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

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Date:   Mon, 9 Sep 2019 16:53:39 +0800
From:   Walter Wu <walter-zh.wu@...iatek.com>
To:     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>
CC:     <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>,
        Walter Wu <walter-zh.wu@...iatek.com>
Subject: [PATCH v2 1/2] mm/page_ext: support to record the last stack of page

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;
-- 
2.18.0