
ipc/sem.c
ipc/shm.c

index 9d868b3..80375bf 100644 (file)
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -388,31 +388,14 @@ copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
        }
 }
 
-struct msq_setbuf {
-       unsigned long   qbytes;
-       uid_t           uid;
-       gid_t           gid;
-       mode_t          mode;
-};
-
 static inline unsigned long
-copy_msqid_from_user(struct msq_setbuf *out, void __user *buf, int version)
+copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version)
 {
        switch(version) {
        case IPC_64:
-       {
-               struct msqid64_ds tbuf;
-
-               if (copy_from_user(&tbuf, buf, sizeof(tbuf)))
+               if (copy_from_user(out, buf, sizeof(*out)))
                        return -EFAULT;
-
-               out->qbytes             = tbuf.msg_qbytes;
-               out->uid                = tbuf.msg_perm.uid;
-               out->gid                = tbuf.msg_perm.gid;
-               out->mode               = tbuf.msg_perm.mode;
-
                return 0;
-       }
        case IPC_OLD:
        {
                struct msqid_ds tbuf_old;
@@ -420,14 +403,14 @@ copy_msqid_from_user(struct msq_setbuf *out, void __user *buf, int version)
                if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
                        return -EFAULT;
 
-               out->uid                = tbuf_old.msg_perm.uid;
-               out->gid                = tbuf_old.msg_perm.gid;
-               out->mode               = tbuf_old.msg_perm.mode;
+               out->msg_perm.uid       = tbuf_old.msg_perm.uid;
+               out->msg_perm.gid       = tbuf_old.msg_perm.gid;
+               out->msg_perm.mode      = tbuf_old.msg_perm.mode;
 
                if (tbuf_old.msg_qbytes == 0)
-                       out->qbytes     = tbuf_old.msg_lqbytes;
+                       out->msg_qbytes = tbuf_old.msg_lqbytes;
                else
-                       out->qbytes     = tbuf_old.msg_qbytes;
+                       out->msg_qbytes = tbuf_old.msg_qbytes;
 
                return 0;
        }
@@ -445,12 +428,12 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
                       struct msqid_ds __user *buf, int version)
 {
        struct kern_ipc_perm *ipcp;
-       struct msq_setbuf setbuf;
+       struct msqid64_ds msqid64;
        struct msg_queue *msq;
        int err;
 
        if (cmd == IPC_SET) {
-               if (copy_msqid_from_user(&setbuf, buf, version))
+               if (copy_msqid_from_user(&msqid64, buf, version))
                        return -EFAULT;
        }
 
@@ -468,8 +451,10 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
                goto out_unlock;
 
        if (cmd == IPC_SET) {
-               err = audit_ipc_set_perm(setbuf.qbytes, setbuf.uid, setbuf.gid,
-                                        setbuf.mode);
+               err = audit_ipc_set_perm(msqid64.msg_qbytes,
+                                        msqid64.msg_perm.uid,
+                                        msqid64.msg_perm.gid,
+                                        msqid64.msg_perm.mode);
                if (err)
                        goto out_unlock;
        }
@@ -491,18 +476,18 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
                freeque(ns, ipcp);
                goto out_up;
        case IPC_SET:
-               if (setbuf.qbytes > ns->msg_ctlmnb &&
+               if (msqid64.msg_qbytes > ns->msg_ctlmnb &&
                    !capable(CAP_SYS_RESOURCE)) {
                        err = -EPERM;
                        goto out_unlock;
                }
 
-               msq->q_qbytes = setbuf.qbytes;
+               msq->q_qbytes = msqid64.msg_qbytes;
 
-               ipcp->uid = setbuf.uid;
-               ipcp->gid = setbuf.gid;
+               ipcp->uid = msqid64.msg_perm.uid;
+               ipcp->gid = msqid64.msg_perm.gid;
                ipcp->mode = (ipcp->mode & ~S_IRWXUGO) |
-                            (S_IRWXUGO & setbuf.mode);
+                            (S_IRWXUGO & msqid64.msg_perm.mode);
                msq->q_ctime = get_seconds();
                /* sleeping receivers might be excluded by
                 * stricter permissions.
index db161de..df98de2 100644 (file)
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -835,28 +835,14 @@ out_free:
        return err;
 }
 
-struct sem_setbuf {
-       uid_t   uid;
-       gid_t   gid;
-       mode_t  mode;
-};
-
-static inline unsigned long copy_semid_from_user(struct sem_setbuf *out, void __user *buf, int version)
+static inline unsigned long
+copy_semid_from_user(struct semid64_ds *out, void __user *buf, int version)
 {
        switch(version) {
        case IPC_64:
-           {
-               struct semid64_ds tbuf;
-
-               if(copy_from_user(&tbuf, buf, sizeof(tbuf)))
+               if (copy_from_user(out, buf, sizeof(*out)))
                        return -EFAULT;
-
-               out->uid        = tbuf.sem_perm.uid;
-               out->gid        = tbuf.sem_perm.gid;
-               out->mode       = tbuf.sem_perm.mode;
-
                return 0;
-           }
        case IPC_OLD:
            {
                struct semid_ds tbuf_old;
@@ -864,9 +850,9 @@ static inline unsigned long copy_semid_from_user(struct sem_setbuf *out, void __
                if(copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
                        return -EFAULT;
 
