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

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Message-ID: <CACT4Y+btyLi+z09EO0JU-7AS_OfRbWiZvGn-KP9fndevh+xFNw@mail.gmail.com>
Date:   Thu, 7 Jun 2018 18:25:35 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     syzbot <syzbot+87cfa083e727a224754b@...kaller.appspotmail.com>,
        avagin <avagin@...nvz.org>, David Miller <davem@...emloft.net>,
        Ding Tianhong <dingtianhong@...wei.com>,
        Eric Dumazet <edumazet@...gle.com>,
        "Reshetova, Elena" <elena.reshetova@...el.com>,
        Jason Wang <jasowang@...hat.com>,
        KVM list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Matthew Dawson <matthew@...systems.ca>,
        Ingo Molnar <mingo@...nel.org>,
        netdev <netdev@...r.kernel.org>, Paolo Abeni <pabeni@...hat.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        virtualization@...ts.linux-foundation.org,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: KMSAN: uninit-value in _copy_to_iter (2)

On Thu, Jun 7, 2018 at 5:38 PM, Michael S. Tsirkin <mst@...hat.com> wrote:
> #syz test: https://github.com/google/kmsan.git/master d2d741e5d1898dfde1a75ea3d29a9a3e2edf0617

Hi Michael,

We need:

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

here. Please see
https://github.com/google/syzkaller/blob/master/docs/syzbot.md#testing-patches
for more info.

Please also add the Reported-by tag when mailing the patch for review.

Thanks

> 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;
>
> --
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