From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: [PATCHv10 man-pages 5/5] execveat.2: initial man page for
 execveat(2)
Date: Sun, 11 Jan 2015 03:02:56 -0800
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Cc: Rich Felker <dalias-/miJ2pyFWUyWIDz0JBNUog@public.gmane.org>, Al Viro <viro-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>, David Drysdale <drysdale-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, "Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>, Meredydd Luff <meredydd-zPN50pYk8eUaUu29zAJCuw@public.gmane.org>, "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>, Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>, Stephen Rothwell <sfr-3FnU+UHB4dNDw9hX6IcOSA@public.gmane.org>, Oleg Nesterov <oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>, Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>, Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>, X86 ML <x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, linux-arch <linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, sparclinux-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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On Sat, Jan 10, 2015 at 08:09:10PM -0600, Eric W. Biederman wrote:
> In implementation /proc/self/exe is a named rather than a numbered file
> descriptor.  Essentially when loading an elf executable the file
> descriptor is duped to the name /proc/self/exe.  The implementation
> otherwise is the same as /proc/self/fd/N.
> 
> The downside of course is that I expect if we were actually to change
> /proc/self/exe from to point at the script instead of the shell some
> piece of software somewhere would come melting down.  I am totally not
> ready to consider that kind of mine field today.

We could add a /proc/self/script that points to the script, and either
is not available or still points to the executable if we are not running
a script.