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start the global /sbin/init with 0,0 special pids

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As Eric pointed out, there is no problem with init starting with sid == pgid
== 0, and this was historical linux behavior changed in 2.6.18.

Remove kernel_init()->__set_special_pids(), this is unneeded and complicates
the rules for sys_setsid().

This change and the previous change in daemonize() mean that /sbin/init does
not need the special "session != 1" hack in sys_setsid() any longer. We can't
remove this check yet, we should cleanup copy_process(CLONE_NEWPID) first, so
update the comment only.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2008-02-08 04:19:11 -08:00 • committed by Linus Torvalds
parent 297bd42b15
commit 430c623121
2 changed files with 4 additions and 6 deletions
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1
init/main.c
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@ -833,7 +833,6 @@ static int __init kernel_init(void * unused)
*/
init_pid_ns.child_reaper = current;
__set_special_pids(task_pid(current));
cad_pid = task_pid(current);
smp_prepare_cpus(setup_max_cpus);