Oleg Nesterov <oleg@tv-sign.ru> writes:

quoted text
> sys_setsid() still deals with pid_t's from the global namespace. This means
> that the "session > 1" check can't help for sub-namespace init, setsid() can't
> succeed because copy_process(CLONE_NEWPID) populates PIDTYPE_PGID/SID links.

We can do even better.  We can remove the misguided code from
copy_process(CLONE_NEWPID) that populates the PIDTYPE_PGID/SID links
and generally does set setsid by hand, and the code from kernel_init
that call set_special_pid(), allowing us to remove the special case
entirely.

The set_special_pid() in kernel_init() and the special case check 
is actually a work around for the fact that earlier we could not
use 0 in the pid hash table.  Now that we can use init_struct_pid
directly we don't need the special case at all.

Eric
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