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Date:	Mon, 29 Oct 2007 10:51:24 +0300
From:	Kirill Korotaev <dev@...nvz.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Containers <containers@...ts.osdl.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [PATCH] pidns: Place under CONFIG_EXPERIMENTAL (take 2)

Can you please send namespace related patches to containers@ ML first
before sending them to Linus/Andrew?

Thanks,
Kirill


Eric W. Biederman wrote:
> This is my trivial patch to swat innumerable little bugs
> with a single blow.
> 
> After some intensive review (my apologies for not having
> gotten to this sooner) what we have looks like a good
> base to build on with the current pid namespace code but
> it is not complete, and it is still much to simple to find
> issues where the kernel does the wrong thing outside of
> the initial pid namespace.
> 
> Until the dust settles and we are certain we have the ABI and
> the implementation is as correct as humanly possible let's keep
> process ID namespaces behind CONFIG_EXPERIMENTAL. 
> 
> Allowing us the option of fixing any ABI or other bugs
> we find as long as they are minor.
> 
> Allowing users of the kernel to avoid those bugs simply
> by ensuring their kernel does not have support for multiple
> pid namespaces.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
> ---
>  include/linux/pid_namespace.h |   22 ++++++++++++++++++++++
>  init/Kconfig                  |   12 ++++++++++++
>  kernel/pid.c                  |    2 ++
>  3 files changed, 36 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
> index 0135c76..0227e68 100644
> --- a/include/linux/pid_namespace.h
> +++ b/include/linux/pid_namespace.h
> @@ -29,6 +29,7 @@ struct pid_namespace {
>  
>  extern struct pid_namespace init_pid_ns;
>  
> +#ifdef CONFIG_PID_NS
>  static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
>  {
>  	if (ns != &init_pid_ns)
> @@ -45,6 +46,27 @@ static inline void put_pid_ns(struct pid_namespace *ns)
>  		kref_put(&ns->kref, free_pid_ns);
>  }
>  
> +#else /* !CONFIG_PID_NS */
> +#include <linux/err.h>
> +
> +static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
> +{
> +	return ns;
> +}
> +
> +static inline struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
> +{
> +	if (flags & CLONE_NEWPID)
> +		ns = ERR_PTR(-EINVAL);
> +	return ns;
> +}
> +
> +static inline void put_pid_ns(struct pid_namespace *ns)
> +{
> +}
> +
> +#endif /* CONFIG_PID_NS */
> +
>  static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)
>  {
>  	return tsk->nsproxy->pid_ns;
> diff --git a/init/Kconfig b/init/Kconfig
> index 8b88d0b..72e37c0 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -215,6 +215,18 @@ config USER_NS
>  	  vservers, to use user namespaces to provide different
>  	  user info for different servers.  If unsure, say N.
>  
> +config PID_NS
> +	bool "PID Namespaces (EXPERIMENTAL)"
> +	default n
> +	depends on EXPERIMENTAL
> +	help
> +	  Suport process id namespaces.  This allows having multiple
> +	  process with the same pid as long as they are in different
> +	  pid namespaces.  This is a building block of containers.
> +
> +	  Unless you want to work with an experimental feature
> +	  say N here.
> +
>  config AUDIT
>  	bool "Auditing support"
>  	depends on NET
> diff --git a/kernel/pid.c b/kernel/pid.c
> index d1db36b..f815455 100644
> --- a/kernel/pid.c
> +++ b/kernel/pid.c
> @@ -537,6 +537,7 @@ err_alloc:
>  	return NULL;
>  }
>  
> +#ifdef CONFIG_PID_NS
>  static struct pid_namespace *create_pid_namespace(int level)
>  {
>  	struct pid_namespace *ns;
> @@ -621,6 +622,7 @@ void free_pid_ns(struct kref *kref)
>  	if (parent != NULL)
>  		put_pid_ns(parent);
>  }
> +#endif /* CONFIG_PID_NS */
>  
>  void zap_pid_ns_processes(struct pid_namespace *pid_ns)
>  {

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