sem/security: Pass kern_ipc_perm not sem_array into the sem security hooks
All of the implementations of security hooks that take sem_array only
access sem_perm the struct kern_ipc_perm member. This means the
dependencies of the sem security hooks can be simplified by passing
the kern_ipc_perm member of sem_array.
Making this change will allow struct sem and struct sem_array
to become private to ipc/sem.c.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
diff --git a/ipc/sem.c b/ipc/sem.c
index a4af049..01f5c63 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -265,7 +265,7 @@ static void sem_rcu_free(struct rcu_head *head)
struct kern_ipc_perm *p = container_of(head, struct kern_ipc_perm, rcu);
struct sem_array *sma = container_of(p, struct sem_array, sem_perm);
- security_sem_free(sma);
+ security_sem_free(&sma->sem_perm);
kvfree(sma);
}
@@ -495,7 +495,7 @@ static int newary(struct ipc_namespace *ns, struct ipc_params *params)
sma->sem_perm.key = key;
sma->sem_perm.security = NULL;
- retval = security_sem_alloc(sma);
+ retval = security_sem_alloc(&sma->sem_perm);
if (retval) {
kvfree(sma);
return retval;
@@ -535,10 +535,7 @@ static int newary(struct ipc_namespace *ns, struct ipc_params *params)
*/
static inline int sem_security(struct kern_ipc_perm *ipcp, int semflg)
{
- struct sem_array *sma;
-
- sma = container_of(ipcp, struct sem_array, sem_perm);
- return security_sem_associate(sma, semflg);
+ return security_sem_associate(ipcp, semflg);
}
/*
@@ -1209,7 +1206,7 @@ static int semctl_stat(struct ipc_namespace *ns, int semid,
if (ipcperms(ns, &sma->sem_perm, S_IRUGO))
goto out_unlock;
- err = security_sem_semctl(sma, cmd);
+ err = security_sem_semctl(&sma->sem_perm, cmd);
if (err)
goto out_unlock;
@@ -1300,7 +1297,7 @@ static int semctl_setval(struct ipc_namespace *ns, int semid, int semnum,
return -EACCES;
}
- err = security_sem_semctl(sma, SETVAL);
+ err = security_sem_semctl(&sma->sem_perm, SETVAL);
if (err) {
rcu_read_unlock();
return -EACCES;
@@ -1354,7 +1351,7 @@ static int semctl_main(struct ipc_namespace *ns, int semid, int semnum,
if (ipcperms(ns, &sma->sem_perm, cmd == SETALL ? S_IWUGO : S_IRUGO))
goto out_rcu_wakeup;
- err = security_sem_semctl(sma, cmd);
+ err = security_sem_semctl(&sma->sem_perm, cmd);
if (err)
goto out_rcu_wakeup;
@@ -1545,7 +1542,7 @@ static int semctl_down(struct ipc_namespace *ns, int semid,
sma = container_of(ipcp, struct sem_array, sem_perm);
- err = security_sem_semctl(sma, cmd);
+ err = security_sem_semctl(&sma->sem_perm, cmd);
if (err)
goto out_unlock1;
@@ -1962,7 +1959,7 @@ static long do_semtimedop(int semid, struct sembuf __user *tsops,
goto out_free;
}
- error = security_sem_semop(sma, sops, nsops, alter);
+ error = security_sem_semop(&sma->sem_perm, sops, nsops, alter);
if (error) {
rcu_read_unlock();
goto out_free;