Re: [PATCH 0/16] Pid namespaces

sukadev
2007-07-10T00:29:45Z

Pavel Emelianov [xemul@openvz.org] wrote:
| This is "submition for inclusion" of hierarchical, not kconfig
| configurable, zero overheaded ;) pid namespaces.
|
| The overall idea is the following:
|
| The namespace are organized as a tree - once a task is cloned
| with CLONE_NEWPIDS (yes, I've also switched to it :) the new

Can you really clone() a pid namespace all by itself ?
copy_namespaces() has the following:

if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWUSER)))
return 0;

doesn't it mean you cannot create a pid namespace using clone() unless
one of the above flags are also specified ?

unshare_nsproxy_namespaces() has the following correct check:

if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
CLONE_NEWUSER | CLONE_NEWPIDS)))
return 0;

BTW, why not use CLONE_NEWPID and drop the 'S' ? We don't have 'S' with
other namespaces.

Suka