1 files changed, 33 insertions, 0 deletions
diff --git a/lib/usercopy.c b/lib/usercopy.c
new file mode 100644
index 000000000..3744b2a8e
--- /dev/null
+++ b/lib/usercopy.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/uaccess.h>
+
+/* out-of-line parts */
+
+#ifndef INLINE_COPY_FROM_USER
+unsigned long _copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	unsigned long res = n;
+	might_fault();
+	if (likely(access_ok(VERIFY_READ, from, n))) {
+		kasan_check_write(to, n);
+		res = raw_copy_from_user(to, from, n);
+	}
+	if (unlikely(res))
+		memset(to + (n - res), 0, res);
+	return res;
+}
+EXPORT_SYMBOL(_copy_from_user);
+#endif
+
+#ifndef INLINE_COPY_TO_USER
+unsigned long _copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	might_fault();
+	if (likely(access_ok(VERIFY_WRITE, to, n))) {
+		kasan_check_read(from, n);
+		n = raw_copy_to_user(to, from, n);
+	}
+	return n;
+}
+EXPORT_SYMBOL(_copy_to_user);
+#endif