Re: [PATCH] mm/slub.c: re-randomize random_seq if necessary

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To: Peng Wang <rocking@xxxxxxxxxx>
Subject: Re: [PATCH] mm/slub.c: re-randomize random_seq if necessary
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Wed, 9 Jan 2019 04:13:52 -0800
Cc: cl@xxxxxxxxx, penberg@xxxxxxxxxx, rientjes@xxxxxxxxxx, iamjoonsoo.kim@xxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20190109090628.1695-1-rocking@whu.edu.cn>
References: <20190109090628.1695-1-rocking@whu.edu.cn>
User-agent: Mutt/1.9.2 (2017-12-15)

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?

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  - From: Peng Wang

References:
- [PATCH] mm/slub.c: re-randomize random_seq if necessary
  - From: Peng Wang

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