linux-kernel - Re: [PATCH] mm/slub.c: re-randomize random

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Message-ID: <20190109121352.GI6310@bombadil.infradead.org>
Date:   Wed, 9 Jan 2019 04:13:52 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Peng Wang <rocking@....edu.cn>
Cc:     cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/slub.c: re-randomize random_seq if necessary

On Wed, Jan 09, 2019 at 05:06:27PM +0800, Peng Wang wrote:
> calculate_sizes() could be called in several places
> like (red_zone/poison/order/store_user)_store() while
> random_seq remains unchanged.
> 
> If random_seq is not NULL in calculate_sizes(), re-randomize it.

Why do we want to re-randomise the slab at these points?