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Message-Id: <1300362011-8653-1-git-send-email-segoon@openwall.com> Date: Thu, 17 Mar 2011 14:40:10 +0300 From: Vasiliy Kulikov <segoon@...nwall.com> To: linux-kernel@...r.kernel.org Cc: security@...nel.org, "David S. Miller" <davem@...emloft.net>, Phil Blundell <philb@....org>, Eric Dumazet <eric.dumazet@...il.com>, Tejun Heo <tj@...nel.org>, Nelson Elhage <nelhage@...lice.com>, netdev@...r.kernel.org 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 <segoon@...nwall.com> --- 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); -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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