linux-kernel - Re: [PATCH] unserialized task->files changing

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Date:	Tue, 8 Aug 2006 11:12:08 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Kirill Korotaev <dev@...ru>
Cc:	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] unserialized task->files changing

On Tue, Aug 08, 2006 at 02:07:49PM +0400, Kirill Korotaev wrote:
> Fixed race on put_files_struct on exec with proc.
> Restoring files on current on error path may lead
> to proc having a pointer to already kfree-d files_struct.

This is three times the exact same code sequence, it should probably go into
a helper:

void reset_current_files(struct files_struct *files)
{
	struct files_struct *old = current->files;

	task_lock(current);
	current->files = files;
	task_unlock(current);
	put_files_struct(old);
}

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