linux-kernel - Re: c/r: broken locking when executing map

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Message-ID: <4FA17015.1000504@parallels.com>
Date:	Wed, 02 May 2012 21:34:13 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Sasha Levin <levinsasha928@...il.com>
CC:	"khlebnikov@...nvz.org" <khlebnikov@...nvz.org>,
	"gorcunov@...nvz.org" <gorcunov@...nvz.org>,
	Dave Jones <davej@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: c/r: broken locking when executing map_files

On 05/02/2012 09:23 PM, Sasha Levin wrote:
> Hi all,
> 
> I've stumbled on several lockdep warnings when playing with the new files created under /proc/[pid], specifically 'map_files'.
> 
> My theory is that files under map_files shouldn't be executable, 

These are symlinks and x bit on them doesn't mean anything, but anyway, thanks for catching this.

> but since I'm not sure what the usermode code for
> c/r does exactly, I should probably confirm that first. If it's indeed the case, you can probably skip
> the rest of this mail.
> 
> First, if I try to simply execute one of the mappings:
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