linux-kernel - Re: [PATCH 1/9] exec_path 1/9: introduce ->exec

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Date:	Fri, 5 Jun 2009 09:48:02 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
cc:	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Helsley <matthltc@...ibm.com>, xemul@...allels.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, dave@...ux.vnet.ibm.com,
	mingo@...e.hu, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/9] exec_path 1/9: introduce ->exec_path and switch
 /proc/*/exe

On Fri, 5 Jun 2009, Alexey Dobriyan wrote:
> 
> It's borrowed by kernel thread of course, not userspace task.

.. and even if it is, what's the problem? 

That kernel thread has borroed whe VM for a while. It effectively _is_ a 
thread of the process now. So it's technically not even wrong to 
explicitly allow things like /proc/*/exe to see it as such.

But you can hide it by just checking some flag in the thread structure if 
you really want to.

But when creating a regular thread, you should _not_ need to take a 
spinlock and duplicate the executable path!

		Linus
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