diff --git a/ipc/shm.c b/ipc/shm.c
index 5e296b0..20e03df 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -656,10 +656,7 @@
 		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: