linux-kernel - Re: [PATCH 3.5] c/r: prctl: less paranoid prctl_set_mm_exe

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Message-ID: <20120616090108.GC32029@moon>
Date:	Sat, 16 Jun 2012 13:01:08 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>,
	linux-mm@...ck.org, Matt Helsley <matthltc@...ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 3.5] c/r: prctl: less paranoid prctl_set_mm_exe_file()

On Sat, Jun 16, 2012 at 12:51:04PM +0400, Konstantin Khlebnikov wrote:
> "no other files mapped" requirement from my previous patch
> (c/r: prctl: update prctl_set_mm_exe_file() after mm->num_exe_file_vmas removal)
> is too paranoid, it forbids operation even if there mapped one shared-anon vma.
> 
> Let's check that current mm->exe_file already unmapped, in this case exe_file
> symlink already outdated and its changing is reasonable.
> 
> Plus, this patch fixes exit code in case operation success.
> 
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
> Reported-by: Cyrill Gorcunov <gorcunov@...nvz.org>

Thanks, Konstantin, letme test it out...

	Cyrill
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