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net,socket: introduce DECLARE_SOCKADDR helper to catch overflow at build time

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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>
This commit is contained in:
Cyrill Gorcunov 2009-10-29 02:59:18 -07:00 • committed by David S. Miller
parent ed3f2e40f3
commit 38bfd8f5be
3 changed files with 7 additions and 1 deletions
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3
include/linux/socket.h
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@ -24,6 +24,9 @@ struct __kernel_sockaddr_storage {
#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;