econet information leak https://bugzilla.redhat.com/show_bug.cgi?id=591815#c14
>From 67c5c6cb8129c595f21e88254a3fc6b3b841ae8e Mon Sep 17 00:00:00 2001 From: Vasiliy Kulikov <[email protected]> Date: Thu, 17 Mar 2011 01:40:10 +0000 Subject: [PATCH] econet: 4 byte infoleak to the network
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 <[email protected]> Acked-by: Phil Blundell <[email protected]> Signed-off-by: David S. Miller <[email protected]> --- net/econet/af_econet.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) 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); -- 1.7.4.2
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