openwrt_packages/luci-app-ramfree/root/usr/share/rpcd/acl.d/luci-app-ramfree.json

{
	"luci-app-ramfree": {
		"description": "Grant UCI access for luci-app-ramfree",
		"read": {
			"file": {
				"/bin/sync": [ "exec" ],
				"/sbin/sysctl": [ "exec" ]
			}
		}
	}
}