1 files changed, 48 insertions, 0 deletions
diff --git a/arch/powerpc/lib/checksum_wrappers.c b/arch/powerpc/lib/checksum_wrappers.c
new file mode 100644
index 000000000..b895166af
--- /dev/null
+++ b/arch/powerpc/lib/checksum_wrappers.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * Copyright (C) IBM Corporation, 2010
+ *
+ * Author: Anton Blanchard <anton@au.ibm.com>
+ */
+#include <linux/export.h>
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <asm/checksum.h>
+#include <linux/uaccess.h>
+
+__wsum csum_and_copy_from_user(const void __user *src, void *dst,
+			       int len)
+{
+	__wsum csum;
+
+	might_sleep();
+
+	if (unlikely(!access_ok(src, len)))
+		return 0;
+
+	allow_read_from_user(src, len);
+
+	csum = csum_partial_copy_generic((void __force *)src, dst, len);
+
+	prevent_read_from_user(src, len);
+	return csum;
+}
+EXPORT_SYMBOL(csum_and_copy_from_user);
+
+__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len)
+{
+	__wsum csum;
+
+	might_sleep();
+	if (unlikely(!access_ok(dst, len)))
+		return 0;
+
+	allow_write_to_user(dst, len);
+
+	csum = csum_partial_copy_generic(src, (void __force *)dst, len);
+
+	prevent_write_to_user(dst, len);
+	return csum;
+}
+EXPORT_SYMBOL(csum_and_copy_to_user);