-               out->uid        = tbuf_old.sem_perm.uid;
-               out->gid        = tbuf_old.sem_perm.gid;
-               out->mode       = tbuf_old.sem_perm.mode;
+               out->sem_perm.uid       = tbuf_old.sem_perm.uid;
+               out->sem_perm.gid       = tbuf_old.sem_perm.gid;
+               out->sem_perm.mode      = tbuf_old.sem_perm.mode;
 
                return 0;
            }
@@ -885,11 +871,11 @@ static int semctl_down(struct ipc_namespace *ns, int semid,
 {
        struct sem_array *sma;
        int err;
-       struct sem_setbuf uninitialized_var(setbuf);
+       struct semid64_ds semid64;
        struct kern_ipc_perm *ipcp;
 
        if(cmd == IPC_SET) {
-               if(copy_semid_from_user (&setbuf, arg.buf, version))
+               if (copy_semid_from_user(&semid64, arg.buf, version))
                        return -EFAULT;
        }
        down_write(&sem_ids(ns).rw_mutex);
@@ -906,7 +892,9 @@ static int semctl_down(struct ipc_namespace *ns, int semid,
                goto out_unlock;
 
        if (cmd == IPC_SET) {
-               err = audit_ipc_set_perm(0, setbuf.uid, setbuf.gid, setbuf.mode);
+               err = audit_ipc_set_perm(0, semid64.sem_perm.uid,
+                                        semid64.sem_perm.gid,
+                                        semid64.sem_perm.mode);
                if (err)
                        goto out_unlock;
        }
@@ -925,10 +913,10 @@ static int semctl_down(struct ipc_namespace *ns, int semid,
                freeary(ns, ipcp);
                goto out_up;
        case IPC_SET:
-               ipcp->uid = setbuf.uid;
-               ipcp->gid = setbuf.gid;
+               ipcp->uid = semid64.sem_perm.uid;
+               ipcp->gid = semid64.sem_perm.gid;
                ipcp->mode = (ipcp->mode & ~S_IRWXUGO)
-                               | (setbuf.mode & S_IRWXUGO);
+                               | (semid64.sem_perm.mode & S_IRWXUGO);
                sma->sem_ctime = get_seconds();
                break;
        default:
index 65a44bc..5e296b0 100644 (file)
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -511,28 +511,14 @@ static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_
        }
 }
 
-struct shm_setbuf {
-       uid_t   uid;
-       gid_t   gid;
-       mode_t  mode;
-};     
-
-static inline unsigned long copy_shmid_from_user(struct shm_setbuf *out, void __user *buf, int version)
+static inline unsigned long
+copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version)
 {
        switch(version) {
        case IPC_64:
-           {
-               struct shmid64_ds tbuf;
-
-               if (copy_from_user(&tbuf, buf, sizeof(tbuf)))
+               if (copy_from_user(out, buf, sizeof(*out)))
                        return -EFAULT;
-
-               out->uid        = tbuf.shm_perm.uid;
-               out->gid        = tbuf.shm_perm.gid;
-               out->mode       = tbuf.shm_perm.mode;
-
                return 0;
-           }
        case IPC_OLD:
            {
                struct shmid_ds tbuf_old;
@@ -540,9 +526,9 @@ static inline unsigned long copy_shmid_from_user(struct shm_setbuf *out, void __
                if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
                        return -EFAULT;
 
-               out->uid        = tbuf_old.shm_perm.uid;
-               out->gid        = tbuf_old.shm_perm.gid;
-               out->mode       = tbuf_old.shm_perm.mode;
+               out->shm_perm.uid       = tbuf_old.shm_perm.uid;
+               out->shm_perm.gid       = tbuf_old.shm_perm.gid;
+               out->shm_perm.mode      = tbuf_old.shm_perm.mode;
 
                return 0;
            }
@@ -625,12 +611,12 @@ static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
                       struct shmid_ds __user *buf, int version)
 {
        struct kern_ipc_perm *ipcp;
-       struct shm_setbuf setbuf;
+       struct shmid64_ds shmid64;
        struct shmid_kernel *shp;
        int err;
 
        if (cmd == IPC_SET) {
-               if (copy_shmid_from_user(&setbuf, buf, version))
+               if (copy_shmid_from_user(&shmid64, buf, version))
                        return -EFAULT;
        }
 
@@ -648,8 +634,9 @@ static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
                goto out_unlock;
 
        if (cmd == IPC_SET) {
-               err = audit_ipc_set_perm(0, setbuf.uid,
-                                        setbuf.gid, setbuf.mode);
+               err = audit_ipc_set_perm(0, shmid64.shm_perm.uid,
+                                        shmid64.shm_perm.gid,
+                                        shmid64.shm_perm.mode);
                if (err)
                        goto out_unlock;
        }
@@ -669,10 +656,10 @@ static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
                do_shm_rmid(ns, ipcp);
                goto out_up;
        case IPC_SET:
-               ipcp->uid = setbuf.uid;
-               ipcp->gid = setbuf.gid;
+               ipcp->uid = shmid64.shm_perm.uid;
+               ipcp->gid = shmid64.shm_perm.gid;
                ipcp->mode = (ipcp->mode & ~S_IRWXUGO)
-                       | (setbuf.mode & S_IRWXUGO);
+                       | (shmid64.shm_perm.mode & S_IRWXUGO);
                shp->shm_ctim = get_seconds();
                break;
        default: