linux-kernel - Re: [PATCH v2 16/33] mm: slub: Let KMSAN access metadata

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Date:   Thu, 30 Nov 2023 16:26:14 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Ilya Leoshkevich <iii@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Marco Elver <elver@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Pekka Enberg <penberg@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Vasily Gorbik <gor@...ux.ibm.com>
Cc:     Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-s390@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Sven Schnelle <svens@...ux.ibm.com>
Subject: Re: [PATCH v2 16/33] mm: slub: Let KMSAN access metadata

On 11/21/23 23:01, Ilya Leoshkevich wrote:
> Building the kernel with CONFIG_SLUB_DEBUG and CONFIG_KMSAN causes
> KMSAN to complain about touching redzones in kfree().
> 
> Fix by extending the existing KASAN-related metadata_access_enable()
> and metadata_access_disable() functions to KMSAN.
> 
> Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  mm/slub.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index 169e5f645ea8..6e61c27951a4 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -700,10 +700,12 @@ static int disable_higher_order_debug;
>  static inline void metadata_access_enable(void)
>  {
>  	kasan_disable_current();
> +	kmsan_disable_current();
>  }
>  
>  static inline void metadata_access_disable(void)
>  {
> +	kmsan_enable_current();
>  	kasan_enable_current();
>  }
>