linux-kernel - Re: + procfs-mark-thread-stack-correctly-in-proc-pid-maps.patch added to -mm tree

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Message-ID: <20120228170436.GA9698@redhat.com>
Date:	Tue, 28 Feb 2012 18:04:36 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Siddhesh Poyarekar <siddhesh.poyarekar@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jamie Lokier <jamie@...reable.org>,
	Mike Frysinger <vapier@...too.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: + procfs-mark-thread-stack-correctly-in-proc-pid-maps.patch
	added to -mm tree

> +int vm_is_stack(struct task_struct *task,
> +			      struct vm_area_struct *vma, int in_group)
> +{
> +	if (vm_is_stack_for_task(task, vma))
> +		return 1;
> +
> +	if (in_group) {
> +		struct task_struct *t = task;
> +		while_each_thread(task, t) {
> +			if (vm_is_stack_for_task(t, vma))
> +				return 1;
> +		}
> +	}
> +
> +	return 0;
> +}

This is obviously wrong, while_each_thread() is not safe without
tasklist or siglock or rcu.

Oleg.

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