[PATCH 0/6] Unshare support for the pid namespace.

[Eric W. Biederman]

Oleg Nesterov <oleg@xxxxxxxxxx> writes:

> On 06/18, Oleg Nesterov wrote:
>>
>> I only try to discuss the idea to break the circular reference.
>
> I don't know what I have missed, but this looks really right to me.
> Besides, we have yet another problem: proc_flush_task()->mntput()
> is just wrong. Consider the multithreaded execing init.
>
> I am going to simplify, test, and send the fix which moves mntput()
> into free_pid_ns() paths.

free_pid_ns is comparatively late, to release the kern_mount.

> But first of all I think we should cleanup the pid_ns_prepare_proc()
> logic. Imho, this code is really ugly. Please see the patches.

Since I have a patchset that makes it possible to unshare the pid
namespace about ready to send I figure we should combine the two
efforts.

This patchset is a prerequisite to my patches for giving namespaces
file descriptors and allowing you to join and existing namespace.
When I look over my old notes it appears there Daniel managed to hit
this proc_mnt reference counting in that context.  So that is definitely
interesting.

Oleg take a look I think I have combined the best of our two patchsets.

Eric
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