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 12:31:03 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Walter Wu <walter-zh.wu@...iatek.com>
Cc:     David Hildenbrand <david@...hat.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>,
        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 Tue, Sep 10, 2019 at 09:07:49AM +0800, Walter Wu wrote:
> 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.

Any patchset must be bisectable: do not break anything in the middle of
patchset.

-- 
 Kirill A. Shutemov