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ipc: add msgget syscall wrapper

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Provide ksys_msgget() wrapper to avoid in-kernel calls to this syscall.
The ksys_ prefix denotes that this function is meant as a drop-in
replacement for the syscall. In particular, it uses the same calling
convention as sys_msgget().

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/[email protected]

Cc: Al Viro <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Dominik Brodowski <[email protected]>
This commit is contained in:
Dominik Brodowski 2018-03-20 20:06:04 +01:00
commit 3d65661a49
3 changed files with 9 additions and 3 deletions
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7
ipc/msg.c
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@ -263,7 +263,7 @@ static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
return security_msg_queue_associate(msq, msgflg);
}
SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
long ksys_msgget(key_t key, int msgflg)
{
struct ipc_namespace *ns;
static const struct ipc_ops msg_ops = {
@ -280,6 +280,11 @@ SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
}
SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
{
return ksys_msgget(key, msgflg);
}
static inline unsigned long
copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
{