* [PATCH v2 1/2] mm/page_ext: support to record the last stack of page
@ 2019-09-09 8:53 Walter Wu
2019-09-09 10:57 ` David Hildenbrand
2019-09-09 12:59 ` Vlastimil Babka
0 siblings, 2 replies; 6+ messages in thread
From: Walter Wu @ 2019-09-09 8:53 UTC (permalink / raw)
To: Andrey Ryabinin, Alexander Potapenko, Dmitry Vyukov,
Matthias Brugger, Andrew Morton, Martin Schwidefsky, Will Deacon,
Andrey Konovalov, Arnd Bergmann, Thomas Gleixner, Michal Hocko,
Qian Cai
Cc: linux-kernel, kasan-dev, linux-mm, linux-arm-kernel,
linux-mediatek, wsd_upstream, Walter Wu
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;
--
2.18.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2 1/2] mm/page_ext: support to record the last stack of page
2019-09-09 8:53 [PATCH v2 1/2] mm/page_ext: support to record the last stack of page Walter Wu
@ 2019-09-09 10:57 ` David Hildenbrand
2019-09-10 1:07 ` Walter Wu
2019-09-09 12:59 ` Vlastimil Babka
1 sibling, 1 reply; 6+ messages in thread
From: David Hildenbrand @ 2019-09-09 10:57 UTC (permalink / raw)
To: Walter Wu, Andrey Ryabinin, Alexander Potapenko, Dmitry Vyukov,
Matthias Brugger, Andrew Morton, Martin Schwidefsky, Will Deacon,
Andrey Konovalov, Arnd Bergmann, Thomas Gleixner, Michal Hocko,
Qian Cai
Cc: linux-kernel, kasan-dev, linux-mm, linux-arm-kernel,
linux-mediatek, wsd_upstream
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
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 1/2] mm/page_ext: support to record the last stack of page
2019-09-09 8:53 [PATCH v2 1/2] mm/page_ext: support to record the last stack of page Walter Wu
2019-09-09 10:57 ` David Hildenbrand
@ 2019-09-09 12:59 ` Vlastimil Babka
1 sibling, 0 replies; 6+ messages in thread
From: Vlastimil Babka @ 2019-09-09 12:59 UTC (permalink / raw)
To: Walter Wu, Andrey Ryabinin, Alexander Potapenko, Dmitry Vyukov,
Matthias Brugger, Andrew Morton, Martin Schwidefsky, Will Deacon,
Andrey Konovalov, Arnd Bergmann, Thomas Gleixner, Michal Hocko,
Qian Cai
Cc: linux-kernel, kasan-dev, linux-mm, linux-arm-kernel,
linux-mediatek, wsd_upstream
On 9/9/19 10:53 AM, 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>
There's no point in separating this from patch 2 (and as David pointed
out, doesn't compile).
> ---
> 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;
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 1/2] mm/page_ext: support to record the last stack of page
2019-09-09 10:57 ` David Hildenbrand
@ 2019-09-10 1:07 ` Walter Wu
2019-09-10 9:31 ` Kirill A. Shutemov
0 siblings, 1 reply; 6+ messages in thread
From: Walter Wu @ 2019-09-10 1:07 UTC (permalink / raw)
To: David Hildenbrand
Cc: Andrey Ryabinin, Alexander Potapenko, Dmitry Vyukov,
Matthias Brugger, Andrew Morton, Martin Schwidefsky, Will Deacon,
Andrey Konovalov, Arnd Bergmann, Thomas Gleixner, Michal Hocko,
Qian Cai, linux-kernel, kasan-dev, linux-mm, linux-arm-kernel,
linux-mediatek, wsd_upstream
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.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 1/2] mm/page_ext: support to record the last stack of page
2019-09-10 1:07 ` Walter Wu
@ 2019-09-10 9:31 ` Kirill A. Shutemov
2019-09-10 9:43 ` Walter Wu
0 siblings, 1 reply; 6+ messages in thread
From: Kirill A. Shutemov @ 2019-09-10 9:31 UTC (permalink / raw)
To: Walter Wu
Cc: David Hildenbrand, Andrey Ryabinin, Alexander Potapenko,
Dmitry Vyukov, Matthias Brugger, Andrew Morton,
Martin Schwidefsky, Will Deacon, Andrey Konovalov, Arnd Bergmann,
Thomas Gleixner, Michal Hocko, Qian Cai, linux-kernel, kasan-dev,
linux-mm, linux-arm-kernel, linux-mediatek, wsd_upstream
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.
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 1/2] mm/page_ext: support to record the last stack of page
2019-09-10 9:31 ` Kirill A. Shutemov
@ 2019-09-10 9:43 ` Walter Wu
0 siblings, 0 replies; 6+ messages in thread
From: Walter Wu @ 2019-09-10 9:43 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: David Hildenbrand, Andrey Ryabinin, Alexander Potapenko,
Dmitry Vyukov, Matthias Brugger, Andrew Morton,
Martin Schwidefsky, Will Deacon, Andrey Konovalov, Arnd Bergmann,
Thomas Gleixner, Michal Hocko, Qian Cai, linux-kernel, kasan-dev,
linux-mm, linux-arm-kernel, linux-mediatek, wsd_upstream
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
^ permalink raw reply [flat|nested] 6+ messages in thread
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2019-09-09 8:53 [PATCH v2 1/2] mm/page_ext: support to record the last stack of page Walter Wu
2019-09-09 10:57 ` David Hildenbrand
2019-09-10 1:07 ` Walter Wu
2019-09-10 9:31 ` Kirill A. Shutemov
2019-09-10 9:43 ` Walter Wu
2019-09-09 12:59 ` Vlastimil Babka
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