patches.socfpga/0103-nios2-use-generic-strncpy_from_user-and-strnlen_user.patch

From 1e114cbc9496ee8376e0ad899890a1eff7e58230 Mon Sep 17 00:00:00 2001
From: Ley Foon Tan <ley.foon.tan@intel.com>
Date: Mon, 8 May 2017 17:14:14 +0800
Subject: [PATCH 103/103] nios2: use generic strncpy_from_user() and
 strnlen_user()

This change enables the generic strncpy_from_user() and strnlen_user()

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
---
 arch/nios2/Kconfig               |    2 ++
 arch/nios2/include/asm/uaccess.h |    7 +++++--
 arch/nios2/mm/uaccess.c          |   33 ---------------------------------
 3 files changed, 7 insertions(+), 35 deletions(-)

--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -6,6 +6,8 @@ config NIOS2
 	select GENERIC_CPU_DEVICES
 	select GENERIC_IRQ_PROBE
 	select GENERIC_IRQ_SHOW
+	select GENERIC_STRNCPY_FROM_USER
+	select GENERIC_STRNLEN_USER
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARCH_KGDB
 	select IRQ_DOMAIN
--- a/arch/nios2/include/asm/uaccess.h
+++ b/arch/nios2/include/asm/uaccess.h
@@ -64,6 +64,8 @@ extern int fixup_exception(struct pt_reg
 
 # define __EX_TABLE_SECTION	".section __ex_table,\"a\"\n"
 
+#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE)
+
 /*
  * Zero Userspace
  */
@@ -103,8 +105,9 @@ raw_copy_to_user(void __user *to, const
 #define INLINE_COPY_TO_USER
 
 extern long strncpy_from_user(char *__to, const char __user *__from,
-				long __len);
-extern long strnlen_user(const char __user *s, long n);
+			      long __len);
+extern __must_check long strlen_user(const char __user *str);
+extern __must_check long strnlen_user(const char __user *s, long n);
 
 /* Optimized macros */
 #define __get_user_asm(val, insn, addr, err)				\
--- a/arch/nios2/mm/uaccess.c
+++ b/arch/nios2/mm/uaccess.c
@@ -128,36 +128,3 @@ asm(
 	".word 12b,13b\n"
 	".previous\n");
 EXPORT_SYMBOL(raw_copy_to_user);
-
-long strncpy_from_user(char *__to, const char __user *__from, long __len)
-{
-	int l = strnlen_user(__from, __len);
-	int is_zt = 1;
-
-	if (l > __len) {
-		is_zt = 0;
-		l = __len;
-	}
-
-	if (l == 0 || copy_from_user(__to, __from, l))
-		return -EFAULT;
-
-	if (is_zt)
-		l--;
-	return l;
-}
-
-long strnlen_user(const char __user *s, long n)
-{
-	long i;
-
-	for (i = 0; i < n; i++) {
-		char c;
-
-		if (get_user(c, s + i) == -EFAULT)
-			return 0;
-		if (c == 0)
-			return i + 1;
-	}
-	return n + 1;
-}