linux-kernel - [PATCH v2] ARM: pxa: sharpsl_param.c: fix invalid memory access

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Message-Id: <1379281637-26854-1-git-send-email-andrea.adami@gmail.com>
Date:	Sun, 15 Sep 2013 23:47:17 +0200
From:	Andrea Adami <andrea.adami@...il.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Marko Katic <dromede@...il.com>, Eric Miao <eric.y.miao@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] ARM: pxa: sharpsl_param.c: fix invalid memory access

After commit 72662e01088394577be4a3f14da94cf87bea2591
ARM: head.S: only include __turn_mmu_on in the initial identity mapping

Zaurus PXA devices call sharpsl_save_param() during fixup and hang on
boot because memcpy refers to physical addresses no longer valid if the
MMU is setup.
Zaurus collie (SA1100) is unaffected (function is called in init_machine).

Signed-off-by: Marko Katic <dromede@...il.com>
Signed-off-by: Andrea Adami <andrea.adami@...il.com>
---
 arch/arm/common/sharpsl_param.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/arm/common/sharpsl_param.c b/arch/arm/common/sharpsl_param.c
index d56c932..ac886f2 100644
--- a/arch/arm/common/sharpsl_param.c
+++ b/arch/arm/common/sharpsl_param.c
@@ -23,9 +23,17 @@
  * them early in the boot process, then pass them to the appropriate drivers.
  * Not all devices use all parameters but the format is common to all.
  */
+
+/* NOTE:
+ * Zaurus PXA devices call sharpsl_save_param() during fixup so we need
+ * to translate the physical address.
+ * Zaurus collie (SA1100) is unaffected (function is called in init_machine).
+ */
+
 #ifdef CONFIG_ARCH_SA1100
 #define PARAM_BASE	0xe8ffc000
 #else
+#include <asm/memory.h>
 #define PARAM_BASE	0xa0000a00
 #endif
 #define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 )  | ( b << 8 ) | a )
@@ -41,7 +49,12 @@ EXPORT_SYMBOL(sharpsl_param);
 
 void sharpsl_save_param(void)
 {
-	memcpy(&sharpsl_param, (void *)PARAM_BASE, sizeof(struct sharpsl_param_info));
+#ifdef CONFIG_ARCH_SA1100
+	void *param_start = (void *)PARAM_BASE;
+#else
+	void *param_start = phys_to_virt(PARAM_BASE);
+#endif
+	memcpy(&sharpsl_param, param_start, sizeof(struct sharpsl_param_info));
 
 	if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
 		sharpsl_param.comadj=-1;
@@ -58,5 +71,3 @@ void sharpsl_save_param(void)
 	if (sharpsl_param.adadj_keyword != AD_MAGIC)
 		sharpsl_param.adadj=-1;
 }
-
-
-- 
1.8.1.5

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