Namespaces exhausted CLONE_XXX bits problem

Pavel Emelyanov xemul at
Mon Jan 14 08:52:21 PST 2008

Serge E. Hallyn wrote:
> Quoting Cedric Le Goater (clg at
>> to be more precise :
>> 	long sys_clone_something(struct clone_something_args args) 
>> and 
>> 	long sys_unshare_something(struct unshare_something_args args) 
>> The arg passing will be slower bc of the copy_from_user() but we will 
>> still have the sys_clone syscall for the fast path.
>> C.
> I'm fine with the direction you're going, but just as one more option,
> we could follow more of the selinux/lsm approach of first requesting
> clone/unshare options, then doing the actual clone/unshare.  So
> something like
> 	sys_clone_request(extended_64bit_clone_flags)

What if we someday hit the 64-bit limit? :)

> 	sys_clone(usual args)
> or
> 	echo pid,mqueue,user,ipc,uts,net > /proc/self/clone_unshare
> 	clone()

Well, this is how sys_indirect() was intended to work. Nobody
liked it, so I'm afraid this will also not be accepted.

> -serge


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