linux-kernel - Re: [PATCH] slab: warning if total alloc size overflow

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Message-ID: <CAO_0yfOjstSnhqf_DBBr7-it48GyUObF2=4GeMd7TDo_TPaLPg@mail.gmail.com>
Date:	Tue, 14 Feb 2012 17:43:17 +0800
From:	Yang Bai <hamo.by@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	cl@...ux-foundation.org, penberg@...nel.org, mpm@...enic.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] slab: warning if total alloc size overflow

On Tue, Feb 14, 2012 at 4:53 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Tue, 14 Feb 2012 15:28:19 +0800 Yang Bai <hamo.by@...il.com> wrote:
>
>
> One of the applications of kcalloc() is to prevent userspace from
> causing a multiplicative overflow (and then perhaps causing an
> overwrite beyond the end of the allocated memory).
>
> With this patch, we've just handed the user a way of spamming the logs
> at 1MHz.  This is bad.
>
>
> Also, please let's not randomly add debug stuff in places where we've
> never demonstrated a need for it.

Ok. Please just drop this patch.

Thanks.

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