[RFC PATCH v1 6/9] uaccess: Change copy_{to/from}_user to return -EFAULT

["Christophe Leroy (CS GROUP)" <chleroy@kernel.org>]

Now that copy_{to/from}_user_partial() are used by callers which expect
partial copy with number of not copied bytes as return value, change
copy_{to/from}_user() to return an int, and return -EFAULT when the
copy is not complete.

Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
---
 include/linux/uaccess.h | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 2d37173782b3..33b7d0f5f808 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -211,7 +211,7 @@ extern __must_check unsigned long
 _copy_to_user(void __user *, const void *, unsigned long);
 
 static __always_inline unsigned long __must_check
-copy_from_user(void *to, const void __user *from, unsigned long n)
+copy_from_user_common(void *to, const void __user *from, unsigned long n, bool partial)
 {
 	if (!check_copy_size(to, n, false))
 		return n;
@@ -221,10 +221,20 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
 		return _inline_copy_from_user(to, from, n);
 }
 
-#define copy_from_user_partial copy_from_user
+static __always_inline unsigned long __must_check
+copy_from_user_partial(void *to, const void __user *from, unsigned long n)
+{
+	return copy_from_user_common(to, from, n, true);
+}
+
+static __always_inline int __must_check
+copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	return copy_from_user_common(to, from, n, false) ? -EFAULT : 0;
+}
 
 static __always_inline unsigned long __must_check
-copy_to_user(void __user *to, const void *from, unsigned long n)
+copy_to_user_common(void __user *to, const void *from, unsigned long n, bool partial)
 {
 	if (!check_copy_size(from, n, true))
 		return n;
@@ -235,7 +245,17 @@ copy_to_user(void __user *to, const void *from, unsigned long n)
 		return _inline_copy_to_user(to, from, n);
 }
 
-#define copy_to_user_partial copy_to_user
+static __always_inline unsigned long __must_check
+copy_to_user_partial(void __user *to, const void *from, unsigned long n)
+{
+	return copy_to_user_common(to, from, n, true);
+}
+
+static __always_inline int __must_check
+copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	return copy_to_user_common(to, from, n, false) ? -EFAULT : 0;
+}
 
 #ifndef copy_mc_to_kernel
 /*
-- 
2.49.0