[ruby-core:58640] Re: [ruby-trunk - Bug #9124] TestSocket errors in test-all on Arch 64-bit

This looks to be a problem of Linux 3.12 and later

	commit 1661bf364ae9c506bc8795fef70d1532931be1e8
	Author: Dan Carpenter <[e-mail]>
	Date:   Thu Oct 3 00:27:20 2013 +0300

	    net: heap overflow in __audit_sockaddr()

I'm inclined to believe Ruby is incorrect for using a gigantic
placeholder value.

Ruby started using a gigantic buffer since r39529 (so no stable releases).

    * ext/socket/rubysocket.h (union_sockaddr): make it longer for SunOS
      and Darwin.

The following is a dirty workaround, but I don't think it's sufficient
since SunOS and Darwin could be affected by the same heap overflow in
which was in Linux.

--- a/ext/socket/rubysocket.h
+++ b/ext/socket/rubysocket.h
@@ -194,7 +194,9 @@ typedef union {
   struct sockaddr_dl dl; /* AF_LINK */
 #endif
   struct sockaddr_storage storage;
+#ifndef __linux__
   char place_holder[2048]; /* sockaddr_storage is not enough for Unix domain sockets on SunOS and Darwin. */
+#endif
 } union_sockaddr;
 
 #ifdef __APPLE__