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Date: Tue, 13 Jan 2015 14:41:20 -0500
From: Chris Metcalf <cmetcalf@...hip.com>
To: <linux-kernel@...r.kernel.org>
CC: Arnd Bergmann <arnd@...db.de>, <linux-arch@...r.kernel.org>,
"Michael S. Tsirkin" <mst@...hat.com>
Subject: [PATCH 2/2] tile: enable sparse checks for get/put_user
Add an extra intermediate variable to __get_user and __put_user
to give sparse an opportunity to detect mismatches.
Signed-off-by: Chris Metcalf <cmetcalf@...hip.com>
---
arch/tile/include/asm/uaccess.h | 19 +++++++++++--------
1 file changed, 11 insertions(+), 8 deletions(-)
diff --git a/arch/tile/include/asm/uaccess.h b/arch/tile/include/asm/uaccess.h
index b81b24a8489b..f41cb53cf645 100644
--- a/arch/tile/include/asm/uaccess.h
+++ b/arch/tile/include/asm/uaccess.h
@@ -210,14 +210,16 @@ extern int __get_user_bad(void)
#define __get_user(x, ptr) \
({ \
int __ret; \
+ typeof(x) _x; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
- case 1: __get_user_1(x, ptr, __ret); break; \
- case 2: __get_user_2(x, ptr, __ret); break; \
- case 4: __get_user_4(x, ptr, __ret); break; \
- case 8: __get_user_8(x, ptr, __ret); break; \
+ case 1: __get_user_1(_x, ptr, __ret); break; \
+ case 2: __get_user_2(_x, ptr, __ret); break; \
+ case 4: __get_user_4(_x, ptr, __ret); break; \
+ case 8: __get_user_8(_x, ptr, __ret); break; \
default: __ret = __get_user_bad(); break; \
} \
+ (x) = (typeof(*(ptr))) _x; \
__ret; \
})
@@ -289,12 +291,13 @@ extern int __put_user_bad(void)
#define __put_user(x, ptr) \
({ \
int __ret; \
+ typeof(*(ptr)) _x = (x); \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
- case 1: __put_user_1(x, ptr, __ret); break; \
- case 2: __put_user_2(x, ptr, __ret); break; \
- case 4: __put_user_4(x, ptr, __ret); break; \
- case 8: __put_user_8(x, ptr, __ret); break; \
+ case 1: __put_user_1(_x, ptr, __ret); break; \
+ case 2: __put_user_2(_x, ptr, __ret); break; \
+ case 4: __put_user_4(_x, ptr, __ret); break; \
+ case 8: __put_user_8(_x, ptr, __ret); break; \
default: __ret = __put_user_bad(); break; \
} \
__ret; \
--
2.1.2
--
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