linux-kernel - Re: [PATCH] SELinux: Remove excessive interrupt disablement

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Message-ID: <20090429130522.GA29151@redhat.com>
Date:	Wed, 29 Apr 2009 15:05:22 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	David Howells <dhowells@...hat.com>
Cc:	linux-security-module@...r.kernel.org, jmorris@...ei.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] SELinux: Remove excessive interrupt disablement

On 04/29, David Howells wrote:
>
> @@ -2410,9 +2409,9 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
>  	 * wait permission to the new task SID. */
>  	read_lock_irq(&tasklist_lock);

_irq is not needed, just read_lock(&tasklist_lock) should be fine.

>  	psig = current->parent->sighand;
> -	spin_lock_irqsave(&psig->siglock, flags);
> +	spin_lock(&psig->siglock);

I think we don't need ->siglock at all.

>  	wake_up_interruptible(&current->parent->signal->wait_chldexit);

off-topic wrt this patch, but I believe we need

	__wake_up_parent(curremt, current->real_parent);

Oleg.

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