From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Fri, 18 Nov 2005 14:22:03 +0000 (+0000)
Subject: [ARM] Fix get_user when passed a const pointer
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d2c5b69099ff747f9757da2416383b9a999171b1;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

[ARM] Fix get_user when passed a const pointer

Unfortunately, later gcc versions error out when our get_user is passed
a const pointer, since we write to a temporary variable declared as
typeof(*(p)) which propagates the const-ness.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c
index 7a3261f0bf7..9997098009a 100644
--- a/arch/arm/kernel/armksyms.c
+++ b/arch/arm/kernel/armksyms.c
@@ -120,7 +120,6 @@ EXPORT_SYMBOL(__arch_strncpy_from_user);
 EXPORT_SYMBOL(__get_user_1);
 EXPORT_SYMBOL(__get_user_2);
 EXPORT_SYMBOL(__get_user_4);
-EXPORT_SYMBOL(__get_user_8);
 
 EXPORT_SYMBOL(__put_user_1);
 EXPORT_SYMBOL(__put_user_2);
diff --git a/arch/arm/lib/getuser.S b/arch/arm/lib/getuser.S
index d204018070a..c03ea8e666b 100644
--- a/arch/arm/lib/getuser.S
+++ b/arch/arm/lib/getuser.S
@@ -54,15 +54,6 @@ __get_user_4:
 	mov	r0, #0
 	mov	pc, lr
 
-	.global	__get_user_8
-__get_user_8:
-5:	ldrt	r2, [r0], #4
-6:	ldrt	r3, [r0]
-	mov	r0, #0
-	mov	pc, lr
-
-__get_user_bad_8:
-	mov	r3, #0
 __get_user_bad:
 	mov	r2, #0
 	mov	r0, #-EFAULT
@@ -73,6 +64,4 @@ __get_user_bad:
 	.long	2b, __get_user_bad
 	.long	3b, __get_user_bad
 	.long	4b, __get_user_bad
-	.long	5b, __get_user_bad_8
-	.long	6b, __get_user_bad_8
 .previous
diff --git a/include/asm-arm/uaccess.h b/include/asm-arm/uaccess.h
index a2fdad0138b..064f0f5e8e2 100644
--- a/include/asm-arm/uaccess.h
+++ b/include/asm-arm/uaccess.h
@@ -100,7 +100,6 @@ static inline void set_fs (mm_segment_t fs)
 extern int __get_user_1(void *);
 extern int __get_user_2(void *);
 extern int __get_user_4(void *);
-extern int __get_user_8(void *);
 extern int __get_user_bad(void);
 
 #define __get_user_x(__r2,__p,__e,__s,__i...)				\
@@ -114,7 +113,7 @@ extern int __get_user_bad(void);
 #define get_user(x,p)							\
 	({								\
 		const register typeof(*(p)) __user *__p asm("r0") = (p);\
-		register typeof(*(p)) __r2 asm("r2");			\
+		register unsigned int __r2 asm("r2");			\
 		register int __e asm("r0");				\
 		switch (sizeof(*(__p))) {				\
 		case 1:							\
@@ -126,12 +125,9 @@ extern int __get_user_bad(void);
 		case 4:							\
 	       		__get_user_x(__r2, __p, __e, 4, "lr");		\
 			break;						\
-		case 8:							\
-			__get_user_x(__r2, __p, __e, 8, "lr");		\
-	       		break;						\
 		default: __e = __get_user_bad(); break;			\
 		}							\
-		x = __r2;						\
+		x = (typeof(*(p))) __r2;				\
 		__e;							\
 	})