IPC: get rid of the use *_setbuf structure.
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>
diff --git a/ipc/msg.c b/ipc/msg.c
index 9d868b3..80375bf 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -388,31 +388,14 @@
}
}
-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 @@
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 @@
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 @@
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 @@
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.
