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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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41
ipc/shm.c
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@@ -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: