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IPC: introduce ipc_update_perm() 

The IPC_SET command performs the same permission setting for all IPCs.  This
patch introduces a common ipc_update_perm() function to update these
permissions and makes use of it for all IPCs.

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 01:00:51 -07:00 committed by Linus Torvalds
parent 016d7132f2
commit 8f4a3809c1
5 changed files with 17 additions and 12 deletions
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5
ipc/msg.c
View File

@ -484,10 +484,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
msq->q_qbytes = msqid64.msg_qbytes;
ipcp->uid = msqid64.msg_perm.uid;
ipcp->gid = msqid64.msg_perm.gid;
ipcp->mode = (ipcp->mode & ~S_IRWXUGO) |
(S_IRWXUGO & msqid64.msg_perm.mode);
ipc_update_perm(&msqid64.msg_perm, ipcp);
msq->q_ctime = get_seconds();
/* sleeping receivers might be excluded by
* stricter permissions.

5
ipc/sem.c
View File

@ -913,10 +913,7 @@ static int semctl_down(struct ipc_namespace *ns, int semid,
freeary(ns, ipcp);
goto out_up;
case IPC_SET:
ipcp->uid = semid64.sem_perm.uid;
ipcp->gid = semid64.sem_perm.gid;
ipcp->mode = (ipcp->mode & ~S_IRWXUGO)
| (semid64.sem_perm.mode & S_IRWXUGO);
ipc_update_perm(&semid64.sem_perm, ipcp);
sma->sem_ctime = get_seconds();
break;
default:

5
ipc/shm.c
View File

@ -656,10 +656,7 @@ 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 = shmid64.shm_perm.uid;
ipcp->gid = shmid64.shm_perm.gid;
ipcp->mode = (ipcp->mode & ~S_IRWXUGO)
| (shmid64.shm_perm.mode & S_IRWXUGO);
ipc_update_perm(&shmid64.shm_perm, ipcp);
shp->shm_ctim = get_seconds();
break;
default:

13
ipc/util.c
View File

@ -811,6 +811,19 @@ int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
return ipcget_public(ns, ids, ops, params);
}
/**
* ipc_update_perm - update the permissions of an IPC.
* @in: the permission given as input.
* @out: the permission of the ipc to set.
*/
void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out)
{
out->uid = in->uid;
out->gid = in->gid;
out->mode = (out->mode & ~S_IRWXUGO)
| (in->mode & S_IRWXUGO);
}
#ifdef __ARCH_WANT_IPC_PARSE_VERSION

1
ipc/util.h
View File

@ -112,6 +112,7 @@ struct kern_ipc_perm *ipc_lock(struct ipc_ids *, int);
void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out);
#if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__)
/* On IA-64, we always use the "64-bit version" of the IPC structures. */