linux-kernel - Re: [PATCH v3] mm/kasan: dump alloc and free stack for page allocator

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Date:   Thu, 12 Sep 2019 22:08:28 +0800
From:   Walter Wu <walter-zh.wu@...iatek.com>
To:     Vlastimil Babka <vbabka@...e.cz>
CC:     Qian Cai <cai@....pw>, 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>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        "Arnd Bergmann" <arnd@...db.de>, <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 v3] mm/kasan: dump alloc and free stack for page
 allocator


>  extern void __reset_page_owner(struct page *page, unsigned int order);
> diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> index 6c9682ce0254..dc560c7562e8 100644
> --- a/lib/Kconfig.kasan
> +++ b/lib/Kconfig.kasan
> @@ -41,6 +41,8 @@ config KASAN_GENERIC
>  	select SLUB_DEBUG if SLUB
>  	select CONSTRUCTORS
>  	select STACKDEPOT
> +	select PAGE_OWNER
> +	select PAGE_OWNER_FREE_STACK
>  	help
>  	  Enables generic KASAN mode.
>  	  Supported in both GCC and Clang. With GCC it requires version 4.9.2
> @@ -63,6 +65,8 @@ config KASAN_SW_TAGS
>  	select SLUB_DEBUG if SLUB
>  	select CONSTRUCTORS
>  	select STACKDEPOT
> +	select PAGE_OWNER
> +	select PAGE_OWNER_FREE_STACK
>  	help

What is the difference between PAGE_OWNER+PAGE_OWNER_FREE_STACK and
DEBUG_PAGEALLOC?
If you directly enable PAGE_OWNER+PAGE_OWNER_FREE_STACK
PAGE_OWNER_FREE_STACK,don't you think low-memory device to want to use
KASAN?