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From: "Michael S. Tsirkin" <mst@redhat.com>
To: syzbot <syzbot+87cfa083e727a224754b@syzkaller.appspotmail.com>
Cc: avagin@openvz.org, davem@davemloft.net, dingtianhong@huawei.com,
	edumazet@google.com, elena.reshetova@intel.com,
	jasowang@redhat.com, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, matthew@mjdsystems.ca,
	mingo@kernel.org, netdev@vger.kernel.org, pabeni@redhat.com,
	syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk,
	virtualization@lists.linux-foundation.org, willemb@google.com
Subject: Re: KMSAN: uninit-value in _copy_to_iter (2)
Date: Thu, 7 Jun 2018 20:10:01 +0300	[thread overview]
Message-ID: <20180607183629-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <000000000000cf4578056ab12452@google.com>

#syz test: https://github.com/google/kmsan.git master

Subject: vhost: fix info leak

Fixes: CVE-2018-1118
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index f0be5f35ab28..9beefa6ed1ce 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -2345,6 +2345,9 @@ struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type)
 	struct vhost_msg_node *node = kmalloc(sizeof *node, GFP_KERNEL);
 	if (!node)
 		return NULL;
+
+	/* Make sure all padding within the structure is initialized. */
+	memset(&node->msg, 0, sizeof node->msg);
 	node->vq = vq;
 	node->msg.type = type;
 	return node;

  parent reply	other threads:[~2018-06-07 17:10 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-23 16:56 syzbot
2018-04-25 19:19 ` syzbot
2018-06-07 15:38   ` Michael S. Tsirkin
2018-06-07 15:38     ` syzbot
2018-06-07 16:25     ` Dmitry Vyukov
2018-06-07 17:04       ` syzbot
2018-06-07 17:43     ` Al Viro
2018-06-07 17:59       ` Michael S. Tsirkin
2018-06-07 18:04         ` Al Viro
2018-06-07 19:29           ` Michael S. Tsirkin
2018-06-07 17:10   ` Michael S. Tsirkin [this message]
2018-06-07 17:31     ` syzbot
2018-04-27 15:45 ` [PATCH net] vhost: Use kzalloc() to allocate vhost_msg_node Kevin Easton
2018-04-27 16:05   ` Michael S. Tsirkin
2018-04-27 16:11     ` Dmitry Vyukov
2018-04-27 16:15       ` Michael S. Tsirkin
2018-04-27 16:25         ` Dmitry Vyukov
2018-04-27 16:29           ` Dmitry Vyukov
2018-04-27 19:36       ` Michael S. Tsirkin
2018-04-29  8:10         ` Dmitry Vyukov
2018-04-28  1:07     ` Kevin Easton
2018-04-28  1:51       ` Kevin Easton
2018-04-28  2:23         ` Jason Wang
2018-05-07 13:03   ` Michael S. Tsirkin
2018-05-07 13:12     ` Dmitry Vyukov
2018-05-08  8:27     ` Kevin Easton
2018-05-29 22:19   ` [net] " Guenter Roeck
2018-05-30  3:01     ` Michael S. Tsirkin
2018-05-30  3:42       ` Guenter Roeck
2018-06-04 12:34       ` Dmitry Vyukov

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