microblaze: uaccess: Sync strlen, strnlen, copy_to/from_user

Last sync.

Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 32 insertions, 56 deletions

diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
index b33ab659781e..446bec29b142 100644
--- a/arch/microblaze/include/asm/uaccess.h
+++ b/arch/microblaze/include/asm/uaccess.h
@@ -294,40 +294,6 @@ extern long __user_bad(void);
 
 #define put_user(x, ptr)        __put_user((x), (ptr))
 
-static inline long strnlen_user(const char __user *src, long count)
-{
-        return strlen(src) + 1;
-}
-
-#define __do_strncpy_from_user(dst, src, count, res)                    \
-        do {                                                            \
-                char *tmp;                                              \
-                strncpy(dst, src, count);                               \
-                for (tmp = dst; *tmp && count > 0; tmp++, count--)      \
-                        ;                                               \
-                res = (tmp - dst);                                      \
-        } while (0)
-
-static inline long __strncpy_from_user(char *dst,
-                                const char __user *src, long count)
-{
-        long res;
-        __do_strncpy_from_user(dst, src, count, res);
-        return res;
-}
-
-static inline long strncpy_from_user(char *dst,
-                                const char __user *src, long count)
-{
-        long res = -EFAULT;
-        if (access_ok(VERIFY_READ, src, 1))
-                __do_strncpy_from_user(dst, src, count, res);
-        return res;
-}
-
-extern long strncpy_from_user(char *dst, const char *src, long count);
-extern long strnlen_user(const char *src, long count);
-
 #else /* CONFIG_MMU */
 
 #define put_user(x, ptr)                                                \
@@ -335,26 +301,9 @@ extern long strnlen_user(const char *src, long count);
         access_ok(VERIFY_WRITE, (ptr), sizeof(*(ptr)))                  \
                 ? __put_user((x), (ptr)) : -EFAULT;                     \
 })
-
-extern int __strncpy_user(char *to, const char __user *from, int len);
-
-#define __strncpy_from_user     __strncpy_user
-
-static inline long
-strncpy_from_user(char *dst, const char __user *src, long count)
-{
-        if (!access_ok(VERIFY_READ, src, 1))
-                return -EFAULT;
-        return __strncpy_from_user(dst, src, count);
-}
-
-extern int __strnlen_user(const char __user *sstr, int len);
-
-#define strnlen_user(str, len)  \
-                (access_ok(VERIFY_READ, str, 1) ? __strnlen_user(str, len) : 0)
-
 #endif /* CONFIG_MMU */
 
+/* copy_to_from_user */
 #define __copy_from_user(to, from, n)   \
         __copy_tofrom_user((__force void __user *)(to), \
                                 (void __user *)(from), (n))
@@ -367,8 +316,7 @@ static inline long copy_from_user(void *to,
         might_sleep();
         if (access_ok(VERIFY_READ, from, n))
                 return __copy_from_user(to, from, n);
-        else
-                return n;
+        return n;
 }
 
 #define __copy_to_user(to, from, n)     \
@@ -382,8 +330,36 @@ static inline long copy_to_user(void __user *to,
         might_sleep();
         if (access_ok(VERIFY_WRITE, to, n))
                 return __copy_to_user(to, from, n);
-        else
-                return n;
+        return n;
+}
+
+/*
+ * Copy a null terminated string from userspace.
+ */
+extern int __strncpy_user(char *to, const char __user *from, int len);
+
+#define __strncpy_from_user     __strncpy_user
+
+static inline long
+strncpy_from_user(char *dst, const char __user *src, long count)
+{
+        if (!access_ok(VERIFY_READ, src, 1))
+                return -EFAULT;
+        return __strncpy_from_user(dst, src, count);
+}
+
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 on exception, a value greater than N if too long
+ */
+extern int __strnlen_user(const char __user *sstr, int len);
+
+static inline long strnlen_user(const char __user *src, long n)
+{
+        if (!access_ok(VERIFY_READ, src, 1))
+                return 0;
+        return __strnlen_user(src, n);
 }
 
 #endif  /* __ASSEMBLY__ */