linux-kernel - [PATCH] arm64: fix add kasan bug

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Date:	Thu, 31 Dec 2015 18:09:09 +0800
From:	zhongjiang <zhongjiang@...wei.com>
To:	<linux-kernel@...r.kernel.org>, <ryabinin.a.a@...il.com>,
	<linux-mm@...ck.org>, <catalin.marinas@....com>,
	<akpm@...ux-foundation.org>
CC:	<qiuxishi@...wei.com>, <zhongjiang@...wei.com>,
	<long.wanglong@...wei.com>
Subject: [PATCH] arm64: fix add kasan bug

From: zhong jiang <zhongjiang@...wei.com>

In general, each process have 16kb stack space to use, but
stack need extra space to store red_zone when kasan enable.
the patch fix above question.

Signed-off-by: zhong jiang <zhongjiang@...wei.com>
---
 arch/arm64/include/asm/thread_info.h | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 90c7ff2..45b5a7e 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -23,13 +23,24 @@
 
 #include <linux/compiler.h>
 
+#ifdef CONFIG_KASAN
+#define KASAN_STACK_ORDER 1
+#else
+#define KASAN_STACK_ORDER 0
+#endif
+
 #ifdef CONFIG_ARM64_4K_PAGES
-#define THREAD_SIZE_ORDER	2
+#define THREAD_SIZE_ORDER	(2 + KASAN_STACK_ORDER)
 #elif defined(CONFIG_ARM64_16K_PAGES)
-#define THREAD_SIZE_ORDER	0
+#define THREAD_SIZE_ORDER	(0 + KASAN_STACK_ORDER)
 #endif
 
+#ifdef CONFIG_KASAN
+#define THREAD_SIZE		32768
+#else
 #define THREAD_SIZE		16384
+#endif
+
 #define THREAD_START_SP		(THREAD_SIZE - 16)
 
 #ifndef __ASSEMBLY__
-- 
2.0.0

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