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authorPierre Peiffer <pierre.peiffer@bull.net>2008-04-29 01:00:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:14 -0700
commita5f75e7f256f75759ec3d6dbef0ba932f1b397d2 (patch)
tree89b2ed22547a9fca11f87eb6cba68bb84fcf1b8a /ipc/msg.c
parent8f4a3809c18ff3107bdbb1fabe3f4e5d2a928321 (diff)
downloadlinux-a5f75e7f256f75759ec3d6dbef0ba932f1b397d2.tar.gz
IPC: consolidate all xxxctl_down() functions
semctl_down(), msgctl_down() and shmctl_down() are used to handle the same set of commands for each kind of IPC. They all start to do the same job (they retrieve the ipc and do some permission checks) before handling the commands on their own. This patch proposes to consolidate this by moving these same pieces of code into one common function called ipcctl_pre_down(). It simplifies a little these xxxctl_down() functions and increases a little the maintainability. 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>
Diffstat (limited to 'ipc/msg.c')
-rw-r--r--ipc/msg.c48
1 files changed, 5 insertions, 43 deletions
diff --git a/ipc/msg.c b/ipc/msg.c
index 87d8b385230..4a858f98a76 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -142,21 +142,6 @@ void __init msg_init(void)
}
/*
- * This routine is called in the paths where the rw_mutex is held to protect
- * access to the idr tree.
- */
-static inline struct msg_queue *msg_lock_check_down(struct ipc_namespace *ns,
- int id)
-{
- struct kern_ipc_perm *ipcp = ipc_lock_check_down(&msg_ids(ns), id);
-
- if (IS_ERR(ipcp))
- return (struct msg_queue *)ipcp;
-
- return container_of(ipcp, struct msg_queue, q_perm);
-}
-
-/*
* msg_lock_(check_) routines are called in the paths where the rw_mutex
* is not held.
*/
@@ -437,35 +422,12 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
return -EFAULT;
}
- down_write(&msg_ids(ns).rw_mutex);
- msq = msg_lock_check_down(ns, msqid);
- if (IS_ERR(msq)) {
- err = PTR_ERR(msq);
- goto out_up;
- }
-
- ipcp = &msq->q_perm;
-
- err = audit_ipc_obj(ipcp);
- if (err)
- goto out_unlock;
-
- if (cmd == IPC_SET) {
- 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;
- }
+ ipcp = ipcctl_pre_down(&msg_ids(ns), msqid, cmd,
+ &msqid64.msg_perm, msqid64.msg_qbytes);
+ if (IS_ERR(ipcp))
+ return PTR_ERR(ipcp);
- if (current->euid != ipcp->cuid &&
- current->euid != ipcp->uid &&
- !capable(CAP_SYS_ADMIN)) {
- /* We _could_ check for CAP_CHOWN above, but we don't */
- err = -EPERM;
- goto out_unlock;
- }
+ msq = container_of(ipcp, struct msg_queue, q_perm);
err = security_msg_queue_msgctl(msq, cmd);
if (err)