linux-kernel - Re: compat: autofs v5 packet size ambiguity

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Message-ID: <CA+55aFwkYkSC1O=fWtj1CBAeKDP-ogEL4Mai8U-dd2uCMArppw@mail.gmail.com>
Date:	Wed, 22 Feb 2012 08:12:45 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ian Kent <raven@...maw.net>
Cc:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, autofs@...r.kernel.org,
	Thomas Meyer <thomas@...3r.de>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: compat: autofs v5 packet size ambiguity - update

On Wed, Feb 22, 2012 at 1:32 AM, Ian Kent <raven@...maw.net> wrote:
>
> Oh, DOH ...
>
> The process mounting the autofs mount is passing the pipe it will use
> for communication via a mount option so we can do this right in
> fill_super.

No, we really cannot.

The autofs "mount" is done by fork + execve("mount").

So fill_super doesn't actually see the *daemon*. It sees the mount binary.

So if you have a 64-bit mount binary, and a 32-bit daemon, you're screwed again.

                     Linus
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