linux-kernel - Re: [PATCH] connector: Fix sid connector (was: Badness at kernel/softirq.c:143...)

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Message-ID: <20090929162855.GA15319@redhat.com>
Date:	Tue, 29 Sep 2009 18:28:56 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	Scott James Remnant <scott@...ntu.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Matt Helsley <matthltc@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] connector: Fix sid connector (was: Badness at
	kernel/softirq.c:143...)

On 09/29, Christian Borntraeger wrote:
>
>
> The network code must not be called with disabled interrupts but
> sys_setsid holds the tasklist_lock with spinlock_irq while calling
> the connector. We can safely move proc_sid_connector from
> __set_special_pids to sys_setsid.
>
> Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
>
> ---
>  kernel/exit.c |    4 +---
>  kernel/sys.c  |    2 ++
>  2 files changed, 3 insertions(+), 3 deletions(-)
>
> Index: linux-2.6/kernel/exit.c
> ===================================================================
> --- linux-2.6.orig/kernel/exit.c
> +++ linux-2.6/kernel/exit.c
> @@ -359,10 +359,8 @@ void __set_special_pids(struct pid *pid)
>  {
>  	struct task_struct *curr = current->group_leader;
>
> -	if (task_session(curr) != pid) {
> +	if (task_session(curr) != pid)
>  		change_pid(curr, PIDTYPE_SID, pid);
> -		proc_sid_connector(curr);
> -	}
>
>  	if (task_pgrp(curr) != pid)
>  		change_pid(curr, PIDTYPE_PGID, pid);
> Index: linux-2.6/kernel/sys.c
> ===================================================================
> --- linux-2.6.orig/kernel/sys.c
> +++ linux-2.6/kernel/sys.c
> @@ -1110,6 +1110,8 @@ SYSCALL_DEFINE0(setsid)
>  	err = session;
>  out:
>  	write_unlock_irq(&tasklist_lock);
> +	if (err > 0)
> +		proc_sid_connector(sid);
>  	return err;
>  }

Acked-by: Oleg Nesterov <oleg@...hat.com>

I'd suggest you to resend this patch to Andrew. Unless you know
another way to push it into Linus's tree ;)

Perhaps it makes sense to update the changelog, it should mention
the issues with daemonize().

Oleg.

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