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Message-ID: <20120323064136.GA6766@moon>
Date: Fri, 23 Mar 2012 10:41:36 +0400
From: Cyrill Gorcunov <gorcunov@...nvz.org>
To: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
richard -rw- weinberger <richard.weinberger@...il.com>,
LKML <linux-kernel@...r.kernel.org>,
Oleg Nesterov <oleg@...hat.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Pavel Emelyanov <xemul@...allels.com>,
Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
Matt Helsley <matthltc@...ibm.com>
Subject: Re: [patch 1/2] c/r: prctl: Add ability to set new
mm_struct::exe_file
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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