From b6f686f2014ae2b104909bec7b8ed73a2d77c8fd Mon Sep 17 00:00:00 2001
From: Tao Zeng <tao.zeng@amlogic.com>
Date: Thu, 16 May 2019 17:28:29 +0800
Subject: [PATCH] kasan: change address layout [3/3]

PD#SWPL-8572

Problem:
In change http://scgit.amlogic.com:8080/#/c/73995/ we have changed
memory layout of vmalloc. Which caused kasan can't be used

Solution:
change kasan address layout

Verify:
x301

Change-Id: I28aee4b1d9b622dd884e6c2d6b621aa870cd8586
Signed-off-by: Tao Zeng <tao.zeng@amlogic.com>
---
 arch/arm/Kconfig              |  1 -
 arch/arm/Makefile             |  2 +-
 arch/arm/include/asm/kasan.h  | 19 +++++++++++--------
 arch/arm/include/asm/memory.h |  8 ++++----
 4 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a55b22a..da92f87 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1433,7 +1433,6 @@ choice
 		bool "3G/1G user/kernel split"
 	config VMSPLIT_3G_OPT
 		bool "3G/1G user/kernel split (for full 1G low memory)"
-		depends on !AMLOGIC_KASAN32
 	config VMSPLIT_2G
 		bool "2G/2G user/kernel split"
 	config VMSPLIT_1G
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 4a1ada2..62732af 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -53,7 +53,7 @@ LD		+= -EL
 endif
 
 ifeq ($(CONFIG_KASAN),y)
-KASAN_SHADOW_OFFSET := 0x99000000
+KASAN_SHADOW_OFFSET := 0xA0000000
 endif
 
 #
diff --git a/arch/arm/include/asm/kasan.h b/arch/arm/include/asm/kasan.h
index 1bff547..af3d4da 100644
--- a/arch/arm/include/asm/kasan.h
+++ b/arch/arm/include/asm/kasan.h
@@ -20,16 +20,18 @@
  *  0x00000000 +--------+
  *             |        |
  *             |        |
- *             |        |  User space memory,         2816MB
+ *             |        |  User space memory,         2944MB
  *             |        |
  *             |        |
- *  0xb0000000 +--------+
- *             |        |  Kasan shaddow memory,       144MB
- *  0xb9000000 +--------+
- *             |        |  Vmalloc address,            356MB
+ *  0xb8000000 +--------+
+ *             |        |  Kasan shaddow memory,       128MB
+ *  0xc0000000 +--------+
+ *             |        |
+ *             |        |  Vmalloc address,            240MB
+ *             |        |
  *  0xCF400000 +--------+
  *  0xCF600000 +--------+  PKmap, for kmap               2MB
- *  0xD0000000 +--------+  Modul                        10MB
+ *  0xD0000000 +--------+  Module and pkmap,            10MB
  *             |        |
  *             |        |  Kernel linear mapped space, 762MB
  *             |        |
@@ -39,7 +41,8 @@
  *  0xFFFF0000 +--------+  High vector,                  4KB
  *
  */
-#define KASAN_SHADOW_SIZE	(0x09000000)
+#define KADDR_SIZE		(SZ_1G)
+#define KASAN_SHADOW_SIZE	(KADDR_SIZE >> 3)
 #define KASAN_SHADOW_START	(TASK_SIZE)
 #define KASAN_SHADOW_END	(KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
 
@@ -49,7 +52,7 @@
  *     shadow_addr = (address >> 3) + KASAN_SHADOW_OFFSET;
  *
  */
-#define KASAN_SHADOW_OFFSET	0x99000000UL
+#define KASAN_SHADOW_OFFSET	(KASAN_SHADOW_START - (VMALLOC_START >> 3))
 struct map_desc;
 void kasan_init(void);
 void kasan_copy_shadow(pgd_t *pgdir);
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 1e81f57..60c66ab 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -41,11 +41,11 @@
 #ifdef CONFIG_AMLOGIC_KASAN32
 /*
  * if open AMLOGIC_KASAN32, PAGE_OFFSET is set to 0xD0000000
- * we config 0xB0000000 as shadow memory start. so vmalloc
- * can be 0xb9000000 and total 368mb space for vmalloc
+ * we config 0xB8000000 as shadow memory start. so vmalloc
+ * can be 0xC0000000 and total 256mb space for vmalloc
  */
-#define VMALLOC_START		(UL(0xB9000000))
-#define TASK_SIZE		(UL(0xB0000000))
+#define VMALLOC_START		(UL(CONFIG_PAGE_OFFSET) - UL(SZ_256M))
+#define TASK_SIZE		(VMALLOC_START - UL(SZ_128M))
 #define KMEM_END		(0xffa00000UL)
 #else /* CONFIG_AMLOGIC_KASAN32 */
 #define TASK_SIZE		(UL(CONFIG_PAGE_OFFSET) - UL(SZ_64M))
-- 
2.7.4