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IPC: get rid of the use *_setbuf structure.

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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>
This commit is contained in:
Pierre Peiffer
2008-04-29 01:00:50 -07:00
committed by Linus Torvalds
parent 21a4826a7c
commit 016d7132f2
3 changed files with 46 additions and 86 deletions
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51
ipc/msg.c
View File

@@ -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.