linux-kernel - Re: Re: KMSAN: uninit-value in _copy_to

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Message-ID: <0000000000009b46ec056e0f1460@google.com>
Date:   Thu, 07 Jun 2018 08:38:52 -0700
From:   syzbot <syzbot+87cfa083e727a224754b@...kaller.appspotmail.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     avagin@...nvz.org, davem@...emloft.net, dingtianhong@...wei.com,
        edumazet@...gle.com, elena.reshetova@...el.com,
        jasowang@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, matthew@...systems.ca,
        mingo@...nel.org, mst@...hat.com, netdev@...r.kernel.org,
        pabeni@...hat.com, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk, virtualization@...ts.linux-foundation.org,
        willemb@...gle.com
Subject: Re: Re: KMSAN: uninit-value in _copy_to_iter (2)

> #syz test: https://github.com/google/kmsan.git/master  
> d2d741e5d1898dfde1a75ea3d29a9a3e2edf0617

"https://github.com/google/kmsan.git/master" does not look like a valid git  
repo address.


> Subject: vhost: fix info leak

> Fixes: CVE-2018-1118
> Signed-off-by: Michael S. Tsirkin <mst@...hat.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;