unshare() pid ns [message #19827] |
Thu, 30 August 2007 05:29 |
Sukadev Bhattiprolu
Messages: 413 Registered: August 2006
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Senior Member |
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Pavel,
unshare() of pid ns seems to fail with -EINVAL in 2.6.23-rc3-mm1.
I thought we supported it in the earlier patchsets. I guess
I missed that in the review of recent patchsets.
Did we remove/disable it on purpose ? I am not particular that we
support it though. Just want to make sure.
Suka
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Re: unshare() pid ns [message #19854 is a reply to message #19853] |
Thu, 30 August 2007 16:34 |
Cedric Le Goater
Messages: 443 Registered: February 2006
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Senior Member |
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Hello Pavel !
Pavel Emelyanov wrote:
> Serge E. Hallyn wrote:
>> Quoting Pavel Emelyanov (xemul@openvz.org):
>>> sukadev@us.ibm.com wrote:
>>>> Pavel,
>>>> unshare() of pid ns seems to fail with -EINVAL in 2.6.23-rc3-mm1.
>>>> I thought we supported it in the earlier patchsets. I guess
>>>> I missed that in the review of recent patchsets.
>>> I disabled unsharing of pid namespaces because it's almost
>>> impossible. Look - you have to reattach all the pids to the
>>> task with saving its ids as seen in previous namespaces.
>> We agree, but thought you for some perverse reason preferred unshare to
>> clone for pidns :)
>
> I did that in my first version of patches, but then realized
> that such problem (the need in reattaching pids) makes the
> unsharing ugly.
>
> BTW, unsharing of a pid namespace is a valid operation, so I
> think I will enable it in the nearest future. I have some
> thought on how to make such a reattach ;)
that would be also very useful to 'enter' such a namespace.
BTW, did you take a look at the sys_hijack() serge sent ?
Thanks,
C.
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