linux-kernel - Re: [patch 3/3] [PATCH] prctl: Add PR_SET_MM codes to set up mm

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Date:	Mon, 12 Dec 2011 12:38:58 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrew Vagin <avagin@...nvz.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [patch 3/3] [PATCH] prctl: Add PR_SET_MM codes to set up
 mm_struct entires v3

On Mon, Dec 12, 2011 at 12:06 PM, Cyrill Gorcunov <gorcunov@...nvz.org> wrote:
> When we restore a task we need to set up text, data and data
> heap sizes from userspace to the values a task had at
> checkpoint time. This patch adds auxilary prctl codes for that.
> ...
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>

Looks good; I like having this wrapped in CONFIG_CHECKPOINT_RESTORE.

> +#ifdef CONFIG_CHECKPOINT_RESTORE
> +static int prctl_set_mm(int opt, unsigned long addr,
> +                       unsigned long arg4, unsigned long arg5)
> ...
> +#else /* CONFIG_CHECKPOINT_RESTORE */
> +static int prctl_set_mm(int opt, unsigned long addr)

These need to have matching argument lists.

Reviewed-by: Kees Cook <keescook@...omium.org>


-Kees

-- 
Kees Cook
ChromeOS Security
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