linux-kernel - [PATCH v9 09/17] kmemleak: disable kasan instrumentation for kmemleak

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Message-id: <1421859105-25253-10-git-send-email-a.ryabinin@samsung.com>
Date:	Wed, 21 Jan 2015 19:51:37 +0300
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-mm@...ck.org, Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH v9 09/17] kmemleak: disable kasan instrumentation for kmemleak

kmalloc internally round up allocation size, and kmemleak
uses rounded up size as object's size. This makes kasan
to complain while kmemleak scans memory or calculates of object's
checksum. The simplest solution here is to disable kasan.

Signed-off-by: Andrey Ryabinin <a.ryabinin@...sung.com>
Acked-by: Catalin Marinas <catalin.marinas@....com>
---
 mm/kmemleak.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 3cda50c..9bda1b3 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -98,6 +98,7 @@
 #include <asm/processor.h>
 #include <linux/atomic.h>
 
+#include <linux/kasan.h>
 #include <linux/kmemcheck.h>
 #include <linux/kmemleak.h>
 #include <linux/memory_hotplug.h>
@@ -1113,7 +1114,10 @@ static bool update_checksum(struct kmemleak_object *object)
 	if (!kmemcheck_is_obj_initialized(object->pointer, object->size))
 		return false;
 
+	kasan_disable_local();
 	object->checksum = crc32(0, (void *)object->pointer, object->size);
+	kasan_enable_local();
+
 	return object->checksum != old_csum;
 }
 
@@ -1164,7 +1168,9 @@ static void scan_block(void *_start, void *_end,
 						  BYTES_PER_POINTER))
 			continue;
 
+		kasan_disable_local();
 		pointer = *ptr;
+		kasan_enable_local();
 
 		object = find_and_get_object(pointer, 1);
 		if (!object)
-- 
2.2.1

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