linux-kernel - Re: [PATCH v3 1/4] exec: introduce get_arg

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Message-Id: <20110303114952.B94B.A69D9226@jp.fujitsu.com>
Date:	Thu,  3 Mar 2011 12:01:18 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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 v3 1/4] exec: introduce get_arg_ptr() helper

Hi

Sorry for the long delay. now I'm getting stuck sucky paper work. ;-)
In short, I don't find any issue in this patch. So, I'll test it at
this weekend if linus haven't merged it yet.

A few small and cosmetic comments are below. but anyway I don't want
keep this up in the air.
	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>



> Introduce get_arg_ptr() helper, convert count() and copy_strings()
> to use it.
> 
> No functional changes, preparation. This helper is trivial, it just
> reads the pointer from argv/envp user-space array.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
> 
>  fs/exec.c |   36 +++++++++++++++++++++++++-----------
>  1 file changed, 25 insertions(+), 11 deletions(-)
> 
> --- 38/fs/exec.c~1_get_arg_ptr	2011-03-02 15:15:27.000000000 +0100
> +++ 38/fs/exec.c	2011-03-02 15:16:44.000000000 +0100
> @@ -395,6 +395,17 @@ err:
>  	return err;
>  }
>  
> +static const char __user *
> +get_arg_ptr(const char __user * const __user *argv, int argc)
> +{

[argc, argv] is natural order to me than [argv, argc].
and "get_" prefix are usually used for reference count incrementing
function in linux. so, i _personally_ prefer to call "user_arg_ptr".



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