From 5b67027b143216d6ee37ae5bf730cedcf2f9a719 Mon Sep 17 00:00:00 2001 From: Vasiliy Kulikov Date: Thu, 17 Mar 2011 01:40:10 +0000 Subject: [PATCH] econet: 4 byte infoleak to the network BugLink: http://bugs.launchpad.net/bugs/761134 commit 67c5c6cb8129c595f21e88254a3fc6b3b841ae8e upstream. struct aunhdr has 4 padding bytes between 'pad' and 'handle' fields on x86_64. These bytes are not initialized in the variable 'ah' before sending 'ah' to the network. This leads to 4 bytes kernel stack infoleak. This bug was introduced before the git epoch. Signed-off-by: Vasiliy Kulikov Acked-by: Phil Blundell Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman Signed-off-by: Tim Gardner --- net/econet/af_econet.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/econet/af_econet.c b/net/econet/af_econet.c index 0c28263..116d3fd 100644 --- a/net/econet/af_econet.c +++ b/net/econet/af_econet.c @@ -435,10 +435,10 @@ static int econet_sendmsg(struct kiocb *iocb, struct socket *sock, udpdest.sin_addr.s_addr = htonl(network | addr.station); } + memset(&ah, 0, sizeof(ah)); ah.port = port; ah.cb = cb & 0x7f; ah.code = 2; /* magic */ - ah.pad = 0; /* tack our header on the front of the iovec */ size = sizeof(struct aunhdr); -- 1.7.10.4