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

[Christoph Lameter]

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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