--- zzzz-none-000/linux-4.9.218/drivers/gpio/gpiolib-sysfs.c	2020-04-02 15:20:41.000000000 +0000
+++ seale-7590ax-750/linux-4.9.218/drivers/gpio/gpiolib-sysfs.c	2023-03-29 10:59:06.000000000 +0000
@@ -446,6 +446,9 @@
 	struct gpio_desc	*desc;
 	int			status;
 
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
 	status = kstrtol(buf, 0, &gpio);
 	if (status < 0)
 		goto done;
@@ -488,6 +491,9 @@
 	struct gpio_desc	*desc;
 	int			status;
 
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
 	status = kstrtol(buf, 0, &gpio);
 	if (status < 0)
 		goto done;