linux-kernel - Re: [patch 4/4] c/r: prctl: Extend PR_SET_MM to set up more mm

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Message-ID: <CAGXu5jKsFoMS4XgfOQBZYabrD_5BJAyaXn=5tW9xFd4GuBXTQg@mail.gmail.com>
Date:	Fri, 3 Feb 2012 08:56:20 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Tejun Heo <tj@...nel.org>, Andrew Vagin <avagin@...nvz.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [patch 4/4] c/r: prctl: Extend PR_SET_MM to set up more mm_struct entries

On Fri, Feb 3, 2012 at 7:19 AM, Cyrill Gorcunov <gorcunov@...nvz.org> wrote:
> +       case PR_SET_MM_AUXV: {
> +               unsigned long user_auxv[AT_VECTOR_SIZE];
> +
> +               if (arg4 > sizeof(mm->saved_auxv))
> +                       goto out;

While these are both AT_VECTOR_SIZE, I think it might be better to use
sizeof(mm->saved_auxv) instead of AT_VECTOR_SIZE, just so that they
can never get out sync and there's a single reference for the size.

-Kees

-- 
Kees Cook
ChromeOS Security
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