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

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Date:   Tue, 10 Sep 2019 09:07:49 +0800
From:   Walter Wu <walter-zh.wu@...iatek.com>
To:     David Hildenbrand <david@...hat.com>
CC:     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>,
        <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 Mon, 2019-09-09 at 12:57 +0200, David Hildenbrand wrote:
> 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?
> 
This is patchsets, it need another patch2.
We have verified it by running KASAN UT on Qemu.