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Message-ID: <1568108638.24886.7.camel@mtksdccf07>
Subject: Re: [PATCH v2 1/2] mm/page_ext: support to record the last stack of
 page
From:   Walter Wu <walter-zh.wu@mediatek.com>
To:     "Kirill A. Shutemov" <kirill@shutemov.name>
CC:     David Hildenbrand <david@redhat.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        "Dmitry Vyukov" <dvyukov@google.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Will Deacon <will@kernel.org>,
        Andrey Konovalov <andreyknvl@google.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        Michal Hocko <mhocko@kernel.org>, Qian Cai <cai@lca.pw>,
        <linux-kernel@vger.kernel.org>, <kasan-dev@googlegroups.com>,
        <linux-mm@kvack.org>, <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>, <wsd_upstream@mediatek.com>
Date:   Tue, 10 Sep 2019 17:43:58 +0800
In-Reply-To: <20190910093103.4cmqk4semlhgpmle@box.shutemov.name>
References: <20190909085339.25350-1-walter-zh.wu@mediatek.com>
         <36b5a8e0-2783-4c0e-4fc7-78ea652ba475@redhat.com>
         <1568077669.24886.3.camel@mtksdccf07>
         <20190910093103.4cmqk4semlhgpmle@box.shutemov.name>
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On Tue, 2019-09-10 at 12:31 +0300, Kirill A. Shutemov wrote:
> 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@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?
> > > 
> > 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.
> 

Thanks your reminder.
I should explain complete message at commit log.
Our patchsets is below:
https://lkml.org/lkml/2019/9/9/104
https://lkml.org/lkml/2019/9/9/123