Re: [patch 1/2] c/r: prctl: Add ability to set newmm_struct::exe_file

[Cyrill Gorcunov]

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.

	Cyrill
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