linux-kernel - Re: [RFC PATCH 1/8] nsproxy

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Date:	Tue, 03 Feb 2015 15:20:35 +0800
From:	Ian Kent <raven@...maw.net>
To:	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/8] nsproxy - refactor setns()

Oops!
Please ignore these, mistakenly sent.

On Tue, 2015-02-03 at 15:16 +0800, Ian Kent wrote:
> For usermode helpers to execute within a namspace a slightly different
> entry point to setns() that takes a namspace inode is needed.
> 
> Signed-off-by: Ian Kent <ikent@...hat.com>
> Cc: Benjamin Coddington <bcodding@...hat.com>
> Cc: Al Viro <viro@...IV.linux.org.uk>
> Cc: J. Bruce Fields <bfields@...ldses.org>
> Cc: David Howells <dhowells@...hat.com>
> Cc: Trond Myklebust <trond.myklebust@...marydata.com>
> Cc: Oleg Nesterov <onestero@...hat.com>
> Cc: Eric W. Biederman <ebiederm@...ssion.com>
> Cc: Jeff Layton <jeff.layton@...marydata.com>
> ---
>  include/linux/nsproxy.h |    1 +
>  kernel/nsproxy.c        |   21 ++++++++++++++-------
>  2 files changed, 15 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h
> index 35fa08f..c75bf12 100644
> --- a/include/linux/nsproxy.h
> +++ b/include/linux/nsproxy.h
> @@ -62,6 +62,7 @@ extern struct nsproxy init_nsproxy;
>   *
>   */
>  
> +int setns_inode(struct inode *inode, int nstype);
>  int copy_namespaces(unsigned long flags, struct task_struct *tsk);
>  void exit_task_namespaces(struct task_struct *tsk);
>  void switch_task_namespaces(struct task_struct *tsk, struct nsproxy *new);
> diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
> index 49746c8..27cc544 100644
> --- a/kernel/nsproxy.c
> +++ b/kernel/nsproxy.c
> @@ -218,20 +218,15 @@ void exit_task_namespaces(struct task_struct *p)
>  	switch_task_namespaces(p, NULL);
>  }
>  
> -SYSCALL_DEFINE2(setns, int, fd, int, nstype)
> +int setns_inode(struct inode *inode, int nstype)
>  {
>  	struct task_struct *tsk = current;
>  	struct nsproxy *new_nsproxy;
> -	struct file *file;
>  	struct ns_common *ns;
>  	int err;
>  
> -	file = proc_ns_fget(fd);
> -	if (IS_ERR(file))
> -		return PTR_ERR(file);
> -
>  	err = -EINVAL;
> -	ns = get_proc_ns(file_inode(file));
> +	ns = get_proc_ns(inode);
>  	if (nstype && (ns->ops->type != nstype))
>  		goto out;
>  
> @@ -248,6 +243,18 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype)
>  	}
>  	switch_task_namespaces(tsk, new_nsproxy);
>  out:
> +	return err;
> +}
> +
> +SYSCALL_DEFINE2(setns, int, fd, int, nstype)
> +{
> +	struct file *file;
> +	int err;
> +
> +	file = proc_ns_fget(fd);
> +	if (IS_ERR(file))
> +		return PTR_ERR(file);
> +	err = setns_inode(file_inode(file), nstype);
>  	fput(file);
>  	return err;
>  }
> 
> --
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