linux-kernel - Re: [PATCH] ns: introduce getnspid syscall

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Message-ID: <20140618175807.GA21565@redhat.com>
Date:	Wed, 18 Jun 2014 19:58:07 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Chen Hanxiao <chenhanxiao@...fujitsu.com>
Cc:	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	Richard Weinberger <richard.weinberger@...il.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Vasiliy Kulikov <segooon@...il.com>,
	Gotou Yasunori <y-goto@...fujitsu.com>
Subject: Re: [PATCH] ns: introduce getnspid syscall

On 06/17, Chen Hanxiao wrote:
>
> +SYSCALL_DEFINE4(getnspid, pid_t, pid, int, fd1, int, fd2, int, pidtype)
> +{
> +	struct file *file1 = NULL, *file2 = NULL;
> +	struct task_struct *task;
> +	struct pid_namespace *ns1, *ns2;
> +	struct proc_ns *ei;
> +	int ret = -1;
> +
> +	if (pidtype >= PIDTYPE_MAX)
> +		return -EINVAL;
> +
> +	file1 = proc_ns_fget(fd1);
> +	if (IS_ERR(file1))
> +		return PTR_ERR(file1);
> +	ei = get_proc_ns(file_inode(file1));
> +	ns1 = (struct pid_namespace *)ei->ns;

and I am not sure this part is correct... shouldn't we also verify that
ns_ops == pidns_operations ?

Perhaps it makes sense to generalize get_net_ns_by_fd() into
"void *get_ns_by_fd(fd, type)"... this probably needs another "check-and-get"
method in proc_ns_operations(). I dunno.

Oleg.

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