linux-kernel - Re: [PATCH v2 1/2] mm/page_ext: support to record the last stack of page

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Date:   Mon, 9 Sep 2019 12:57:03 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Walter Wu <walter-zh.wu@...iatek.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Will Deacon <will@...nel.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michal Hocko <mhocko@...nel.org>, Qian Cai <cai@....pw>
Cc:     linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wsd_upstream@...iatek.com
Subject: Re: [PATCH v2 1/2] mm/page_ext: support to record the last stack of
 page

On 09.09.19 10:53, Walter Wu wrote:
> KASAN will record last stack of page in order to help programmer
> to see memory corruption caused by page.
> 
> What is difference between page_owner and our patch?
> page_owner records alloc stack of page, but our patch is to record
> last stack(it may be alloc or free stack of page).
> 
> Signed-off-by: Walter Wu <walter-zh.wu@...iatek.com>
> ---
>  mm/page_ext.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/mm/page_ext.c b/mm/page_ext.c
> index 5f5769c7db3b..7ca33dcd9ffa 100644
> --- a/mm/page_ext.c
> +++ b/mm/page_ext.c
> @@ -65,6 +65,9 @@ static struct page_ext_operations *page_ext_ops[] = {
>  #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
>  	&page_idle_ops,
>  #endif
> +#ifdef CONFIG_KASAN
> +	&page_stack_ops,
> +#endif
>  };
>  
>  static unsigned long total_usage;
> 

Are you sure this patch compiles?

t460s: ~/git/linux virtio-mem $ git grep page_stack_ops
t460s: ~/git/linux virtio-mem $

-- 

Thanks,

David / dhildenb