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[PATCH v6 07/10] ipc: add new SEM_SET command for sys_semctl() call
https://new-forum.openvz.org/index.phpindex.php?t=rview&goto=48355&th=11203#msg_48355
update key, cuid and cgid values. IOW, it allows to change existent key value.
The fact, that key is not used is checked before update. Otherwise -EEXIST is
returned.
/* Obsolete, used only for backwards compatibility and libc5 compiles */
struct semid_ds {
diff --git a/ipc/compat.c b/ipc/compat.c
index 9c70f9a..84d8efd 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -290,6 +290,7 @@ static long do_compat_semctl(int first, int second, int third, u32 pad)
break;
case IPC_SET:
+ case SEM_SET:
if (version == IPC_64) {
err = get_compat_semid64_ds(&s64, compat_ptr(pad));
} else {
diff --git a/ipc/sem.c b/ipc/sem.c
index 10e9085..3eac885 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1085,12 +1085,13 @@ static int semctl_down(struct ipc_namespace *ns, int semid,
struct semid64_ds semid64;
struct kern_ipc_perm *ipcp;
- ipcp = ipcctl_pre_down(ns, &sem_ids(ns), semid, cmd,
+ ipcp = ipcctl_pre_down(ns, &sem_ids(ns), semid,
+ (cmd != SEM_SET) ? cmd : IPC_SET,
&semid64.sem_perm, 0);
if (IS_ERR(ipcp))
return PTR_ERR(ipcp);
@@ -1105,6 +1106,10 @@ static int semctl_down(struct ipc_namespace *ns, int semid,
case IPC_RMID:
freeary(ns, ipcp);
goto out_up;
+ case SEM_SET:
+ err = ipc_update_key(&sem_ids(ns), &semid64.sem_perm, ipcp);
+ if (err)
+ break;
case IPC_SET:
err = ipc_update_perm(&semid64.sem_perm, ipcp);
if (err)
@@ -1152,6 +1157,7 @@ SYSCALL_DEFINE(semctl)(int semid, int semnum, int cmd, union semun arg)
return err;
case IPC_RMID:
case IPC_SET:
+ case SEM_SET:
err = semctl_down(ns, semid, cmd, version, arg);
return err;
default:
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 78b77ac..02b037d 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -5133,6 +5133,7 @@ static int selinux_sem_semctl(struct sem_array *sma, int cmd)
perms = SEM__DESTROY;
break;
case IPC_SET:
+ case SEM_SET:
perms = SEM__SETATTR;
break;
case IPC_STAT:
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index d51a8da..b4135ed 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2253,6 +2253,7 @@ static int smack_sem_semctl(struct sem_array *sma, int cmd)
case SETALL:
case IPC_RMID:
case IPC_SET:
+ case SEM_SET:
may = MAY_READWRITE;
break;
case IPC_INFO:]]>Stanislav Kinsbursky2012-10-15T16:00:12-00:00Re: [PATCH v6 07/10] ipc: add new SEM_SET command for sys_semctl() call
https://new-forum.openvz.org/index.phpindex.php?t=rview&goto=48571&th=11203#msg_48571
skinsbursky@parallels.com):
> New SEM_SET command will be interpreted exactly as IPC_SET, but also will
> update key, cuid and cgid values. IOW, it allows to change existent key value.
> The fact, that key is not used is checked before update. Otherwise -EEXIST is
> returned.
>
> Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>