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Date:	Fri, 23 Mar 2012 10:41:36 +0400
From:	Cyrill Gorcunov <>
To:	"Eric W. Biederman" <>
Cc:	Andrew Morton <>,
	richard -rw- weinberger <>,
	LKML <>,
	Oleg Nesterov <>,
	KOSAKI Motohiro <>,
	Pavel Emelyanov <>,
	Kees Cook <>, Tejun Heo <>,
	Matt Helsley <>
Subject: Re: [patch 1/2] c/r: prctl: Add ability to set new

On Thu, Mar 22, 2012 at 04:38:43PM -0700, Eric W. Biederman wrote:
> >
> > Andrew, take a look please, will the changelog and comments look
> > better?
> Can you change this to take an actual address and get the exe_file
> from an mmapped area and make certain that the mmaped_area is already
> mapped MAP_EXEC.
> That will prevent out-right lies.
> At least then we will know that exe_file will at least be a file that is
> mapped executable in the process's address space.  It's not a lot better
> but it makes /proc/<pid>/exe at almost as trustable as it is now.

This won't work for all cases. When we restore a program we map new
VM_EXEC areas _without_ vma::vm_file field.

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