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authorPierre Peiffer <pierre.peiffer@bull.net>2008-04-29 01:00:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:13 -0700
commit016d7132f246a05e6e34ccba157fa278a96c45ae (patch)
treea7003a30b2c2e4a399f6394a860b10fbd1afa4da /ipc/sem.c
parent21a4826a7c49bddebbe8d83d232f6416f1697ff0 (diff)
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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>
Diffstat (limited to 'ipc/sem.c')
-rw-r--r--ipc/sem.c40
1 files changed, 14 insertions, 26 deletions
diff --git a/ipc/sem.c b/ipc/sem.c
index db161decb76..df98de29047 100644
--- 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: