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

David Hildenbrand
2019-09-09T10:57:23Z

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@mediatek.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