linux-kernel - Re: [PATCH v4 3/4] exec: unify do_execve/compat_do

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Message-ID: <20110305212051.GA9937@redhat.com>
Date:	Sat, 5 Mar 2011 22:20:51 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, pageexec@...email.hu,
	Solar Designer <solar@...nwall.com>,
	Eugene Teo <eteo@...hat.com>,
	Brad Spengler <spender@...ecurity.net>,
	Roland McGrath <roland@...hat.com>,
	Milton Miller <miltonm@....com>
Subject: Re: [PATCH v4 3/4] exec: unify do_execve/compat_do_execve code

On 03/05, Linus Torvalds wrote:
>
> Ok, everything looks fine to me.
>
> Except looking at this, I don't think this part:
>
> On Sat, Mar 5, 2011 at 12:31 PM, Oleg Nesterov <oleg@...hat.com> wrote:
> >
> >  struct user_arg_ptr {
> > -       const char __user *const __user *native;
> > +#ifdef CONFIG_COMPAT
> > +       bool is_compat;
> > +#endif
> > +       union {
> > +               const char __user *const __user *native;
> > +               compat_uptr_t __user *compat;
> > +       } ptr;
> >  };
>
> will necessarily even compile on an architecture that doesn't have any
> 'compat' support.

Aaaaaaaaaaaaaaaaaah, now this is a really good point.

> Do we even define 'compat_uptr_t' for that case? I don't think so.

Indeed, you are right.

What I was thinking about? I do not know.

> So I suspect you need two of those annoying #ifdef's.

please expect v5 tomorrow.

Oleg.

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