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

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Message-ID: <alpine.DEB.2.00.1202140906500.20013@router.home>
Date:	Tue, 14 Feb 2012 09:07:44 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Yang Bai <hamo.by@...il.com>, 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, 14 Feb 2012, Andrew Morton 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.

Well there is WARN_ON_ONCE too to prevent that.

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