Re: [PATCH] mm: slub: Fix slab walking for init_on_free

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To: Laura Abbott <labbott@xxxxxxxxxx>
Subject: Re: [PATCH] mm: slub: Fix slab walking for init_on_free
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Wed, 31 Jul 2019 12:35:09 -0700
Cc: Alexander Potapenko <glider@xxxxxxxxxx>, kernel test robot <rong.a.chen@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxx>, Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>, "Serge E. Hallyn" <serge@xxxxxxxxxx>, Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Kostya Serebryany <kcc@xxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Sandeep Patil <sspatil@xxxxxxxxxxx>, Randy Dunlap <rdunlap@xxxxxxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Marco Elver <elver@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, LKP <lkp@xxxxxx>, linux-mm@xxxxxxxxx
In-reply-to: <20190731193240.29477-1-labbott@redhat.com>
References: <CAG_fn=VBGE=YvkZX0C45qu29zqfvLMP10w_owj4vfFxPcK5iow@mail.gmail.com> <20190731193240.29477-1-labbott@redhat.com>
User-agent: Mutt/1.11.4 (2019-03-13)

On Wed, Jul 31, 2019 at 03:32:40PM -0400, Laura Abbott wrote:
> Fix this by ensuring the value we set with set_freepointer is either NULL
> or another value in the chain.
> 
> Reported-by: kernel test robot <rong.a.chen@xxxxxxxxx>
> Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>

Fixes: 6471384af2a6 ("mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options")

Follow-Ups:
- Re: [PATCH] mm: slub: Fix slab walking for init_on_free
  - From: Kees Cook

References:
- [PATCH] mm: slub: Fix slab walking for init_on_free
  - From: Laura Abbott

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