linux-kernel - Re: [PATCH v2 4/4] proc: avoid ->f_pos overflows in proc_task

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Message-ID: <20130604173917.GB13110@ZenIV.linux.org.uk>
Date:	Tue, 4 Jun 2013 18:39:17 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Sergey Dyasly <dserrg@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] proc: avoid ->f_pos overflows in
 proc_task_readdir() paths

On Tue, Jun 04, 2013 at 07:14:35PM +0200, Oleg Nesterov wrote:
> > There is another bug in here as well that we may return really crazy
> > things in the case of seek simultaneous with readdir.
> 
> i_mutex? both vfs_readdir() and default_llseek() take it... Anyway, this
> is another issue.

That's part of the reasons for the series I've mentioned (vfs.git#experimental);
seriously, check that up.
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