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From:   Walter Wu <walter-zh.wu@mediatek.com>
To:     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>
CC:     <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>,
        Walter Wu <walter-zh.wu@mediatek.com>
Subject: [PATCH v2 1/2] mm/page_ext: support to record the last stack of page
Date:   Mon, 9 Sep 2019 16:53:39 +0800
Message-ID: <20190909085339.25350-1-walter-zh.wu@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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