linux-kernel - Re: mpol_to

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Message-ID: <CAHGf_=pr1AYeWZhaC2MKN-XjiWB7=hs92V0sH-zVw3i00X-e=A@mail.gmail.com>
Date:	Mon, 15 Oct 2012 22:34:53 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	bhutchings@...arflare.com, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: mpol_to_str revisited.

On Mon, Oct 8, 2012 at 11:09 AM, Dave Jones <davej@...hat.com> wrote:
> Last month I sent in 80de7c3138ee9fd86a98696fd2cf7ad89b995d0a to remove
> a user triggerable BUG in mempolicy.
>
> Ben Hutchings pointed out to me that my change introduced a potential leak
> of stack contents to userspace, because none of the callers check the return value.
>
> This patch adds the missing return checking, and also clears the buffer beforehand.

I don't think 80de7c3138ee9fd86a98696fd2cf7ad89b995d0a is right fix. we should
close a race (or kill remain ref count leak) if we still have.
Because of, this patch makes unstable /proc output and might lead to
userland confusing.
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