linux-kernel - Re: [PATCH 2/2] check_unsafe_exec: s/lock_task_sighand/rcu_read

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Message-ID: <Pine.LNX.4.64.0904240526080.15735@blonde.anvils>
Date:	Fri, 24 Apr 2009 05:29:51 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Oleg Nesterov <oleg@...hat.com>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joe Malicki <jmalicki@...acarta.com>,
	Michael Itz <mitz@...acarta.com>,
	Kenneth Baker <bakerk@...acarta.com>,
	Chris Wright <chrisw@...s-sol.org>,
	David Howells <dhowells@...hat.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Roland McGrath <roland@...hat.com>
Subject: Re: [PATCH 2/2] check_unsafe_exec: s/lock_task_sighand/rcu_read_lock/

On Fri, 23 Apr 2009, Oleg Nesterov wrote:
>  	write_lock(&p->fs->lock);
> -	lock_task_sighand(p, &flags);
> +	rcu_read_lock();
>  	for (t = next_thread(p); t != p; t = next_thread(t)) {
>  		if (t->fs == p->fs)
>  			n_fs++;
>  	}
> +	rcu_read_lock();

Not quite! if second rcu_read_lock() changed to rcu_read_unlock(), then
Acked-by: Hugh Dickins <hugh@...itas.com>
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