linux-kernel - [PATCH 10/11] pidns: Consolidate initialzation of special init task state

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Date:	Fri, 16 Nov 2012 08:35:49 -0800
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	Linux Containers <containers@...ts.linux-foundation.org>
Cc:	<linux-kernel@...r.kernel.org>, Oleg Nesterov <oleg@...sign.ru>,
	Serge Hallyn <serge@...lyn.com>,
	Gao feng <gaofeng@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 10/11] pidns: Consolidate initialzation of special init task state

From: "Eric W. Biederman" <ebiederm@...ssion.com>

Instead of setting child_reaper and SIGNAL_UNKILLABLE one way
for the system init process, and another way for pid namespace
init processes test pid->nr == 1 and use the same code for both.

For the global init this results in SIGNAL_UNKILLABLE being set
much earlier in the initialization process.

This is a small cleanup and it paves the way for allowing unshare and
enter of the pid namespace as that path like our global init also will
not set CLONE_NEWPID.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 init/main.c   |    1 -
 kernel/fork.c |    6 +++---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/init/main.c b/init/main.c
index 9cf77ab..317750a 100644
--- a/init/main.c
+++ b/init/main.c
@@ -810,7 +810,6 @@ static int __ref kernel_init(void *unused)
 	system_state = SYSTEM_RUNNING;
 	numa_default_policy();
 
-	current->signal->flags |= SIGNAL_UNKILLABLE;
 	flush_delayed_fput();
 
 	if (ramdisk_execute_command) {
diff --git a/kernel/fork.c b/kernel/fork.c
index 666dc8b..0f2bbce 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1039,8 +1039,6 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 	atomic_set(&sig->live, 1);
 	atomic_set(&sig->sigcnt, 1);
 	init_waitqueue_head(&sig->wait_chldexit);
-	if (clone_flags & CLONE_NEWPID)
-		sig->flags |= SIGNAL_UNKILLABLE;
 	sig->curr_target = tsk;
 	init_sigpending(&sig->shared_pending);
 	INIT_LIST_HEAD(&sig->posix_timers);
@@ -1441,8 +1439,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 		ptrace_init_task(p, (clone_flags & CLONE_PTRACE) || trace);
 
 		if (thread_group_leader(p)) {
-			if (is_child_reaper(pid))
+			if (is_child_reaper(pid)) {
 				ns_of_pid(pid)->child_reaper = p;
+				p->signal->flags |= SIGNAL_UNKILLABLE;
+			}
 
 			p->signal->leader_pid = pid;
 			p->signal->tty = tty_kref_get(current->signal->tty);
-- 
1.7.5.4

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