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From: Vasiliy Kulikov <segoon-cxoSlKxDwOJWk0Htik3J/w@public.gmane.org>
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: security-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	Marcel Holtmann <marcel-kz+m5ild9QBg9hUCZPvPmw@public.gmane.org>,
	"Gustavo F. Padovan"
	<padovan-Y3ZbgMPKUGA34EUeqzHoZw@public.gmane.org>,
	"David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
	Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	linux-bluetooth-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH] bluetooth: bnep: fix buffer overflow
Date: Mon, 14 Feb 2011 13:54:31 +0300	[thread overview]
Message-ID: <1297680871-11617-1-git-send-email-segoon@openwall.com> (raw)

Struct ca is copied from userspace.  It is not checked whether the "device"
field is NULL terminated.  This potentially leads to BUG() inside of
alloc_netdev_mqs() and/or information leak by creating a device with a name
made of contents of kernel stack.

Signed-off-by: Vasiliy Kulikov <segoon-cxoSlKxDwOJWk0Htik3J/w@public.gmane.org>
---
 Compile tested.

 net/bluetooth/bnep/sock.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/net/bluetooth/bnep/sock.c b/net/bluetooth/bnep/sock.c
index 2862f53..30faaf1 100644
--- a/net/bluetooth/bnep/sock.c
+++ b/net/bluetooth/bnep/sock.c
@@ -88,6 +88,7 @@ static int bnep_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long
 			sockfd_put(nsock);
 			return -EBADFD;
 		}
+		ca.device[sizeof(ca.device)-1] = 0;
 
 		err = bnep_add_connection(&ca, nsock);
 		if (!err) {
-- 
1.7.0.4

             reply	other threads:[~2011-02-14 10:54 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-14 10:54 Vasiliy Kulikov [this message]
2011-02-14 14:35 ` [PATCH] bluetooth: bnep: fix buffer overflow Gustavo F. Padovan

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