net,socket: introduce DECLARE_SOCKADDR helper to catch overflow at build time
proto_ops->getname implies copying protocol specific data
into storage unit (particulary to __kernel_sockaddr_storage).
So when we implement new protocol support we should keep such
a detail in mind (which is easy to forget about).
Lets introduce DECLARE_SOCKADDR helper which check if
storage unit is not overfowed at build time.
Eventually inet_getname is switched to use DECLARE_SOCKADDR
(to show example of usage).
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 59966f1..7b3aae2 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -24,6 +24,9 @@
#include <linux/types.h> /* pid_t */
#include <linux/compiler.h> /* __user */
+#define __sockaddr_check_size(size) \
+ BUILD_BUG_ON(((size) > sizeof(struct __kernel_sockaddr_storage)))
+
#ifdef __KERNEL__
# ifdef CONFIG_PROC_FS
struct seq_file;