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

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Date:	Sat, 5 Mar 2011 12:52:34 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
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

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.

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

So I suspect you need two of those annoying #ifdef's. Or we need to
have some way to guarantee that 'compat_uptr_t' exists.

                           Linus
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